void checkBuild(String module, String classname, String[] args, boolean addAnt) {
    if (!shouldBuild(module)) {
      return;
    }
    assertTrue(null != module);
    checkJavac();
    doTask(module, true, false);
    doTask(module, true, true);
    doTask(module, false, false);
    File jar = doTask(module, false, true, true);

    // verify if possible
    if (null != classname) {
      Java java = new Java();
      Project project = new Project();
      java.setProject(project);
      java.setFailonerror(true);
      Path cp = new Path(project);
      assertTrue(jar.canRead());
      cp.append(new Path(project, jar.getAbsolutePath()));
      if (addAnt) {
        cp.append(new Path(project, getAntJar().getAbsolutePath()));
        cp.append(new Path(project, getJUnitJar().getAbsolutePath()));
      }
      java.setClasspath(cp);
      java.setClassname(classname);
      if (null != args) {
        for (int i = 0; i < args.length; i++) {
          Argument arg = java.createArg();
          arg.setValue(args[i]);
        }
      }
      try {
        java.execute();
      } catch (BuildException e) {
        e.printStackTrace(System.err);
        assertTrue("BuildException running " + classname, false);
      }
    }
    deleteJar(jar);
  }