jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader

[oeway]

Hi, we are hitting this error with JDK 11:

(Fiji Is Just) ImageJ 2.1.0/1.53c; Java 11.0.11 [64-bit]; Linux 4.15.0-144-generic; 361MB of 79744MB (<1%)
 
java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
	at net.imagej.legacy.LegacyService.runLegacyCompatibleCommand(LegacyService.java:307)
	at net.imagej.legacy.DefaultLegacyHooks.interceptRunPlugIn(DefaultLegacyHooks.java:166)
	at ij.IJ.runPlugIn(IJ.java)
	at ij.Executer.runCommand(Executer.java:150)
	at ij.Executer.run(Executer.java:68)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.util.concurrent.ExecutionException: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
	at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
	at net.imagej.legacy.LegacyService.runLegacyCompatibleCommand(LegacyService.java:303)
	... 5 more
Caused by: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
	at net.imagej.tensorflow.util.TensorFlowUtil.getTensorFlowJARVersion(TensorFlowUtil.java:79)
	at net.imagej.tensorflow.util.TensorFlowUtil.versionFromClassPathJAR(TensorFlowUtil.java:94)
	at net.imagej.tensorflow.ui.TensorFlowLibraryManagementCommand.getTensorFlowJARVersion(TensorFlowLibraryManagementCommand.java:112)
	at net.imagej.tensorflow.ui.TensorFlowLibraryManagementCommand.initAvailableVersions(TensorFlowLibraryManagementCommand.java:98)
	at net.imagej.tensorflow.ui.TensorFlowLibraryManagementCommand.run(TensorFlowLibraryManagementCommand.java:86)
	at org.scijava.command.CommandModule.run(CommandModule.java:196)
	at org.scijava.module.ModuleRunner.run(ModuleRunner.java:165)
	at org.scijava.module.ModuleRunner.call(ModuleRunner.java:124)
	at org.scijava.module.ModuleRunner.call(ModuleRunner.java:63)
	at org.scijava.thread.DefaultThreadService.lambda$wrap$2(DefaultThreadService.java:225)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	... 1 more

Here is the java version:

ac4816754e0b:~/Fiji.app$ java -version
openjdk version "11.0.11" 2021-04-20
OpenJDK Runtime Environment AdoptOpenJDK-11.0.11+9 (build 11.0.11+9)
OpenJDK 64-Bit Server VM AdoptOpenJDK-11.0.11+9 (build 11.0.11+9, mixed mode)

cc @esgomezm

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/jaunch-a-new-java-launcher-test-fiji-with-java-21/92058/69

[ctrueden]

One tool that could be helpful in fixing this problem is ClassGraph.