List of Java inspections

Arquillian

Inspection name	Default state	Default severity
Arquillian test class should be properly prepared	Enabled	Error
Arquillian test class should have method with @Deployment annotation	Enabled	Error
Arquillian test class should have only one method with @Deployment annotation	Enabled	Error
Wrong return type of @Deployment method	Enabled	Error
Wrong signature of @Deployment method	Enabled	Error

Abstraction issues

Inspection name	Default state	Default severity
Cast to a concrete class	Disabled	Warning
Chain of instanceof checks	Disabled	Warning
Class references one of its subclasses	Disabled	Warning
Feature envy	Disabled	Warning
instanceof a concrete class	Disabled	Warning
instanceof check for this	Disabled	Warning
Interface method clashes with method in java.lang.Object	Enabled	Warning
Local variable of concrete class	Disabled	Warning
Magic number	Disabled	Warning
Method parameter to concrete class	Disabled	Warning
Method return of concrete class	Disabled	Warning
Optional used as field or parameter type	Enabled	Warning
Overly strong type cast	Disabled	Warning
Private method only used from inner class	Disabled	Warning
public method not exposed in interface	Disabled	Warning
public method with boolean parameter	Disabled	Warning
Static field of concrete class	Disabled	Warning
Static member used only from one other class	Disabled	Warning
Type may be weakened	Disabled	Warning
Type of instance field is concrete class	Disabled	Warning

Assignment issues

Inspection name	Default state	Default severity
Assignment replaceable with operator assignment	Disabled	Warning
Assignment to for loop parameter	Disabled	Warning
Assignment to catch block parameter	Disabled	Warning
Assignment to lambda parameter	Disabled	Warning
Assignment to method parameter	Disabled	Warning
Assignment to static field from instance context	Disabled	Warning
Assignment used as condition	Disabled	Warning
Constructor assigns value to field defined in superclass	Disabled	Warning
null assignment	Disabled	Warning
Results of assignment used	Disabled	Warning
Value of ++ or -- used	Disabled	Warning

Bitwise operation issues

Inspection name	Default state	Default severity
Incompatible bitwise mask operation	Enabled	Warning
Pointless bitwise expression	Enabled	Warning
Shift operation by inappropriate constant	Enabled	Warning

Class metrics

Inspection name	Default state	Default severity
Anonymous inner class with too many methods	Disabled	Warning
Class too deep in inheritance tree	Disabled	Warning
Class with too many constructors	Disabled	Warning
Class with too many fields	Disabled	Warning
Class with too many methods	Disabled	Warning
Inner class too deeply nested	Disabled	Warning
Overly complex anonymous class	Disabled	Warning
Overly complex class	Disabled	Warning
Overly coupled class	Disabled	Warning

Class structure

Inspection name	Default state	Default severity
Abstract class may be interface	Enabled	No highlighting, only fix
Anonymous inner class	Disabled	Warning
Class may extend adapter instead of implementing listener	Disabled	Warning
Class name differs from file name	Disabled	Warning
Class with only private constructors should be declared final	Disabled	Warning
Constant declared in abstract class	Disabled	Warning
Constant declared in interface	Disabled	Warning
Empty class	Disabled	Warning
Field can be local	Enabled	Warning
final class	Disabled	Warning
final method	Disabled	Warning
final method in final class	Disabled	Warning
Inner class of interface	Disabled	Warning
Interface may be annotated @FunctionalInterface	Disabled	Warning
Limited-scope inner class	Disabled	Warning
Marker interface	Disabled	Warning
Method returns per-class constant	Disabled	Warning
Multiple top level classes in single file	Disabled	Warning
Non-op method in abstract class	Disabled	Warning
Non- final field in enum	Disabled	Warning
Non- static initializer	Disabled	Warning
Parameter can be local	Enabled	Warning
private method declared final	Enabled	Warning
private method in final class	Disabled	Warning
public constructor	Disabled	Warning
public constructor in non-public class	Disabled	Warning
Singleton	Disabled	Warning
static, non- final field	Disabled	Warning
static method declared final	Enabled	Warning
Utility class	Disabled	Warning
Utility class can be enum	Disabled	Warning
Utility class is not final	Disabled	Warning
Utility class with public constructor	Disabled	Warning
Utility class without public constructor	Disabled	Warning

Inspections labeled with are not available in the editor and can be launched via Code | Inspect Code or Code | Analyze Code | Run Inspection By Name....

Cloning issues

Inspection name	Default state	Default severity
clone() does not declare CloneNotSupportedException	Enabled	Warning
clone() instantiates objects with constructor	Disabled	Warning
clone() method in non-Cloneabe class	Disabled	Warning
clone() method in non-Cloneabe class	Disabled	Warning
clone() method not public	Disabled	Warning
clone() should have return type equal to the class it contains	Disabled	Warning
Cloneable class without clone() method	Disabled	Warning
Use of clone() Cloneable	Disabled	Warning

Code maturity

Inspection name	Default state	Default severity
Call to printStackTrace()	Disabled	Warning
Call to Thread.dumpStack()	Disabled	Warning
Deprecated API usage	Enabled	Warning
Deprecated method is still used	Enabled	Warning
Inspection suppression annotation	Disabled	Warning
Throwable printed to System.out	Enabled	Warning
Usage of API marked for removal	Enabled	Error
Use of obsolete collection type	Disabled	Warning
Use of obsolete date-time API	Disabled	Warning
Use of System.out or System.err	Disabled	Warning

Code style issues

Inspection name	Default state	Default severity
Array can be replaced with enum values	Enabled	No highlighting, only fix
Array creation without new expression	Enabled	No highlighting, only fix
assert message is not a String	Disabled	Warning
Assignment can be joined with declaration	Enabled	No highlighting, only fix
Block marker comment	Disabled	Warning
C-style array declaration	Enabled	Warning
Call to String.concat() can be replaced with +	Disabled	Warning
Can use bounded wildcard	Disabled	Warning
Chained equality comparisons	Disabled	Warning
Chained method calls	Disabled	Warning
Class explicitly extends java.lang.Object	Enabled	Warning
Code block contains single statement	Enabled	No highlighting, only fix
Conditional can be replaced with Optional	Enabled	No highlighting, only fix
Confusing octal escape sequence	Disabled	Warning
Constant expression can be evaluated	Enabled	No highlighting, only fix
Constant on the wrong side of comparison	Disabled	Warning
Control flow statement without braces	Enabled	No highlighting, only fix
Diamond can be replaced with explicit type arguments	Enabled	No highlighting, only fix
equals() called on Enum value	Disabled	Warning
expression.equals("literal") rather than "literal".equals(expression)	Disabled	Warning
Field assignment can be moved to initializer	Enabled	No highlighting, only fix
Field can be Final	Disabled	Warning
If statement can be replaced with ?:, && or || expression	Enabled	No highlighting, only fix
Implicit call to super()	Disabled	Warning
Instance field access not qualified with this	Disabled	Warning
Instance field access not qualified with this	Disabled	Warning
Labeled switch rule can have code block	Enabled	No highlighting, only fix
Labeled switch rule has redundant code block	Enabled	Warning
Lambda body can be code block	Enabled	No highlighting, only fix
Lambda can be replaced with anonymous class	Enabled	No highlighting, only fix
Lambda parameter type can be specified	Enabled	No highlighting, only fix
'List.indexOf()' expression is replaceable with contains()	Disabled	Warning
Local variable or parameter can be final	Disabled	Warning
Method reference can be replaced with lambda	Enabled	No highlighting, only fix
Missorted modifiers	Disabled	Warning
Multi-catch can be split into separate catch blocks	Enabled	No highlighting, only fix
Multiple variables in one declaration	Enabled	No highlighting, only fix
Nested method call	Disabled	Warning
Null value for Optional type	Enabled	Warning
Objects.equals() can be replaced with equals()	Enabled	No highlighting, only fix
Optional can be replaced with sequence of if statements	Enabled	No highlighting, only fix
Optional contains array or collection	Disabled	Warning
Optional.isPresent() can be replaced with functional-style expression	Enabled	Warning
Raw type can be generic	Enabled	No highlighting, only fix
Redundant new expression in constant array creation	Disabled	Warning
Redundant field initialization	Disabled	Warning
Redundant interface declaration	Disabled	Warning
Redundant no-arg constructor	Disabled	Warning
return separated from the result computation	Enabled	No highlighting, only fix
Return of this	Disabled	Warning
Simplifiable annotation	Disabled	Warning
Single-element annotation	Enabled	No highlighting, only fix
size() == 0 replaceable with isEmpty()	Disabled	Warning
Standard Charset object can be used	Enabled	Warning
Stream API call chain can be replaced with loop	Enabled	No highlighting, only fix
Subsequent steps can be fused into Stream API chain	Enabled	Warning
try statement with multiple resources can be split	Enabled	No highlighting, only fix
Type parameter explicitly extends java.lang.Object	Enabled	Warning
Unclear expression	Enabled	No highlighting, only fix
Unnecessarily qualified inner class access	Enabled	No highlighting, only fix
Unnecessarily qualified static access	Disabled	Warning
Unnecessarily qualified statically imported element	Disabled	Warning
Unnecessary final on local variable or parameter	Disabled	Warning
Unnecessary null check before equals() call	Disabled	Warning
Unnecessary super qualifier	Disabled	Warning
Unnecessary this qualifier	Disabled	Warning
Unnecessary call to super()	Disabled	Warning
Unnecessary call to toString()	Disabled	Warning
Unnecessary code block	Enabled	No highlighting, only fix
Unnecessary conversion to String	Enabled	Warning
Unnecessary enum modifier	Enabled	Warning
Unnecessary fully qualified name	Enabled	No highlighting, only fix
Unnecessary interface modifier	Enabled	Warning
Unnecessary parentheses	Enabled	No highlighting, only fix
Unnecessary qualifier for this or super	Disabled	Warning
Unnecessary semicolon	Enabled	Warning
Unqualified inner class access	Disabled	Warning
Unqualified static access	Disabled	Warning

Compiler issues

Inspection name	Default state	Default severity
Javac quirks	Enabled	Warning
Unchecked warning	Enabled	Warning

Concurrency annotation issues

Inspection name	Default state	Default severity
Instance member guarded by static field	Disabled	Warning
Non-final @GuardedBy field	Disabled	Warning
Non-final field in @Immutable class	Disabled	Warning
Static member guarded by instance filed or this	Disabled	Warning
Unguarded field access	Disabled	Warning
Unknown @GuardedBy field	Disabled	Warning

Control flow issues

Inspection name	Default state	Default severity
Assertion can be replaced with if statement	Enabled	No highlighting, only fix
Boolean expression could be replaced with conditional expression	Disabled	Warning
break statement with label	Disabled	Warning
break statement	Disabled	Warning
Conditional break inside infinite loop	Enabled	Warning
Conditional can be pushed inside branch expression	Enabled	No highlighting, only fix
Conditional expression (?:)	Enabled	No highlighting, only fix
Conditional expression with identical branches	Disabled	Warning
Conditional expression with negated condition	Disabled	Warning
Constant conditional expression	Enabled	Warning
continue statement with label	Disabled	Warning
continue statement	Disabled	Warning
default not last case in switch statement	Disabled	Warning
Double negation	Enabled	Warning
Duplicate condition in if statement	Enabled	Warning
Duplicate condition on && or ||	Disabled	Warning
Enum switch statement that misses case	Enabled	No highlighting, only fix
Fallthrough in switch statement	Disabled	Warning
for loop may be replaced with while loop	Enabled	No highlighting, only fix
for loop with missing components	Disabled	Warning
Idempotent loop body	Enabled	Warning
if statement could be replaced with conditional expression	Disabled	Warning
if statement with common parts	Enabled	Weak Warning
if statement with negated condition	Disabled	Warning
if statement with too many branches	Disabled	Warning
Infinite loop statement	Enabled	Warning
Labeled statement	Disabled	Warning
Local variable used and declared in different switch branches	Disabled	Warning
Loop statement that does not loop	Enabled	Warning
Loop variable not updated inside loop	Enabled	Warning
Loop with implicit termination condition	Disabled	Warning
Negated conditional expression	Disabled	Warning
Negated equality expression	Disabled	Warning
Nested switch	Disabled	Warning
Nested conditional expression	Disabled	Warning
Overly complex boolean expression	Disabled	Warning
Pointless indexOf() comparison	Disabled	Warning
Pointless boolean expression	Enabled	Warning
Redundant else	Enabled	No highlighting, only fix
Redundant if statement	Enabled	Warning
Redundant conditional expression	Enabled	Warning
Simplifiable boolean expression	Enabled	Warning
Simplifiable conditional expression	Enabled	Warning
Statement can be replaced with assert or Objects.requireNonNull	Enabled	No highlighting, only fix
switch statement	Disabled	Warning
switch statement with too few branches	Enabled	Warning
switch statement with too low of a branch density	Disabled	Warning
switch statement with too many branches	Disabled	Warning
switch statement without default branch	Enabled	No highlighting, only fix
Unnecessary null check before method call	Enabled	Warning

Data flow

Inspection name	Default state	Default severity
Boolean method is always inverted	Enabled	Warning
Boolean variable is always inverted	Disabled	Warning
Method call violates Law of Demeter	Disabled	Warning
Negatively named boolean variable	Disabled	Warning
Redundant local variable	Enabled	Warning
Reuse of local variable	Disabled	Warning
Scope of variable is too broad	Enabled	No highlighting, only fix
Use of variable whose value is known to be constant	Disabled	Warning

Declaration redundancy

Inspection name	Default state	Default severity
Access static member via instance reference	Enabled	Warning
Actual method parameter is the same constant	Enabled	Warning
Collector can be simplified	Enabled	Warning
Declaration access can be weaker	Disabled	Warning
Declaration can have final modifier	Enabled	Warning
Default annotation parameter value	Enabled	Warning
Duplicate throws	Enabled	Warning
Empty method	Enabled	Warning
Functional expression can be folded	Enabled	Warning
Method can be void	Enabled	Warning
Method returns the same value	Enabled	Warning
Null-check method is called with obviously non-null argument	Enabled	Warning
Optional call chain can be simplified	Enabled	Warning
Redundant close()	Enabled	Warning
Redundant requires statement in module-info	Enabled	Warning
Redundant throws clause	Enabled	Warning
Redundant lambda parameter types	Enabled	No highlighting, only fix
Redundant operation on empty container	Enabled	Warning
Redundant step in Stream or Optional call chain	Enabled	Warning
Stream API call chain can be simplified	Enabled	Warning
Trivial usage of functional expression	Enabled	Warning
Unnecessary module dependency	Enabled	Warning
Unused declaration	Enabled	Warning
Unused label	Enabled	Warning
Variable is assigned to itself	Enabled	Warning
Wrapper type may be primitive	Enabled	Warning

Inspections labeled with are not available in the editor and can be launched via Code | Inspect Code or Code | Analyze Code | Run Inspection By Name....

Dependency issues

Inspection name	Default state	Default severity
Class with too many dependencies	Disabled	Warning
Class with too many dependents	Disabled	Warning
Class with too many transitive dependencies	Disabled	Warning
Class with too many transitive dependents	Disabled	Warning
Cyclic class dependency	Disabled	Warning
Cyclic package dependency	Disabled	Warning
Illegal package dependencies	Enabled	Error
Suspicious package-private access	Disabled	Warning

Inspections labeled with are not available in the editor and can be launched via Code | Inspect Code or Code | Analyze Code | Run Inspection By Name....

Encapsulation

Inspection name	Default state	Default severity
Accessing a non-public field of another object	Disabled	Warning
Assignment or return of field with mutable type	Disabled	Warning
Package-visible field	Disabled	Warning
Package-visible nested class	Disabled	Warning
Protected field	Disabled	Warning
Protected nested class	Disabled	Warning
public field	Enabled	No highlighting, only fix
public nested class	Disabled	Warning

Error handling

Inspection name	Default state	Default severity
Catch block may ignore exception	Enabled	Warning
Caught exception is immediately rethrown	Enabled	Warning
Checked exception class	Disabled	Warning
Class directly extends java.lang.Throwable	Disabled	Warning
continue or break inside finally block	Enabled	Warning
Empty finally block	Enabled	Warning
Empty try block	Enabled	Warning
Exception constructor called without arguments	Disabled	Warning
finally block which cannot complete normally	Enabled	Warning
instanceof on catch parameter	Disabled	Warning
java.lang.Error not rethrown	Disabled	Warning
java.lang.ThreadDeath not rethrown	Disabled	Warning
Nested try statement	Disabled	Warning
Non-final field of exception class	Disabled	Warning
null thrown	Disabled	Warning
Overly broad catch block	Disabled	Warning
Overly broad throws clause	Disabled	Warning
Prohibited exception caught	Disabled	Warning
Prohibited exception declared	Disabled	Warning
Prohibited exception thrown	Disabled	Warning
return inside finally block	Enabled	Warning
throw caught by containing try statement	Disabled	Warning
throw inside catch block which ignores the caught exception	Disabled	Warning
throw inside finally block	Enabled	Warning
Unchecked exception class	Disabled	Warning
Unchecked exception declared in throws clause	Disabled	Warning
Unnecessary call to Throwable.initCause()	Enabled	Warning

Finalization

Inspection name	Default state	Default severity
finalize() called explicitly	Enabled	Warning
finalize() declaration	Disabled	Warning
finalize() not declared protected	Disabled	Warning

General

Inspection name	Default state	Default severity
Test-only class or method call in production code	Disabled	Warning

Imports

Inspection name	Default state	Default severity
* import	Disabled	Warning
Import from same package	Disabled	Warning
java.lang import	Disabled	Warning
Single class import	Disabled	Warning
Static import	Disabled	Warning
Unused import	Enabled	Warning

Inheritance issues

Inspection name	Default state	Default severity
Abstract class extends concrete class	Disabled	Warning
Abstract class which has no concrete subclass	Disabled	Warning
Abstract class without abstract methods	Disabled	Warning
Abstract method overrides abstract method	Disabled	Warning
Abstract method overrides concrete method	Disabled	Warning
Abstract method with missing implementations	Disabled	Warning
Class explicitly extends a Collection class	Disabled	Warning
Class extends annotation interface	Enabled	Warning
Class extends utility class	Disabled	Warning
Class may extend a commonly used base class	Enabled	No highlighting, only fix
Final declaration can't be overridden at runtime	Enabled	Error
Interface which has no concrete subclass	Disabled	Warning
Method does not call super method	Enabled	Warning
Method is identical to its super method	Disabled	Warning
Missing @Override annotation	Enabled	No highlighting, only fix
Non-varargs method overrides varargs method	Disabled	Warning
Parameter type prevents overriding	Disabled	Warning
public constructor in abstract class	Disabled	Warning
Static inheritance	Disabled	Warning
Type parameter extends final class	Disabled	Warning

Initialization

Inspection name	Default state	Default severity
Abstract method called during object construction	Disabled	Warning
Double brace initialization	Enabled	No highlighting, only fix
Instance field may not be initialized	Disabled	Warning
Instance field used before initialization	Disabled	Warning
Non-final static field is used during class initialization	Disabled	Warning
Overridable method called during object construction	Disabled	Warning
Overridden method called during object construction	Disabled	Warning
Static field may not be initialized	Disabled	Warning
Static field used before initialization	Disabled	Warning
this reference escaped in object construction	Disabled	Warning
Unsafe lazy initialization of static field	Disabled	Warning

Internationalization

Inspection name	Default state	Default severity
Absolute alignment used in AWT/Swing code	Disabled	Warning
Call to Date.toString()	Disabled	Warning
Call to String.toUpperCase() or codetoLowerCase() without a Locale	Disabled	Warning
Call to Time.toString()	Disabled	Warning
Call to Numeric toString()	Disabled	Warning
Call to suspicious String method	Disabled	Warning
Character comparison	Disabled	Warning
Duplicate string literal	Disabled	Warning
Hard coded strings	Disabled	Warning
Implicit usage of platformcodes default charset	Disabled	Warning
Incorrect string capitalization	Enabled	Warning
Instantiating a SimpleDateFormat without a Locale	Disabled	Warning
Magic character	Disabled	Warning
String concatenation	Disabled	Warning
Unnecessary unicode escape sequence	Disabled	Warning
Use of StringTokenizer	Disabled	Warning

J2ME issues

Inspection name	Default state	Default severity
Abstract class which has only one direct inheritor	Disabled	Warning
Array.length in loop condition	Disabled	Warning
Connection opened but not safely closed	Disabled	Warning
Interface which has only one direct inheritor	Disabled	Warning
Large array allocation with no OutOfMemoryError check	Disabled	Warning
Method call in loop condition	Disabled	Warning
Multiply or divide by power of two	Disabled	Warning
Overly large initializer for array of primitive type	Disabled	Warning
RecordStore opened but not safely closed	Disabled	Warning
Single character startsWith() or codeendsWith()	Disabled	Warning
Synthetic accessor call	Disabled	Warning

Java language level

Inspection name	Default state	Default severity
Annotation	Disabled	Warning
Annotation class	Disabled	Warning
assert statement	Disabled	Warning
Auto-boxing	Disabled	Warning
Auto-unboxing	Disabled	Warning
Enumerated class	Disabled	Warning
Extended for statement	Disabled	Warning
Use of assert as identifier	Disabled	Warning
Use of enum as identifier	Disabled	Warning
Varargs method	Enabled	No highlighting, only fix

Java language level migration aids

Inspection name	Default state	Default severity
compare() method can be used to compare numbers	Enabled	Warning
Enumeration can be iteration	Disabled	Warning
if replaceable with switch	Enabled	Warning
Usages of API which isn't available at the configured language level	Enabled	Error

Java 5

BigDecimal legacy method called	Disabled	Warning
Collections.EMPTY_* field access replaceable with Collections.empty*() method call	Disabled	Warning
for loop replaceable with enhanced for loop	Enabled	Warning
String.indexOf() expression is replaceable with contains()	Enabled	Warning
Method can be varargs method	Enabled	No highlighting, only fix
Raw use of parameterized class	Enabled	Warning
StringBuffer may be StringBuilder	Enabled	Warning
Unnecessary boxing	Enabled	Warning
Unnecessary unboxing	Enabled	Warning
while loop replaceable with enhanced for loop	Enabled	Warning

Java 7

equals() expression replaceable by Objects.equals() expression	Enabled	Weak Warning
Explicit type can be replaced with <>	Enabled	Warning
Identical catch branches in try statement	Enabled	Warning
Possible heap pollution from parameterized vararg type	Enabled	Warning
try finally replaceable with try with resources	Enabled	Warning

Java 8

Anonymous type can be replaced with lambda	Enabled	Warning
Anonymous type can be replaced with method reference	Enabled	Warning
Anonymous type has shorter lambda alternative	Enabled	Warning
Collections.sort() can be replaced with List.sort()	Enabled	Warning
Comparator combinator can be used	Enabled	Warning
Expression can be folded into Stream chain	Enabled	No highlighting, only fix
forEach call can be simplified	Enabled	No highlighting, only fix
Guava's functional primitives can be replaced by Java	Enabled	Warning
Lambda can be replaced with method call	Enabled	No highlighting, only fix
Lambda can be replaced with method reference	Enabled	Warning
Loop can be collapsed with Stream API	Enabled	No highlighting, only fix
Loop can be replaced with Collection.removeIf()	Enabled	Warning
Map.forEach can be used	Enabled	Warning
Pseudo functional expression using static class	Enabled	Warning
Single Map method can be used	Enabled	Warning
Statement lambda can be replaced with expression lambda	Enabled	Warning

Java 9

Dependencies on automatic modules	Enabled	Warning
Immutable collection creation can be replaced with collection factory call	Enabled	Warning
Null check can be replaced with method call	Enabled	Warning

Java 10

Local variable type can be omitted	Enabled	No highlighting, only fix
Variable type can be explicit	Enabled	No highlighting, only fix

Java 11

Files.readString() or Files.writeString() can be used	Enabled	No highlighting, only fix
String.repeat() can be used	Enabled	No highlighting, only fix

Java 13

New style switch can be replaced with old style one	Enabled	No highlighting, only fix
Statement can be replaced with enhanced switch	Enabled	Warning
Text block can be replaced with regular string literal	Enabled	No highlighting, only fix
Text block can be used	Enabled	Warning

JavaBeans issues

Inspection name	Default state	Default severity
Class without constructor	Disabled	Warning
Class without no-arg constructor	Disabled	Warning
Field has setter but no getter	Disabled	Warning
Property value set to itself	Disabled	Warning
Suspicious getter/setter	Disabled	Warning

JavaDoc

Inspection name	Default state	Default severity
<code>...</code> can be replaced with {@code ...}	Disabled	Warning
Dangling Javadoc comment	Enabled	Warning
Declaration has Javadoc problems	Enabled	Warning
Declaration has problems in Javadoc references	Enabled	Error
HTML problems in Javadoc (DocLint)	Disabled	Error
Missing package-info.java	Disabled	Warning
Missing @Deprecated annotation	Disabled	Warning
package-info.java without package statement	Disabled	Warning
package.html may be converted to package-info.java	Disabled	Warning
Unnecessary Javadoc link	Disabled	Warning
Unnecessary {@inheritDoc} Javadoc comment	Disabled	Warning

JUnit

Inspection name	Default state	Default severity
assertEquals() between objects of inconvertible types	Enabled	Warning
assertEquals() called on array	Disabled	Warning
assertEquals() may be assertSame()	Disabled	Warning
Assertion expression can be replaced with assertThat method call	Disabled	Warning
Constant JUnit assert argument	Disabled	Warning
Expected exception never thrown in test method body	Disabled	Warning
Highlight problem line in test	Enabled	Warning
JUnit test annotated with @Ignore/ @Disabled	Disabled	Warning
JUnit test method in product source	Disabled	Warning
JUnit test method without any assertions	Disabled	Warning
JUnit TestCase in product source	Disabled	Warning
JUnit TestCase with non-trivial constructors	Disabled	Warning
JUnit 4 test can be JUnit 5	Disabled	Warning
JUnit 4 test method in class extending JUnit 3 TestCase	Enabled	Warning
JUnit 5 malformed @Nested class	Enabled	Warning
JUnit 5 malformed parameterized test	Enabled	Warning
JUnit 5 malformed repeated test	Enabled	Warning
Malformed setUp() or tearDown() method	Disabled	Warning
Malformed @Before or @After method	Enabled	Warning
Malformed @BeforeClass/@BeforeAll or @AfterClass/@AfterAll method	Enabled	Warning
Malformed @DataPoint field	Disabled	Warning
Malformed @Rule/@ClassRule field	Disabled	Warning
Malformed test method	Enabled	Warning
Message missing on JUnit assertion	Disabled	Warning
Misordered assertEquals() arguments	Disabled	Warning
Multiple exceptions declared on test method	Disabled	Warning
Obsolete assertions in JUnit 5 tests	Disabled	Warning
Old style JUnit test method in JUnit 4 class	Disabled	Warning
@RunWith(JUnitPlatform.class) without test methods	Enabled	Warning
@RunWith(Parameterized.class) without data provider	Disabled	Warning
Simplifiable JUnit assertion	Enabled	Warning
suite() method not declared static	Enabled	Warning
super.tearDown() not called from finally block	Disabled	Warning
Test class with no tests	Disabled	Warning
Unconstructable JUnit TestCase	Enabled	Warning
Usage of obsolete junit.framework.Assert method	Disabled	Warning

Logging

Inspection name	Default state	Default severity
Class with multiple loggers	Disabled	Warning
Class without logger	Disabled	Warning
Log condition does not match logging call	Disabled	Warning
Logger initialized with foreign class	Disabled	Warning
Logging call not guarded by log condition	Disabled	Warning
Non-constant logger	Disabled	Warning
Non-constant string concatenation as argument to logging call	Disabled	Warning
Number of placeholders does not match number of arguments in logging call	Enabled	Warning
public method without logging	Disabled	Warning

Memory

Inspection name	Default state	Default severity
Anonymous class may be a named static inner class	Disabled	Warning
Calls to System.gc() or Runtime.gc()	Disabled	Warning
Inner class may be static	Enabled	Warning
Return of instance of anonymous, local or inner class	Disabled	Warning
Static collection	Disabled	Warning
StringBuilder field	Disabled	Warning
Unnecessary zero length array usage	Enabled	Warning
Zero-length array allocation	Disabled	Warning

Method metrics

Inspection name	Default state	Default severity
Constructor with too many parameters	Disabled	Warning
Method with more than three negations	Disabled	Warning
Method with multiple loops	Disabled	Warning
Method with multiple return points	Disabled	Warning
Method with too many exceptions declared	Disabled	Warning
Method with too many parameters	Disabled	Warning
Overly complex method	Disabled	Warning
Overly coupled method	Disabled	Warning
Overly long lambda expression	Disabled	Warning
Overly long method	Disabled	Warning
Overly nested method	Disabled	Warning

Modularization issues

Inspection name	Default state	Default severity
Class independent of its module	Disabled	Warning
Class only used from one other module	Disabled	Warning
Inconsistent language level settings	Disabled	Warning
Module with too few classes	Disabled	Warning
Module with too many classes	Disabled	Warning

Inspections labeled with are not available in the editor and can be launched via Code | Inspect Code or Code | Analyze Code | Run Inspection By Name....

Naming conventions

Inspection name	Default state	Default severity
Boolean method name must start with question word	Disabled	Warning
Class name prefixed with package name	Disabled	Warning
Class name same as ancestor name	Disabled	Warning
Class naming convention	Disabled	Warning
Confusing main() method	Disabled	Warning
Exception class name does not end with Exception	Disabled	Warning
Field naming convention	Disabled	Warning
Java module naming conventions	Enabled	Warning
Lambda parameter naming convention	Disabled	Warning
Lambda-unfriendly method overload	Disabled	Warning
Local variable naming convention	Disabled	Warning
Method name same as class name	Enabled	Warning
Method name same as parent class name	Disabled	Warning
Method names differing only by case	Disabled	Warning
Method naming convention	Disabled	Warning
Method parameter naming convention	Disabled	Warning
Non-boolean method name must not start with question word	Disabled	Warning
Non-constant field with upper-case name	Disabled	Warning
Non-exception class name ends with Exception	Disabled	Warning
Overloaded methods with same number of parameters	Disabled	Warning
Overloaded varargs method	Disabled	Warning
Package naming convention	Disabled	Warning
Parameter name differs from parameter in overridden method	Disabled	Warning
Questionable name	Disabled	Warning
Standard variable names	Disabled	Warning
Use of $ in identifier	Disabled	Warning

Numeric issues

Inspection name	Default state	Default severity
Call to BigDecimal method without a rounding mode argument	Enabled	Warning
char expression used in arithmetic context	Disabled	Warning
Comparison of short and char values	Disabled	Warning
Comparison to Double.NaN or Float.NaN	Enabled	Warning
Confusing floating-point literal	Disabled	Warning
Constant call to java.lang.Math	Disabled	Warning
Divide by zero	Enabled	Warning
double literal cast to float could be float literal	Disabled	Warning
equals() called on java.math.BigDecimal	Disabled	Warning
Floating point equality comparison	Disabled	Warning
Implicit numeric conversion	Disabled	Warning
int literal cast to long could be long literal	Disabled	Warning
Integer division in floating point context	Enabled	Warning
Integer multiplication or shift implicitly cast to long	Disabled	Warning
long literal ending with l instead of L	Enabled	Warning
Non-reproducible call to java.lang.Math	Disabled	Warning
Number constructor call with primitive argument	Enabled	Warning
Numeric cast that loses precision	Disabled	Warning
Numeric overflow	Enabled	Warning
Octal and decimal integers in same array	Disabled	Warning
Octal integer	Enabled	Warning
Overly complex arithmetic expression	Disabled	Warning
Pointless arithmetic expression	Enabled	Warning
Suspicious test for oddness	Disabled	Warning
Suspicious underscore in number literal	Disabled	Warning
Unary plus	Disabled	Warning
Unnecessary explicit numeric cast	Disabled	Warning
Unnecessary unary minus	Disabled	Warning
Unpredictable BigDecimal constructor call	Enabled	Warning

Packaging issues

Inspection name	Default state	Default severity
Class independent of its package	Disabled	Warning
Class only used from one other package	Disabled	Warning
Empty directory	Disabled	Warning
Exception package	Disabled	Warning
Package with classes in multiple modules	Disabled	Warning
Package with disjoint dependency graph	Disabled	Warning
Package with too few classes	Disabled	Warning
Package with too many classes	Disabled	Warning

Inspections labeled with are not available in the editor and can be launched via Code | Inspect Code or Code | Analyze Code | Run Inspection By Name....

Performance

Inspection name	Default state	Default severity
Boolean constructor call	Enabled	Warning
Boxing of already boxed value	Enabled	Warning
Bulk operation can be used instead of iteration	Enabled	Warning
Call to Arrays.asList() with too few arguments	Enabled	Warning
Call to simple getter from within class	Disabled	Warning
Call to simple setter from within class	Disabled	Warning
Class initializer may be static	Enabled	Warning
Collection.toArray() call style	Enabled	Warning
Collection without initial capacity	Disabled	Warning
Concatenation with empty string	Disabled	Warning
Dynamic regular expression could be replaced by compiled Pattern	Disabled	Warning
equals() call can be replaced with ==	Enabled	No highlighting, only fix
equals() or hashCode() called on java.net.URL object	Disabled	Warning
Explicit argument can be lambda	Enabled	No highlighting, only fix
Field may be static	Disabled	Warning
Inefficient Stream API call chains ending with count()	Enabled	Warning
Instantiating object to get Class object	Enabled	Warning
Iteration over keySet() may be optimized	Disabled	Warning
List.remove() called in loop	Enabled	Warning
Loop can be terminated after condition is met	Enabled	Warning
Manual array copy	Enabled	Warning
Manual array to collection copy	Enabled	Warning
Map or Set may contain java.net.URL objects	Disabled	Warning
Map replaceable with EnumMap	Disabled	Warning
Method may be static	Disabled	Warning
Non-constant String should be StringBuilder	Disabled	Warning
Object allocation in loop	Disabled	Warning
Object instantiation inside equals() or hashCode()	Disabled	Warning
Redundant Collection.addAll() call	Enabled	Warning
Redundant call to String.format()	Enabled	Warning
Set replaceable with EnumSet	Disabled	Warning
Single character string argument in String.indexOf() call	Disabled	Warning
Single character string concatenation	Enabled	No highlighting, only fix
String.equals("")	Disabled	Warning
String concatenation as argument to StringBuilder.append() call	Enabled	Warning
String concatenation in loop	Enabled	Warning
StringBuilder.toString() in concatenation	Disabled	Warning
StringBuilder without initial capacity	Disabled	Warning
Tail recursion	Enabled	No highlighting, only fix
Unnecessary temporary object in conversion from String	Enabled	Warning
Unnecessary temporary object in conversion to String	Enabled	Warning
Using Random.nextDouble() to get random integer	Disabled	Warning

Portability

Inspection name	Default state	Default severity
Call to Runtime.exec()	Disabled	Warning
Call to System.exit() or related methods	Disabled	Warning
Call to System.getenv()	Disabled	Warning
Hardcoded file separator	Disabled	Warning
Hardcoded line separator	Disabled	Warning
Native method	Disabled	Warning
Use of java.lang.ProcessBuilder class	Disabled	Warning
Use of AWT peer class	Disabled	Warning
Use of concrete JDBC driver class	Disabled	Warning
Use of sun.* classes	Disabled	Warning

Probable bugs

Nullability problems

Inspection name	Default state	Default severity
@NotNull field is not initialized	Enabled	Warning
@NotNull/@Nullable problems	Enabled	Warning
Return of null	Disabled	Warning

Inspection name	Default state	Default severity
Array comparison using ==, instead of Arrays.equals()	Disabled	Warning
assert statement condition is constant	Disabled	Warning
assert statement with side effects	Enabled	Warning
Call to toString() on array	Enabled	Warning
Call to String.replaceAll(".", ...)	Enabled	Warning
Call to default toString()	Disabled	Warning
Cast conflicts with instanceof	Disabled	Warning
Casting to incompatible interface	Disabled	Warning
Class.getClass() call	Enabled	Warning
Cleaner captures object reference	Enabled	Warning
Collection added to self	Enabled	Warning
Comparable implemented but equals() not overridden	Disabled	Warning
Confusing argument to varargs method	Enabled	Warning
Confusing primitive array argument to varargs method	Enabled	Warning
Constant conditions & exceptions	Enabled	Warning
Contract issues	Enabled	Warning
Copy constructor misses field	Enabled	Warning
Covariant equals()	Disabled	Warning
Duplicated delimiters in java.util.StringTokenizer	Enabled	Warning
Empty class initializer	Disabled	Warning
equal() instead of equals()	Disabled	Warning
equals() and hashCode() not paired	Disabled	Warning
equals() between objects of inconvertible types	Enabled	Warning
equals() called on StringBuilder	Enabled	Warning
equals() called on array	Enabled	Warning
equals() called on itself	Enabled	Warning
equals() method which does not check class of parameter	Enabled	Warning
hashCode() called on array	Enabled	Warning
Infinite recursion	Enabled	Warning
Inner class referenced via subclass	Disabled	Warning
instanceof with incompatible interface	Disabled	Warning
Instantiation of utility class	Disabled	Warning
Invalid method reference used for Comparator	Enabled	Warning
Iterable is used as vararg	Enabled	Warning
Iterator.hasNext() which calls next()	Disabled	Warning
Iterator.next() which can't throw NoSuchElementException	Disabled	Warning
Loop executes zero or billions times	Enabled	Warning
Magic Constant	Enabled	Warning
Malformed format string	Enabled	Warning
Malformed regular expression	Disabled	Warning
Malformed XPath expression	Enabled	Warning
Math.random() cast to int	Enabled	Warning
Mismatched case in String operation	Enabled	Warning
Mismatched query and update of StringBuilder	Enabled	Warning
Mismatched query and update of collection	Enabled	Warning
Mismatched read and write of array	Enabled	Warning
New object is compared using ==	Enabled	Warning
Non-final field referenced in compareTo()	Disabled	Warning
Non-final field referenced in equals()	Disabled	Warning
Non-final field referenced in hashCode()	Disabled	Warning
Non-short-circuit boolean expression	Disabled	Warning
Non-short-circuit operation consumes the infinite stream	Enabled	Warning
Number comparison using ==, instead of equals()	Enabled	Warning
Object comparison using ==, instead of equals()	Enabled	No highlighting, only fix
Objects.equals() called on arrays	Enabled	Warning
Optional.get() is called without isPresent() check	Enabled	Warning
Overwritten Map key or Set element	Enabled	Warning
Reference checked for null is not used inside if	Disabled	Warning
Reflective access to a source-only annotation	Enabled	Warning
Result of method call ignored	Enabled	Warning
Result of object allocation ignored	Disabled	Warning
Sorted collection with non-comparable elements	Enabled	Warning
Statement with empty body	Enabled	Warning
Static field referenced via subclass	Disabled	Warning
Static method referenced via subclass	Disabled	Warning
String.equals() called with CharSequence argument	Enabled	Warning
String comparison using ==, instead of equals()	Enabled	Warning
String concatenation as argument to MessageFormat.format() call	Disabled	Warning
String concatenation as argument to format() call	Disabled	Warning
String literal concatenation missing whitespace	Disabled	Warning
StringBuilder constructor call with char argument	Enabled	Warning
Subtraction in compareTo()	Disabled	Warning
Suspicious Collection.toArray() call	Enabled	Warning
Suspicious Comparator.compare() implementation	Enabled	Warning
Suspicious List.remove() in the loop	Enabled	Warning
Suspicious System.arraycopy() call	Enabled	Warning
Suspicious Arrays method calls	Enabled	Warning
Suspicious array cast	Disabled	Warning
Suspicious collections method calls	Enabled	Warning
Suspicious indentation after control statement without braces	Disabled	Warning
Suspicious integer division assignment	Enabled	Warning
Suspicious usage of compare method	Enabled	Warning
Suspicious variable/parameter name combination	Enabled	Warning
Text label in switch statement	Enabled	Warning
Throwable not thrown	Enabled	Warning
Unsafe call to Class.newInstance()	Disabled	Warning
Unused assignment	Enabled	Warning
Use of Properties object as a Hashtable	Disabled	Warning
Use of index 0 in JDBC ResultSet	Disabled	Warning
Wrong package statement	Enabled	Error

Properties Files

Inspection name	Default state	Default severity
Invalid property key	Enabled	Error

Reflective access

Inspection name	Default state	Default severity
MethodHandle/VarHandle type mismatch	Enabled	Warning
Non-runtime annotation to be used by reflection	Enabled	Warning
Reflective access across modules issues	Enabled	Warning
Reflective access to nonexistent/not visible class member	Enabled	Warning
Reflective invocation arguments mismatch	Enabled	Warning

Resource management

Inspection name	Default state	Default severity
Channel opened but not safely closed	Disabled	Warning
Hibernate resource opened but not safely closed	Disabled	Warning
I/O resource opened but not safely closed	Disabled	Warning
JDBC resource opened but not safely closed	Disabled	Warning
JNDI resource opened but not safely closed	Disabled	Warning
Socket opened but not safely closed	Disabled	Warning
Use of DriverManager to get JDBC connection	Disabled	Warning

Security

Inspection name	Default state	Default severity
Access of system properties	Disabled	Warning
Call to Connection.prepare*() with non-constant string	Disabled	Warning
Call to Runtime.exec() with non-constant string	Disabled	Warning
Call to Statement.execute() with non-constant string	Disabled	Warning
Call to System.loadLibrary() with non-constant string	Disabled	Warning
Call to System.setSecurityManager()	Disabled	Warning
ClassLoader instantiation	Disabled	Warning
Cloneable class in secure context	Disabled	Warning
Custom ClassLoader	Disabled	Warning
Custom SecurityManager	Disabled	Warning
Design for extension	Disabled	Warning
Insecure random number generation	Disabled	Warning
Non- static inner class in secure context	Disabled	Warning
Non-final clone() in secure context	Disabled	Warning
public static array field	Disabled	Warning
public static collection field	Disabled	Warning
Serializable class in secure context	Disabled	Warning

Serialization issues

Inspection name	Default state	Default severity
Comparator class not declared Serializable	Disabled	Warning
Externalizable class with readObject() or writeObject()	Disabled	Warning
Externalizable class without public no-arg constructor	Enabled	Warning
Instance field may not be initialized by readObject()	Disabled	Warning
Non-serializable class with readObject() or writeObject()	Disabled	Warning
Non-serializable class with serialVersionUID	Disabled	Warning
Non-serializable field in a Serializable class	Disabled	Warning
Non-serializable object bound to HttpSession	Disabled	Warning
Non-serializable object passed to ObjectOutputStream	Disabled	Warning
readObject() or writeObject() not declared private	Disabled	Warning
readResolve() or writeReplace() not declared protected	Disabled	Warning
Serializable class with unconstructable ancestor	Disabled	Warning
Serializable class without readObject() and writeObject()	Disabled	Warning
Serializable class without serialVersionUID	Disabled	Warning
Serializable non- static inner class with non-Serializable outer class	Disabled	Warning
Serializable non- static inner class without serialVersionUID	Disabled	Warning
Serializable object implicitly stores non-Serializable object	Disabled	Warning
serialPersistentFields field not declared private static final ObjectStreamField[]	Disabled	Warning
serialVersionUID field not declared private static final long	Disabled	Warning
Transient field in non-serializable class	Disabled	Warning
Transient field is not initialized on deserialization	Disabled	Warning

TestNG

Inspection name	Default state	Default severity
assertEquals() between objects of inconvertible types	Enabled	Warning
Constant TestNG assert argument	Disabled	Warning
Data provider problems	Enabled	Warning
dependsOnMethods problem	Enabled	Warning
Duplicated data provider names	Enabled	Error
Expected exception never thrown in test method body	Disabled	Warning
Groups problem	Enabled	Warning
Invalid data provider return type	Enabled	Error
JUnit Test can be converted to TestNG	Disabled	Warning
Message missing on TestNG assertion	Disabled	Warning
Misordered assertEquals() arguments	Disabled	Warning
Old TestNG annotation @Configuration is used	Disabled	Warning
Simplifiable TestNG assertion	Enabled	Warning
TestNG Javadoc can be converted to annotations	Disabled	Warning
Undeclared test	Disabled	Warning

Threading issues

Inspection name	Default state	Default severity
Access to static field locked on instance data	Disabled	Warning
AtomicFieldUpdater field not declared static final	Enabled	Warning
AtomicFieldUpdater issues	Enabled	Warning
await() not in loop	Disabled	Warning
await() without corresponding signal()	Disabled	Warning
Busy wait	Disabled	Warning
Call to System.runFinalizersOnExit()	Disabled	Warning
Call to Thread.run()	Enabled	Warning
Call to Thread.setPriority()	Disabled	Warning
Call to Thread.sleep() while synchronized	Disabled	Warning
Call to Thread.start() during object construction	Disabled	Warning
Call to Thread.stop(), suspend() or resume()	Disabled	Warning
Call to Thread.yield()	Disabled	Warning
Call to notify() instead of notifyAll()	Disabled	Warning
Call to signal() instead of signalAll()	Disabled	Warning
Call to a native method while locked	Disabled	Warning
Class directly extends java.lang.Thread	Disabled	Warning
Double-checked locking	Disabled	Warning
Empty synchronized statement	Disabled	Warning
Field accessed in both synchronized and unsynchronized contexts	Disabled	Warning
Instantiating a Thread with default run() method	Disabled	Warning
Lock acquired but not safely unlocked	Disabled	Warning
Method with synchronized block could be synchronized method	Disabled	Warning
Nested synchronized statement	Disabled	Warning
Non-atomic operation on volatile field	Enabled	Warning
Non-private field accessed in synchronized context	Disabled	Warning
Non thread-safe static field access	Disabled	Warning
notify() or notifyAll() called on java.util.concurrent.locks.Condition object	Disabled	Warning
notify() or notifyAll() without corresponding state change	Disabled	Warning
notify() without corresponding wait()	Disabled	Warning
signal() without corresponding await()	Disabled	Warning
Static initializer references subclass	Enabled	Warning
Synchronization on getClass()	Enabled	Warning
Synchronization on static field	Disabled	Warning
Synchronization on this	Disabled	Warning
Synchronization on a Lock object	Disabled	Warning
Synchronization on a non-final field	Enabled	Warning
Synchronization on an object initialized with a literal	Disabled	Warning
Synchronization on local variable or method parameter	Enabled	Warning
synchronized method	Disabled	Warning
ThreadLocal field not declared static final	Disabled	Warning
ThreadLocalRandom instance might be shared	Disabled	Warning
Unconditional wait() call	Disabled	Warning
Unsynchronized method overrides synchronized method	Disabled	Warning
Volatile array field	Disabled	Warning
wait() called on java.util.concurrent.locks.Condition object	Disabled	Warning
wait() not in loop	Disabled	Warning
wait() or await() without timeout	Disabled	Warning
wait() or notify() while not synchronized	Disabled	Warning
wait() while holding two locks	Disabled	Warning
wait() without corresponding notify()	Disabled	Warning
while loop spins on field	Enabled	Warning

toString() issues

Inspection name	Default state	Default severity
Class does not override toString() method	Disabled	Warning
Field not used in toString() method	Disabled	Warning

Verbose or redundant code constructs

Inspection name	Default state	Default severity
Comparator can be simplified	Enabled	Warning
Condition is covered by further condition	Enabled	Warning
Duplicate branches in switch	Enabled	Weak Warning
Excessive lambda usage	Enabled	Warning
Excessive range check	Enabled	Warning
Explicit array filling	Enabled	Warning
Manual min/max calculation	Enabled	Warning
Multiple occurrences of the same expression	Enabled	Weak Warning
Redundant compare method call	Enabled	Warning
Redundant isInstance or cast call	Enabled	Warning
Redundant Collection operation	Enabled	Warning
Redundant String operation	Enabled	Warning
Redundant array creation	Enabled	Warning
Redundant type arguments	Enabled	Warning
Redundant type cast	Enabled	Warning
StringBuilder can be replaced with String	Enabled	Warning
Too weak variable type leads to unnecessary cast	Enabled	Warning
Unnecessary break statement	Enabled	Warning
Unnecessary continue statement	Enabled	Warning
Unnecessary default for enum switch statement	Enabled	Warning
Unnecessarily escaped character	Enabled	Warning
Unnecessary return statement	Enabled	Warning
Unnecessary label on break statement	Enabled	Warning
Unnecessary label on continue statement	Enabled	Warning

Visibility

Inspection name	Default state	Default severity
Access of inherited field looks like access of element in surrounding code	Disabled	Warning
Anonymous class variable hides variable in containing method	Disabled	Warning
Call to inherited method looks like call to local method	Disabled	Warning
Field name hides field in superclass	Disabled	Warning
Inner class field hides outer class field	Disabled	Warning
Lambda parameter hides field	Disabled	Warning
Local variable hides field	Disabled	Warning
Method overloads method of superclass	Disabled	Warning
Method overrides inaccessible method of superclass	Disabled	Warning
Method tries to override static method of superclass	Disabled	Warning
Module exports/opens package to itself	Enabled	Warning
Non-accessible class is exposed	Enabled	Warning
Parameter hides field	Disabled	Warning
Type parameter hides visible type	Enabled	Warning
Usage of service not declared in module-info	Enabled	Warning