/**
   * Ensure that we will never have the following error.
   *
   * <p>The test works as follows: - Use the CliFrontend to invoke a jar file that loads a class
   * which is only available in the jarfile itself (via a custom classloader) - Change the Usercode
   * classloader of the PackagedProgram to a special classloader for this test - the classloader
   * will accept the special class (and return a String.class)
   *
   * <p>org.apache.flink.client.program.ProgramInvocationException: The main method caused an error.
   * at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:398) at
   * org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:301)
   * at org.apache.flink.client.program.Client.getOptimizedPlan(Client.java:140) at
   * org.apache.flink.client.program.Client.getOptimizedPlanAsJson(Client.java:125) at
   * org.apache.flink.client.CliFrontend.info(CliFrontend.java:439) at
   * org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:931) at
   * org.apache.flink.client.CliFrontend.main(CliFrontend.java:951) Caused by: java.io.IOException:
   * java.lang.RuntimeException: java.lang.ClassNotFoundException:
   * org.apache.hadoop.hive.ql.io.RCFileInputFormat at
   * org.apache.hcatalog.mapreduce.HCatInputFormat.setInput(HCatInputFormat.java:102) at
   * org.apache.hcatalog.mapreduce.HCatInputFormat.setInput(HCatInputFormat.java:54) at
   * tlabs.CDR_In_Report.createHCatInputFormat(CDR_In_Report.java:322) at
   * tlabs.CDR_Out_Report.main(CDR_Out_Report.java:380) at
   * sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
   * sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at
   * sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at
   * java.lang.reflect.Method.invoke(Method.java:622) at
   * org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:383)
   */
  @Test
  public void testPlanWithExternalClass() throws CompilerException, ProgramInvocationException {
    final Boolean callme[] = {
      false
    }; // create a final object reference, to be able to change its val later
    try {
      String[] parameters = {
        getTestJarPath(), "-c", TEST_JAR_CLASSLOADERTEST_CLASS, "some", "program"
      };
      CommandLine line =
          new PosixParser()
              .parse(CliFrontend.getProgramSpecificOptions(new Options()), parameters, false);

      CliFrontend frontend = new CliFrontend();
      Object result = frontend.buildProgram(line);
      assertTrue(result instanceof PackagedProgram);

      PackagedProgram prog = spy((PackagedProgram) result);

      ClassLoader testClassLoader =
          new ClassLoader(prog.getUserCodeClassLoader()) {
            @Override
            public Class<?> loadClass(String name) throws ClassNotFoundException {
              assertTrue(name.equals("org.apache.hadoop.hive.ql.io.RCFileInputFormat"));
              callme[0] = true;
              return String.class; // Intentionally return the wrong class.
            }
          };
      when(prog.getUserCodeClassLoader()).thenReturn(testClassLoader);

      Assert.assertArrayEquals(new String[] {"some", "program"}, prog.getArguments());
      Assert.assertEquals(TEST_JAR_CLASSLOADERTEST_CLASS, prog.getMainClassName());

      Configuration c = new Configuration();
      c.setString(ConfigConstants.JOB_MANAGER_IPC_ADDRESS_KEY, "devil");
      Client cli = new Client(c, getClass().getClassLoader());

      cli.getOptimizedPlanAsJson(prog, 666);
    } catch (ProgramInvocationException pie) {
      assertTrue("Classloader was not called", callme[0]);
      // class not found exception is expected as some point
      if (!(pie.getCause() instanceof ClassNotFoundException)) {
        System.err.println(pie.getMessage());
        pie.printStackTrace();
        fail("Program caused an exception: " + pie.getMessage());
      }
    } catch (Exception e) {
      assertTrue("Classloader was not called", callme[0]);
      System.err.println(e.getMessage());
      e.printStackTrace();
      fail("Program caused an exception: " + e.getMessage());
    }
  }
  @Test
  public void testVariantWithExplicitJarAndArgumentsOption() {
    try {
      String[] parameters = {"-j", getTestJarPath(), "-a", "some", "program", "arguments"};
      CommandLine line =
          new PosixParser()
              .parse(CliFrontend.getProgramSpecificOptions(new Options()), parameters, false);

      CliFrontend frontend = new CliFrontend();
      Object result = frontend.buildProgram(line);
      assertTrue(result instanceof PackagedProgram);

      PackagedProgram prog = (PackagedProgram) result;

      Assert.assertArrayEquals(new String[] {"some", "program", "arguments"}, prog.getArguments());
      Assert.assertEquals(TEST_JAR_MAIN_CLASS, prog.getMainClassName());
    } catch (Exception e) {
      System.err.println(e.getMessage());
      e.printStackTrace();
      fail("Program caused an exception: " + e.getMessage());
    }
  }