Not Finding Classpath Elements on Java 11

I’m using ClassGraph 4.8.53 and having a problem with Java 11 not finding classpath elements but it’s working on Java 8.

Here is what I’m seeing on Java 11:

2019-11-17T08:01:56.968-0700	ClassGraph	Finding classpath
2019-11-17T08:01:56.968-0700	ClassGraph	-- Finding classpath and modules
2019-11-17T08:01:56.969-0700	ClassGraph	---- Found ClassLoaders:
2019-11-17T08:01:56.969-0700	ClassGraph	------ jdk.internal.loader.ClassLoaders$AppClassLoader
2019-11-17T08:01:56.969-0700	ClassGraph	---- Overriding classpath with: jdk.internal.loader.ClassLoaders$AppClassLoader@77556fd
2019-11-17T08:01:56.969-0700	ClassGraph	------ Found classpath element: jdk.internal.loader.ClassLoaders$AppClassLoader@77556fd -> /home/jw/projects/webjars/webjars-play/jdk.internal.loader.ClassLoaders$AppClassLoader@77556fd
2019-11-17T08:01:56.969-0700	ClassGraph	------ WARNING: when the classpath is overridden, there is no guarantee that the classes found by classpath scanning will be the same as the classes loaded by the context classloader
2019-11-17T08:01:56.969-0700	ClassGraph	-- Module scanning is disabled, because classloaders or classpath was overridden
2019-11-17T08:01:56.970-0700	ClassGraph	Opening classpath elements (took 0.026549 sec)
2019-11-17T08:01:56.970-0700	ClassGraph	-- Skipping invalid classpath element /home/jw/projects/webjars/webjars-play/jdk.internal.loader.ClassLoaders$AppClassLoader@77556fd : java.io.FileNotFoundException
2019-11-17T08:01:56.996-0700	ClassGraph	Finding nested classpath elements
2019-11-17T08:01:56.996-0700	ClassGraph	Final classpath element order:
2019-11-17T08:01:56.997-0700	ClassGraph	Scanning classpath elements (took 0.000006 sec)
2019-11-17T08:01:56.997-0700	ClassGraph	Classfile scanning is disabled

This seems to only be a problem when I call overrideClassLoaders(classLoader). If I call getResources on the classloader I can see everything I’m looking for.

Sorry I don’t understand much about how the classpath stuff might have changed in Java 11.

[lukehutch]

The fix for this was incomplete, see #411. The full fix is in git master, and will be released in 4.8.67 (might take a few days to hit Maven Central, because Sonatype is currently having issues).

[lukehutch]

You’re welcome, that’s the goal! I try to maintain this project how I wish all open source software was maintained. (This is the software version of The Golden Rule 😃 )

The change I just checked in catches one additional case – it also enables system module scanning if you override the classloaders with the parent of an AppClassLoader, which is a PlatformClassLoader (which only loads classes for system modules).

It’s a simple enough change that I’ll just cross my fingers and hope it works 😄 Released in 4.8.54. You should be able to revert your latest change and just depend upon this version to fix the problem.

Thanks for your report!