Program: 10911
Project: 10911
Buggy source:
protected void activateMedia(String contentPath,MediaElement... mediaElements){
synchronized (this) {
    Assert.isTrue(state == STATE.HANDLING,"String_Node_Str" + state + "String_Node_Str",10001);
    state=STATE.STARTING;
  }
  boolean mediaElementProvided=mediaElements != null & mediaElements.length > 0;
  Assert.isTrue(mediaElementProvided || contentPath == null,"String_Node_Str",10002);
  Assert.isTrue(mediaElementProvided || contentPath != null,"String_Node_Str",10003);
  getLogger().info("String_Node_Str" + this.getClass().getSimpleName() + "String_Node_Str"+ contentPath);
  if (contentPath != null) {
    mediaElements=new MediaElement[1];
    mediaElements[0]=buildRepositoryBasedMediaElement(contentPath);
  }
  HttpEndPoint httpEndPoint=buildAndConnectHttpEndPointMediaElement(mediaElements);
  boolean terminate=false;
synchronized (this) {
    if (state == STATE.TERMINATED) {
      terminate=true;
    }
 else     if (state == STATE.STARTING) {
      state=STATE.ACTIVE;
    }
  }
  if (terminate) {
    getLogger().info("String_Node_Str");
    return;
  }
  String answerUrl=null;
  try {
    answerUrl=httpEndPoint.getUrl();
    getLogger().info("String_Node_Str" + answerUrl);
  }
 catch (  IOException ioe) {
    throw new KurentoMediaFrameworkException("String_Node_Str" + ioe.getMessage(),ioe,20006);
  }
  Assert.notNull(answerUrl,"String_Node_Str",20012);
  Assert.isTrue(answerUrl.length() > 0,"String_Node_Str",20012);
  getLogger().info("String_Node_Str" + answerUrl);
  httpEndPoint.addListener(new MediaEventListener<HttpEndPointEvent>(){
    @Override public void onEvent(    HttpEndPointEvent event){
    }
  }
);
  if (useControlProtocol) {
    answerActivateMediaRequest4JsonControlProtocolConfiguration(answerUrl);
  }
 else {
    answerActivateMediaRequest4SimpleHttpConfiguration(answerUrl);
  }
}

Fixed version (ground truth):
protected void activateMedia(String contentPath,MediaElement... mediaElements){
synchronized (this) {
    Assert.isTrue(state == STATE.HANDLING,"String_Node_Str" + state + "String_Node_Str",10001);
    state=STATE.STARTING;
  }
  final boolean mediaElementProvided=mediaElements != null && mediaElements.length > 0;
  final boolean contentPathProvided=contentPath != null;
  Assert.isTrue(mediaElementProvided || contentPathProvided,"String_Node_Str",10002);
  Assert.isTrue(!(mediaElementProvided && contentPathProvided),"String_Node_Str",10003);
  getLogger().info("String_Node_Str" + this.getClass().getSimpleName() + "String_Node_Str"+ contentPath);
  if (contentPath != null) {
    mediaElements=new MediaElement[1];
    mediaElements[0]=buildRepositoryBasedMediaElement(contentPath);
  }
  HttpEndPoint httpEndPoint=buildAndConnectHttpEndPointMediaElement(mediaElements);
  boolean terminate=false;
synchronized (this) {
    if (state == STATE.TERMINATED) {
      terminate=true;
    }
 else     if (state == STATE.STARTING) {
      state=STATE.ACTIVE;
    }
  }
  if (terminate) {
    getLogger().info("String_Node_Str");
    return;
  }
  String answerUrl=null;
  try {
    answerUrl=httpEndPoint.getUrl();
    getLogger().info("String_Node_Str" + answerUrl);
  }
 catch (  IOException ioe) {
    throw new KurentoMediaFrameworkException("String_Node_Str" + ioe.getMessage(),ioe,20006);
  }
  Assert.notNull(answerUrl,"String_Node_Str",20012);
  Assert.isTrue(answerUrl.length() > 0,"String_Node_Str",20012);
  getLogger().info("String_Node_Str" + answerUrl);
  httpEndPoint.addListener(new MediaEventListener<HttpEndPointEvent>(){
    @Override public void onEvent(    HttpEndPointEvent event){
    }
  }
);
  if (useControlProtocol) {
    answerActivateMediaRequest4JsonControlProtocolConfiguration(answerUrl);
  }
 else {
    answerActivateMediaRequest4SimpleHttpConfiguration(answerUrl);
  }
}