Program: 161879
Project: 161879
Buggy source:
public List<Triple> search(String subject,String predicate,String object){
  List<Triple> triples=new ArrayList<Triple>();
  BooleanQuery bq=new BooleanQuery();
  try {
    log.debug("String_Node_Str");
    if (subject != null && subject.equals("String_Node_Str")) {
    }
    if (subject != null) {
      TermQuery tq=new TermQuery(new Term(FIELD_NAME_SUBJECT,subject));
      bq.add(tq,BooleanClause.Occur.MUST);
    }
    if (predicate != null) {
      TermQuery tq=new TermQuery(new Term(FIELD_NAME_PREDICATE,predicate));
      bq.add(tq,BooleanClause.Occur.MUST);
    }
    if (object != null) {
      Query q=null;
      if (predicate.equals("String_Node_Str") || predicate.equals("String_Node_Str")) {
        Analyzer analyzer=new SimpleAnalyzer(Version.LUCENE_44);
        MultiFieldQueryParser parser=new MultiFieldQueryParser(Version.LUCENE_44,new String[]{"String_Node_Str","String_Node_Str"},analyzer);
        parser.setDefaultOperator(QueryParser.Operator.OR);
        q=parser.parse(QueryParser.escape(object));
      }
 else {
        q=new TermQuery(new Term("String_Node_Str",object));
        bq.add(q,BooleanClause.Occur.MUST);
        q=new TermQuery(new Term("String_Node_Str",object));
      }
      bq.add(q,BooleanClause.Occur.MUST);
    }
    TopScoreDocCollector collector=TopScoreDocCollector.create(numberOfDocsRetrievedFromIndex,true);
    isearcher.search(bq,collector);
    ScoreDoc[] hits=collector.topDocs().scoreDocs;
    for (int i=0; i < hits.length; i++) {
      Document hitDoc=isearcher.doc(hits[i].doc);
      String s=hitDoc.get(FIELD_NAME_SUBJECT);
      String p=hitDoc.get(FIELD_NAME_PREDICATE);
      String o=null;
      if (hitDoc.get("String_Node_Str") != null) {
        o=hitDoc.get("String_Node_Str");
      }
      if (hitDoc.get("String_Node_Str") != null) {
        o=hitDoc.get("String_Node_Str");
      }
      Triple triple=new Triple(s,p,o);
      triples.add(triple);
    }
    log.debug("String_Node_Str");
  }
 catch (  Exception e) {
    log.error(e.getLocalizedMessage() + "String_Node_Str" + subject);
  }
  return triples;
}

Fixed version (ground truth):
public List<Triple> search(String subject,String predicate,String object){
  List<Triple> triples=new ArrayList<Triple>();
  BooleanQuery bq=new BooleanQuery();
  try {
    log.debug("String_Node_Str");
    if (subject != null && subject.equals("String_Node_Str")) {
    }
    if (subject != null) {
      TermQuery tq=new TermQuery(new Term(FIELD_NAME_SUBJECT,subject));
      bq.add(tq,BooleanClause.Occur.MUST);
    }
    if (predicate != null) {
      TermQuery tq=new TermQuery(new Term(FIELD_NAME_PREDICATE,predicate));
      bq.add(tq,BooleanClause.Occur.MUST);
    }
    if (object != null) {
      Query q=null;
      if ("String_Node_Str".equals(predicate) || "String_Node_Str".equals(predicate)) {
        Analyzer analyzer=new SimpleAnalyzer(Version.LUCENE_44);
        MultiFieldQueryParser parser=new MultiFieldQueryParser(Version.LUCENE_44,new String[]{"String_Node_Str","String_Node_Str"},analyzer);
        parser.setDefaultOperator(QueryParser.Operator.OR);
        q=parser.parse(QueryParser.escape(object));
      }
 else {
        q=new TermQuery(new Term("String_Node_Str",object));
        bq.add(q,BooleanClause.Occur.MUST);
        q=new TermQuery(new Term("String_Node_Str",object));
      }
      bq.add(q,BooleanClause.Occur.MUST);
    }
    TopScoreDocCollector collector=TopScoreDocCollector.create(numberOfDocsRetrievedFromIndex,true);
    isearcher.search(bq,collector);
    ScoreDoc[] hits=collector.topDocs().scoreDocs;
    for (int i=0; i < hits.length; i++) {
      Document hitDoc=isearcher.doc(hits[i].doc);
      String s=hitDoc.get(FIELD_NAME_SUBJECT);
      String p=hitDoc.get(FIELD_NAME_PREDICATE);
      String o=null;
      if (hitDoc.get("String_Node_Str") != null) {
        o=hitDoc.get("String_Node_Str");
      }
      if (hitDoc.get("String_Node_Str") != null) {
        o=hitDoc.get("String_Node_Str");
      }
      Triple triple=new Triple(s,p,o);
      triples.add(triple);
    }
    log.debug("String_Node_Str");
  }
 catch (  Exception e) {
    log.error(e.getLocalizedMessage() + "String_Node_Str" + subject);
  }
  return triples;
}