Program: 96244
Project: 96244
Buggy source:
/** 
 * {@inheritDoc}
 * @param parentElement Object
 * @return object array
 */
public Object[] getChildren(Object parentElement){
  if (parentElement instanceof IExecTestCasePO) {
    ISpecTestCasePO referencedTestCase=((IExecTestCasePO)parentElement).getSpecTestCase();
    if (referencedTestCase != null) {
      return ArrayUtils.addAll(Collections.unmodifiableCollection(referencedTestCase.getAllEventEventExecTC()).toArray(),referencedTestCase.getUnmodifiableNodeList().toArray());
    }
    return ArrayUtils.EMPTY_OBJECT_ARRAY;
  }
  if (parentElement instanceof IProjectPO) {
    IProjectPO project=(IProjectPO)parentElement;
    List<Object> elements=new ArrayList<Object>();
    elements.addAll(project.getSpecObjCont().getSpecObjList());
    elements.addAll(project.getUsedProjects());
    return elements.toArray();
  }
  if (parentElement instanceof INodePO) {
    INodePO parentNode=((INodePO)parentElement);
    Object[] children=parentNode.getUnmodifiableNodeList().toArray();
    if (parentElement instanceof ISpecTestCasePO) {
      children=ArrayUtils.addAll(Collections.unmodifiableCollection(((ISpecTestCasePO)parentElement).getAllEventEventExecTC()).toArray(),children);
    }
    return children;
  }
  if (parentElement instanceof IReusedProjectPO) {
    try {
      IProjectPO reusedProject=ProjectPM.loadReusedProjectInMasterSession((IReusedProjectPO)parentElement);
      if (reusedProject != null) {
        return reusedProject.getSpecObjCont().getSpecObjList().toArray();
      }
      return ArrayUtils.EMPTY_OBJECT_ARRAY;
    }
 catch (    JBException e) {
      Utils.createMessageDialog(e,null,null);
      return ArrayUtils.EMPTY_OBJECT_ARRAY;
    }
  }
  return ArrayUtils.EMPTY_OBJECT_ARRAY;
}

Fixed version (ground truth):
/** 
 * {@inheritDoc}
 * @param parentElement Object
 * @return object array
 */
public Object[] getChildren(Object parentElement){
  if (parentElement instanceof IProjectPO[]) {
    return new Object[]{((IProjectPO[])parentElement)[0]};
  }
  if (parentElement instanceof IProjectPO) {
    IProjectPO project=(IProjectPO)parentElement;
    List<Object> elements=new ArrayList<Object>();
    elements.addAll(project.getSpecObjCont().getSpecObjList());
    elements.addAll(project.getUsedProjects());
    return elements.toArray();
  }
  if (parentElement instanceof IExecTestCasePO) {
    ISpecTestCasePO referencedTestCase=((IExecTestCasePO)parentElement).getSpecTestCase();
    if (referencedTestCase != null) {
      return ArrayUtils.addAll(Collections.unmodifiableCollection(referencedTestCase.getAllEventEventExecTC()).toArray(),referencedTestCase.getUnmodifiableNodeList().toArray());
    }
    return ArrayUtils.EMPTY_OBJECT_ARRAY;
  }
  if (parentElement instanceof INodePO) {
    INodePO parentNode=((INodePO)parentElement);
    Object[] children=parentNode.getUnmodifiableNodeList().toArray();
    if (parentElement instanceof ISpecTestCasePO) {
      children=ArrayUtils.addAll(Collections.unmodifiableCollection(((ISpecTestCasePO)parentElement).getAllEventEventExecTC()).toArray(),children);
    }
    return children;
  }
  if (parentElement instanceof IReusedProjectPO) {
    try {
      IProjectPO reusedProject=ProjectPM.loadReusedProjectInMasterSession((IReusedProjectPO)parentElement);
      if (reusedProject != null) {
        return reusedProject.getSpecObjCont().getSpecObjList().toArray();
      }
      return ArrayUtils.EMPTY_OBJECT_ARRAY;
    }
 catch (    JBException e) {
      Utils.createMessageDialog(e,null,null);
      return ArrayUtils.EMPTY_OBJECT_ARRAY;
    }
  }
  return ArrayUtils.EMPTY_OBJECT_ARRAY;
}