Program: 92894
Project: 92894
Buggy source:
@Override public boolean performDrop(Object data){
  Object target=getCurrentTarget();
  ITmfProjectTreeNode node=(TmfProjectTreeNode)target;
  while (node != null && !(node instanceof TmfProjectNode)) {
    node=node.getParent();
  }
  IFolder targetFolder=((TmfProjectNode)node).getTracesFolder().getFolder();
  if (data instanceof String[]) {
    System.out.println("String_Node_Str" + ((String[])data)[0]);
    System.out.println("String_Node_Str" + targetFolder);
    for (    String path : (String[])data) {
      File sourceFile=new File(path);
      if (sourceFile.isFile()) {
        IFile file=targetFolder.getFile(path.substring(path.lastIndexOf(File.separator)));
        try {
          file.createLink(sourceFile.toURI(),IResource.NONE,null);
          ITmfTrace trace=ParserProviderManager.getTrace(file);
          if (trace != null) {
            trace.dispose();
          }
        }
 catch (        CoreException e) {
          e.printStackTrace();
        }
      }
    }
  }
 else   if (data instanceof IResource[]) {
    System.out.println("String_Node_Str" + ((IResource[])data)[0].getName());
    System.out.println("String_Node_Str" + targetFolder);
    for (    IResource resource : (IResource[])data) {
      if (resource instanceof IFile) {
        IFile file=targetFolder.getFile(resource.getName());
        try {
          file.createLink(resource.getLocation(),IResource.NONE,null);
          String parser=resource.getPersistentProperty(ParserProviderManager.PARSER_PROPERTY);
          file.setPersistentProperty(ParserProviderManager.PARSER_PROPERTY,parser);
        }
 catch (        CoreException e) {
          e.printStackTrace();
        }
      }
    }
  }
  return true;
}

Fixed version (ground truth):
@Override public boolean performDrop(Object data){
  Object target=getCurrentTarget();
  ITmfProjectTreeNode node=(TmfProjectTreeNode)target;
  while (node != null && !(node instanceof TmfProjectNode)) {
    node=node.getParent();
  }
  IFolder targetFolder=((TmfProjectNode)node).getTracesFolder().getFolder();
  if (data instanceof String[]) {
    for (    String path : (String[])data) {
      File sourceFile=new File(path);
      if (sourceFile.isFile()) {
        IFile file=targetFolder.getFile(path.substring(path.lastIndexOf(File.separator)));
        try {
          file.createLink(sourceFile.toURI(),IResource.NONE,null);
          ITmfTrace trace=ParserProviderManager.getTrace(file);
          if (trace != null) {
            trace.dispose();
          }
        }
 catch (        CoreException e) {
          e.printStackTrace();
        }
      }
    }
  }
 else   if (data instanceof IResource[]) {
    for (    IResource resource : (IResource[])data) {
      if (resource instanceof IFile) {
        IFile file=targetFolder.getFile(resource.getName());
        try {
          file.createLink(resource.getLocation(),IResource.NONE,null);
          String parser=resource.getPersistentProperty(ParserProviderManager.PARSER_PROPERTY);
          file.setPersistentProperty(ParserProviderManager.PARSER_PROPERTY,parser);
        }
 catch (        CoreException e) {
          e.printStackTrace();
        }
      }
    }
  }
  return true;
}