NullPointerException when using array of string in Java

I use an API to segment the text into sentences. In the future I want to retrieve each sentence in a case of an array of string.

Code:

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String [] tab = null;
  for (int i=0; i<annotations.size() i++) {
                                  Annotation annotation = annotations. Get (i);
  if (annotation!= null && (annotation.getType().equals ("Sentence"))) {
  DocumentContent content = currDoc.GetContent();
      Node = startNode annotation.GetStartNode();
        Node = endNode annotation.GetEndNode();
        long start = startNode.getOffset();
        long end = endNode.getOffset();
  tab [i] = content. getContent (start, end). toString ();
  }

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This Code generates an exception: Exception in thread "main" java.lang.NullPointerException.

Note that this same code works fine by putting

Code:

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System. Out. Println (i + ":" + content. GetContent (start, end). ToString ());

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Quote:

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Originally Posted by Sean J

This Code generates an exception: Exception in thread "main" java.lang.NullPointerException.

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You manipulating a null at line mentioned in your exception.

The problem comes from

Code:

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String [] tab = null;

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or rather that you had not initialized tab.

Code:

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String [] tab = new String [annotations.size ()]

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should solve the problem.