Add a custom jmod to the module path using java 9

• Java

I used this jmod tool to create a simple jmod file

$JAVA_HOME/bin/jmod create --class-path classes test/samples.jmod

Next, I try to execute a class in the module by running the following command:

java -mp test -m de.mypackage/de.mypackage.Test

This results in the following exceptions:

Error occurred during initialization of VM
java.lang.module.ResolutionException: JMOD files not supported: test/samples.jmod
  at java.lang.module.Resolver.findWithBeforeFinder(java.base@9-ea/Resolver.java:729)
  at java.lang.module.Resolver.resolveRequires(java.base@9-ea/Resolver.java:86)
  at java.lang.module.Configuration.resolveRequiresAndUses(java.base@9-ea/Configuration.java:370)
  at java.lang.module.ModuleDescriptor$1.resolveRequiresAndUses(java.base@9-ea/ModuleDescriptor.java:1986)
  at jdk.internal.module.ModuleBootstrap.boot(java.base@9-ea/ModuleBootstrap.java:263)
  at java.lang.system.initPhase2(java.base@9-ea/System.java:1928)

If I just set my classes directory (the jmod file I used to create) to modulepath, everything works as expected

Is it usually impossible to have jmod files on the module path? If so, is there any reason?

Solution

See http://openjdk.java.net/jeps/261#Packaging: -JMOD-files

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