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Java Standard Edition (SE)

Tools Enhancements in JDK 8

Tools Enhancements in JDK 8

JDK Tools and Utilities

The following enhancements were introduced in JDK 8:

  • The jjs command was introduced, which invokes the Nashorn engine either in interactive shell mode, or to interpret script files. For more information, see the Nashorn User's Guide.

  • The java command is capable of launching JavaFX applications, provided that the JavaFX application is packaged correctly. See How Classes are Found.

  • The java command man page (both nroff and HTML) has been completely reworked. The advanced options are now divided into Runtime, Compiler, Garbage Collection, and Serviceability, according to the area that they affect. Several previously missing options are now described. There is also a section for options that were deprecated or removed since the previous release.

  • The new jdeps command-line tool allows the developer to analyze class files to determine package-level or class-level dependencies. See JDK-8003562.

  • JDK 8 provides remote access to diagnostic commands which were previously accessible only locally via the jcmd tool. Remote access is provided using the Java Management Extensions (JMX), so diagnostic commands are exposed to a platform MBean registered to the platform MBean server. The MBean is the interface. See the jcmd for Unix or Windows.

  • The jarsigner tool contains a new option -tsapolicyid which enables you to request a signed time stamp from a Time Stamping Authority and attach it to a signed JAR file. See JDK-8009636

  • You can obtain the names of the formal parameters of any method or constructor with the method java.lang.reflect.Executable.getParameters. However, .class files do not store formal parameter names by default. To store formal parameter names in a particular .class file, and thus enable the Reflection API to retrieve formal parameter names, compile the source file with the -parameters option of the javac compiler. See JDK-8004727.

  • The type rules for binary comparisons in the Java Language Specification (JLS) Section 15.21 will now be correctly enforced by javac. Since JDK5, javac has accepted some programs with Object-primitive comparisons that are incorrectly typed according to JLS 15.21. These comparisons will now be correctly identified as type errors. See JDK-8013357.

  • The apt tool and its associated API contained in the package com.sun.mirror have been removed in this release. Use the options available in the javac tool and the APIs contained in the packages javax.annotation.processing and javax.lang.model to process annotations. See JDK-7041249

For enhancements pertaining to the javadoc tool, see the What's New page for Javadoc.


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