The Java Tutorials have been written for JDK 8.Java教程是为JDK 8编写的。Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.本页中描述的示例和实践没有利用后续版本中引入的改进，并且可能使用不再可用的技术。See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.有关Java SE 9及其后续版本中更新的语言特性的摘要，请参阅Java语言更改。
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.有关所有JDK版本的新功能、增强功能以及已删除或不推荐的选项的信息，请参阅JDK发行说明。
The javax.xml.XMLConstants#FEATURE_SECURE_PROCESSING (FSP) feature is required for XML processors including DOM, SAX, Schema Validation, XSLT, and XPath. The proposed default limits are enforced when FSP is set to true. Setting FSP to false does not change the limits.
When the Java Security Manager is present, FSP is set to true and can not be turned off. The proposed default limits are therefore enforced.
Properties specified in the jaxp.properties file affect all invocations of the JDK and JRE, and will override their default values, or those that may have been set by FSP.
System properties, when set, affect the invocation of the JDK and JRE, and override the default settings or that set in jaxp.properties, or those that may have been set by FSP.
JAXP properties specified through JAXP factories or SAXParser take preference over system properties, the jaxp.properties file, as well as FEATURE_SECURE_PROCESSING.