"java --describe-module" - Printing Module Definition

This section provides a tutorial example on how to use 'java --describe-module' command to print out the definition of a given Java module.



If you want to see what Java packages are exported from a given Java module, you can use the 'java --describe-module' command:

C:\herong>javac --describe-module java.base

java.base@12.0.1
exports java.io
exports java.lang
exports java.lang.annotation
exports java.lang.invoke
exports java.lang.module
exports java.lang.ref
exports java.lang.reflect
exports java.math
exports java.net
exports java.net.spi
exports java.nio
exports java.nio.channels
exports java.nio.channels.spi
exports java.nio.charset
exports java.nio.charset.spi
exports java.nio.file
...
exports javax.crypto
exports javax.crypto.interfaces
exports javax.crypto.spec
exports javax.net
exports javax.net.ssl
exports javax.security.auth
...
uses java.nio.file.spi.FileTypeDetector
uses java.lang.System$LoggerFinder
uses java.util.spi.LocaleNameProvider
uses java.text.spi.BreakIteratorProvider
uses java.util.spi.ResourceBundleProvider
...
provides java.nio.file.spi.FileSystemProvider 
   with jdk.internal.jrtfs.JrtFileSystemProvider
qualified exports jdk.internal to jdk.jfr
qualified exports jdk.internal.jmod to jdk.jlink jdk.compiler
...
contains com.sun.crypto.provider
contains com.sun.java.util.jar.pack
contains com.sun.net.ssl
...



 

Table of Contents

 About This Book

 Java Tools Terminology

 Java Tools Included in JDK

 javac - The Java Program Compiler

 jar - The JAR File Tool

 jlink - The JRE Linker

 jmod - The JMOD File Tool

 jimage - The JIMAGE File Tool

java - The Java Program Launcher

 java - Program Launching Command and Options

 Launching Hello.java - My First Java Program

 "java -classpath" - Specifying Class Path

 "java -jar" - Specifying Executable JAR File

 "java -X" - Specifying Non-Standard Options

 "java --list-modules" - Listing Modules in JDK

"java --describe-module" - Printing Module Definition

 "java --module" - Launching Program from Module

 "java --module" - Launching Program from Module JAR

 javaw - Launching Java Programs without Console

 jdeps - The Java Class Dependency Analyzer

 jdeprscan - The Java Deprecated API Scanner

 jdb - The Java Debugger

 jcmd - The JVM Diagnostic Tool

 jconsole - Java Monitoring and Management Console

 jstat - JVM Statistics Monitoring Tool

 JVM Troubleshooting Tools

 jhsdb - The Java HotSpot Debugger

 jvisualvm (Java VisualVM) - JVM Visual Tool

 jmc - Java Mission Control

 javap - The Java Class File Disassembler

 keytool - Public Key Certificate Tool

 jarsigner - JAR File Signer

 jshell - Java Language Shell

 native2ascii - Native-to-ASCII Encoding Converter

 Outdated Tutorials

 References

 Full Version in PDF/EPUB