Using javax.tools.ToolProvider from a custom classloader?

Using javax.tools.ToolProvider from a custom classloader?

By : SpeedKnight
Date : October 26 2020, 11:51 AM
help you fix your problem I had exactly the same problem. I'm using a custom ant task to scan the AST for certain kinds of method invocations. My solution, which may not be appropriate for you, was to instantiate the compiler myself instead of using the ToolProvider.
I replaced
code :

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Compiling classes with Toolprovider and loading them with ClassLoader

Compiling classes with Toolprovider and loading them with ClassLoader

By : user3458489
Date : March 29 2020, 07:55 AM
this one helps. Your last attempt should work. myUrl should refer to the directory (or Jar) containing the .class generated.
code :
myUrl = new URL("file:///myGeneratedCode/");
How to find classloader leak with free tools?

How to find classloader leak with free tools?

By : J Skinner
Date : March 29 2020, 07:55 AM
To fix the issue you can do You can use the evaluation version of JProfiler to investigate the class loader leak. Go to the class loader probe, select one of the leaking class loaders and show them in the heap walker where you can investigate strong references to the classes that were loaded by the class loader.
There is a screen cast that shows you how to do this.
Intercepting ClassLoader.getResource(String) calls, with a custom ClassLoader

Intercepting ClassLoader.getResource(String) calls, with a custom ClassLoader

By : Jasmine Jackson
Date : March 29 2020, 07:55 AM
seems to work fine Yes. This works, in principal.
However, you've to account how the resource loading code get's to the class loader. Since the class don't show up, it looks like they use the parents class loader. You've to account different scenarios:
code :
Method main = realAppClasss.getMethod("main", String[].class);
main.invoke(null, (Object) args);
// URL class loader to lookup in jars etc
private static class MyClassLoader extends URLClassLoader
    public MyClassLoader(URL[] urls) {
        // Use the given URLs and skip any parent class loader, directly go to the system loader

// ...

// Then setup the class path
    String[] classPath = System.getProperty("java.class.path").split(";");
    URL[] classPathUrls = new URL[classPath.length];
    for (int i = 0; i < classPath.length; i++) {
        classPathUrls[i] = new File(classPath[i]).toURL();

    MyClassLoader loader = new MyClassLoader(classPathUrls);
How do I use JDK6 ToolProvider and JavaCompiler with the context classloader?

How do I use JDK6 ToolProvider and JavaCompiler with the context classloader?

By : user3742842
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further If you know the classpath to the files that are known to the contextclassloader you can pass them to the compiler:
Java Class cast exception, Classloader error on using javax xml providers?

Java Class cast exception, Classloader error on using javax xml providers?

By : Antony Raja
Date : March 29 2020, 07:55 AM
With these it helps You may need to set -Dorg.osgi.framework.bootdelegation=com.sun.*. See https://osgi.org/specification/osgi.core/7.0.0/framework.module.html#framework.module.parentdelegation. It is possible Equinox provides a common, useful default for boot delegation while Karaf does not.
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