RuntimeException: Package jdk.internal.jimage.decompressor in module jrt.fs and module java.base

问题

Component Details - Using IntelliJ IDEA 2017.1 CE and jdk-9-ea+154

main() -

Set<String> set2 = Set.of("a", "b", "c");
set2.forEach(System.out::println);

module-info.java

module collection {
    requires java.base;
}

Logs -

Error occurred during initialization of VM
java.lang.RuntimeException: Package jdk.internal.jimage.decompressor in both module jrt.fs and module java.base
    at jdk.internal.module.ModuleBootstrap.fail(java.base@9-ea/ModuleBootstrap.java:699)
    at jdk.internal.module.ModuleBootstrap.boot(java.base@9-ea/ModuleBootstrap.java:329)
    at java.lang.System.initPhase2(java.base@9-ea/System.java:1928)

Doubtful over the implementation of initialization of VM, my question is that I haven't included module jrt.fs - Where is it coming in the picture from? How do I debug such modules inclusion/exclusion? How do I further solve the current exception?

回答1:

$JAVA_HOME/lib/jrt-fs.jar contains a copy of the "jrt" file system provider compiled to JDK 8. It's for tools such as IDEs that run on JDK 8 but need to access a JDK 9 run-time image.

From the exception then it does appear that this JAR file, or maybe $JAVA_HOME/lib, has been put on the module path in error. JAR files that do no contain a module-info.class in the top-level directory are treated as automatic modules so this is why the exception has "module jrt.fs" in the message. The exception basically just means that you've ended up with two modules containing the jdk.internal.jimage.decompressor package (and many other packages) due to putting jrt-fs.jar on the module path.

回答2:

I had the same issue on Manjaro Linux, while it was working fine on windows. Looking at the differences it became clear that the javafx 11 package installs into /lib/jvm/java-11-openjdk/lib, which I then set as PATH_TO_FX. This seems to be the issue, because jrt-fs.jar is in the same folder.

I moved all files from fx to a separate folder and then set that as PATH_TO_FX. Now it works fine.

回答3:

Try to remove jrt-fs.jar from the directory of jdk9. I did it in Project Structure in IntelliJ IDEA and it works fine for me

回答4:

In Eclipse, changing the Eclipse workspace or deleting the .metadata folder in the workspace folder worked for me.

I don’t know what fixed it, but if I had to guess it could be something in the .metadata folder that caused the exception.

来源：https://stackoverflow.com/questions/42986287/runtimeexception-package-jdk-internal-jimage-decompressor-in-module-jrt-fs-and