Program: 61635
Project: 61635
Buggy source:
/** 
 * Process-based validation Advantage: stability, memory consumption, CG activity Disadvantage: time.
 * @param mutatedVariant
 * @return
 */
@Override public ProgramVariantValidationResult validate(ProgramVariant mutatedVariant,ProjectRepairFacade projectFacade){
  try {
    String bytecodeOutput=projectFacade.getOutDirWithPrefix(mutatedVariant.currentMutatorIdentifier());
    File variantOutputFile=new File(bytecodeOutput);
    URL[] bc=null;
    URL[] originalURL=projectFacade.getURLforMutation(ProgramVariant.DEFAULT_ORIGINAL_VARIANT);
    if (mutatedVariant.getCompilation() != null) {
      MutationSupporter.currentSupporter.getSpoonClassCompiler().saveByteCode(mutatedVariant.getCompilation(),variantOutputFile);
      bc=redefineURL(variantOutputFile,originalURL);
    }
 else {
      bc=originalURL;
    }
    JUnitExecutorProcess p=new JUnitExecutorProcess();
    String localPrefix=projectFacade.getProperties().getExperimentName() + File.separator + projectFacade.getProperties().getFixid();
    TestResult trfailing=p.execute(bc,projectFacade.getProperties().getFailingTestCases(),TransformationProperties.validationSingleTimeLimit * 5);
    if (trfailing == null) {
      log.debug("String_Node_Str");
      return null;
    }
 else {
      log.debug(trfailing);
      if (trfailing.wasSuccessful()) {
        if (TransformationProperties.allTestInOneProcess)         return executeRegressionTesting(mutatedVariant,bc,p,localPrefix);
 else         return executeRegressionTestingOneByOne(mutatedVariant,bc,p,localPrefix);
      }
 else {
        ProgramVariantValidationResult r=new ProgramVariantValidationResult(trfailing,false,false);
        return r;
      }
    }
  }
 catch (  Exception e) {
    e.printStackTrace();
    return null;
  }
}

Fixed version (ground truth):
/** 
 * Process-based validation Advantage: stability, memory consumption, CG activity Disadvantage: time.
 * @param mutatedVariant
 * @return
 */
@Override public ProgramVariantValidationResult validate(ProgramVariant mutatedVariant,ProjectRepairFacade projectFacade){
  try {
    String bytecodeOutput=projectFacade.getOutDirWithPrefix(mutatedVariant.currentMutatorIdentifier());
    File variantOutputFile=new File(bytecodeOutput);
    URL[] bc=null;
    URL[] originalURL=projectFacade.getURLforMutation(ProgramVariant.DEFAULT_ORIGINAL_VARIANT);
    if (mutatedVariant.getCompilation() != null) {
      MutationSupporter.currentSupporter.getSpoonClassCompiler().saveByteCode(mutatedVariant.getCompilation(),variantOutputFile);
      bc=redefineURL(variantOutputFile,originalURL);
    }
 else {
      bc=originalURL;
    }
    JUnitExecutorProcess p=new JUnitExecutorProcess();
    String localPrefix=projectFacade.getProperties().getExperimentName() + File.separator + projectFacade.getProperties().getFixid();
    log.debug("String_Node_Str");
    TestResult trfailing=p.execute(bc,projectFacade.getProperties().getFailingTestCases(),TransformationProperties.validationSingleTimeLimit * 5);
    if (trfailing == null) {
      log.debug("String_Node_Str");
      return null;
    }
 else {
      log.debug(trfailing);
      if (trfailing.wasSuccessful()) {
        if (TransformationProperties.allTestInOneProcess)         return executeRegressionTesting(mutatedVariant,bc,p,localPrefix);
 else         return executeRegressionTestingOneByOne(mutatedVariant,bc,p,localPrefix);
      }
 else {
        ProgramVariantValidationResult r=new ProgramVariantValidationResult(trfailing,false,false);
        return r;
      }
    }
  }
 catch (  Exception e) {
    e.printStackTrace();
    return null;
  }
}