title: Exception in thread "main" java.lang.Error.unresolved compilation
body: <p>After adding my own jars, I tried to run my code, but appeared this message:</p>
  
  <blockquote>
    <p>Exception in thread "main" java.lang.Error.unresolved compilation problem: at TestCoreNLP.main(TestCoreNLP.java:26).</p>
  </blockquote>
  
  <hr>
  
  <pre><code>package Test;public class TestCoreNLP {
  public static void main(String[] args) {
      // creates a StanfordCoreNLP object, with POS tagging, lemmatization, NER, parsing, and coreference resolution
      Properties props = new Properties();
      props.put("annotators", "tokenize, ssplit, pos, lemma, ner, parse, dcoref");
      StanfordCoreNLP pipeline = new StanfordCoreNLP(props); // read some text in the text variable
      String text = "Add your text here:Beijing sings Lenovo";
  
      // create an empty Annotation just with the given text
      Annotation document = new Annotation(text);
  
      // run all Annotators on this text
      pipeline.annotate(document);
  
      // these are all the sentences in this document
      // a CoreMap is essentially a Map that uses class objects as keys and has values with custom types
      List&lt;CoreMap&gt; sentences = document.get(SentencesAnnotation.class);
  
      System.out.println("word\tpos\tlemma\tner");
      for(CoreMap sentence: sentences) {
           // traversing the words in the current sentence
           // a CoreLabel is a CoreMap with additional token-specific methods
          for (CoreLabel token: sentence.get(TokensAnnotation.class)) {
              // this is the text of the token
              String word = token.get(TextAnnotation.class);
              // this is the POS tag of the token
              String pos = token.get(PartOfSpeechAnnotation.class);
              // this is the NER label of the token
              String ne = token.get(NamedEntityTagAnnotation.class);
              String lemma = token.get(LemmaAnnotation.class);
  
              System.out.println(word+"\t"+pos+"\t"+lemma+"\t"+ne);
          }
          // this is the parse tree of the current sentence
          Tree tree = sentence.get(TreeAnnotation.class);
  
          // this is the Stanford dependency graph of the current sentence
          SemanticGraph dependencies = sentence.get(CollapsedCCProcessedDependenciesAnnotation.class);
      }
      // This is the coreference link graph
      // Each chain stores a set of mentions that link to each other,
      // along with a method for getting the most representative mention
      // Both sentence and token offsets start at 1!
      Map&lt;Integer, CorefChain&gt; graph = document.get(CorefChainAnnotation.class);
  }
  </code></pre>
  
  <p>}</p>