Program: 126554
Project: 126554
Buggy source:
/** 
 * Return <code>true</code> if the lock could be acquired.
 * @param shell
 * @throws IOException
 */
private boolean acquireWorkspaceLock(Shell shell){
  Location instanceLoc=Platform.getInstanceLocation();
  ConnectionUserPerReader perReader=ConnectionUserPerReader.getInstance();
  if (perReader.isHaveUserPer() && instanceLoc != null && !instanceLoc.isSet()) {
    try {
      String lastWorkSpacePath=perReader.readLastWorkSpace();
      if (!"String_Node_Str".equals(lastWorkSpacePath) && lastWorkSpacePath != null) {
        File file=new File(lastWorkSpacePath);
        boolean needSet=true;
        if (instanceLoc.isSet()) {
          File curWorkspace=URIUtil.toFile(URIUtil.toURI(instanceLoc.getURL()));
          if (file.equals(curWorkspace)) {
            needSet=false;
          }
        }
        if (needSet) {
          if (!file.exists()) {
            boolean mkdirs=file.mkdirs();
            if (!mkdirs) {
              MessageDialog.openError(shell,Messages.getString("String_Node_Str"),Messages.getString("String_Node_Str"));
              perReader.saveConnections(null);
              return true;
            }
          }
          instanceLoc.set(file.toURL(),false);
        }
      }
    }
 catch (    MalformedURLException e) {
      ExceptionHandler.process(e);
    }
catch (    URISyntaxException e) {
      ExceptionHandler.process(e);
    }
catch (    IllegalStateException e) {
      ExceptionHandler.process(e);
    }
catch (    IOException e) {
      ExceptionHandler.process(e);
    }
  }
  if (instanceLoc == null || instanceLoc.getURL() == null) {
    return true;
  }
  if (instanceLoc.isSet()) {
    try {
      if (instanceLoc.lock()) {
        return true;
      }
    }
 catch (    Throwable t) {
    }
  }
  return false;
}

Fixed version (ground truth):
/** 
 * Return <code>true</code> if the lock could be acquired.
 * @param shell
 * @throws IOException if lock acquisition fails somehow
 */
private boolean acquireWorkspaceLock(Shell shell) throws IOException {
  Location instanceLoc=Platform.getInstanceLocation();
  ConnectionUserPerReader perReader=ConnectionUserPerReader.getInstance();
  if (perReader.isHaveUserPer() && instanceLoc != null && !instanceLoc.isSet()) {
    try {
      String lastWorkSpacePath=perReader.readLastWorkSpace();
      if (!"String_Node_Str".equals(lastWorkSpacePath) && lastWorkSpacePath != null) {
        File file=new File(lastWorkSpacePath);
        boolean needSet=true;
        if (instanceLoc.isSet()) {
          File curWorkspace=URIUtil.toFile(URIUtil.toURI(instanceLoc.getURL()));
          if (file.equals(curWorkspace)) {
            needSet=false;
          }
        }
        if (needSet) {
          if (!file.exists()) {
            boolean mkdirs=file.mkdirs();
            if (!mkdirs) {
              MessageDialog.openError(shell,Messages.getString("String_Node_Str"),Messages.getString("String_Node_Str"));
              perReader.saveConnections(null);
              return true;
            }
          }
          instanceLoc.set(file.toURL(),false);
        }
      }
    }
 catch (    MalformedURLException e) {
      ExceptionHandler.process(e);
    }
catch (    URISyntaxException e) {
      ExceptionHandler.process(e);
    }
catch (    IllegalStateException e) {
      ExceptionHandler.process(e);
    }
  }
  if (instanceLoc == null || instanceLoc.getURL() == null) {
    return true;
  }
  if (!instanceLoc.isSet()) {
    try {
      instanceLoc.set(instanceLoc.getDefault(),false);
    }
 catch (    IllegalStateException e) {
      ExceptionHandler.process(e);
    }
  }
  if (instanceLoc.isLocked()) {
    return false;
  }
 else {
    return instanceLoc.lock();
  }
}