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From "Xu Xin" <>
Subject The AntClassLoader created in one JUnitTask can not be used in another.
Date Wed, 09 May 2007 15:20:54 GMT
Hello everyone,

I had a problem with JUnitTask, I have a couple of xml files where I also
have a lot of targets which contain <junit> tasks, originally I used the
Apache Ant's JUnitTask, but unfortunately the test run had performance
issue, that was caused by  each <test> has its own classloader, as a result
some static memory was created multiple times.

So I customized the JUnitTask by making the classloader created for each
test cacheable, the <junit> task has the same customer classpath elements
share the same classloader, so I can save the memory as I can, but the
strange thing is  junit testcase was not recognized, it seemed a
classloading issue, but after I ran the tests in DEBUG mode, I can find the
classloader hierarchy is correct, I do not know what's going wrong. The
snippet code is below:

private void createClassLoader() {
    Path userClasspath = getCommandline().getClasspath();

    if (userClasspath != null) {

    //get cached classloader from the pool if it exists
      classLoader = getCachedClassLoader(userClasspath);

      Path classpath = (Path) userClasspath.clone();
      if (includeAntRuntime) {
        log("Implicitly adding " + antRuntimeClasses + " to CLASSPATH",
      if (reloading || classLoader == null) {

      //create a new one if no cached

        classLoader = getProject().createClassLoader(classpath);
        if (getClass().getClassLoader() != null
            && getClass().getClassLoader() != Project.class.getClassLoader())
        // make sure the test will be accepted as a TestCase
        // will cause trouble in JDK 1.1 if omitted
        // testlogic: this fixes 'not a JUnitResultFormatter' issue

        cacheClassLoader(userClasspath, classLoader);
      } else {

     //this is the cached one
        if (classLoader != null) {
            if (getClass().getClassLoader() != null
              && getClass().getClassLoader() != Project.class.getClassLoader())



and next pass the classLoader to JUnitTestRunner as usual, the test class
can be loaded, as well as JUnit class: TestSuite and Test, but when
constructing TestCase, TestSuite complains the test class is not
implementation of Test, but I can see the test class was loaded by cached
AntClassLoader, and TestSuite and Test were loaded by its parent
classloader. So could you guys please tell me what's wrong?

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