CODEWITHSUNDEEP
javagroovyclassloader
rhinds
rhinds

Reputation: 10043

Classes Loaded by GroovyClassLoader not listed

I am investigating memory leak in some JVM bsaed code (groovy running in a Java env).

I have a simple Java test class that I am using to investigate various behaviours around Groovy class loading, and I am running the following code (from plain Java):

GroovyClassLoader localGroovyClassLoader = new GroovyClassLoader();
Class clazz = localGroovyClassLoader.loadClass("com.test.Example", true, false, true);

Where Example is just a simple Groovy class (doesn't do anything particular as its just my dummy case).

Now, if immediately after the above code I log the following:

localGroovyClassLoader.getLoadedClasses().length

It logs a 0 - despite that I can verify that my loaded class is all good (clazz outputs that it is in fact Example).

The reason I want to use the getLoadedClasses() method is because I am dynamically reloading groovy on the fly, so when reloading I want to also clear the meta registry (as detailed here: https://stackoverflow.com/a/10484023/258813 ) - so was planning on using the following code:

for (Class c : localGroovyClassLoader.getLoadedClasses()){
    GroovySystem.getMetaClassRegistry().removeMetaClass(c);
}

But obviously, if getLoadedClasses() returns 0 despite having just loaded a class I will not be able to run the above code.

Thanks

Upvotes: 2

Views: 914

Answers (1)

Ian Roberts
Ian Roberts

Reputation: 122364

Do you have the com.test.Example compiled class in the parent classloader? Calling getLoadedClasses only gives you the classes that this GCL loaded directly itself. If it was able to find a particular class by delegating to its parent loader then it doesn't need to load the class itself, and the class won't be included in getLoadedClasses.

Upvotes: 1

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