Program: 144299
Project: 144299
Buggy source:
/** 
 * Loads edges and their properties from the csv files
 * @param dir     Directory in which the files reside
 * @param eMap    Map between edge description triples (FromVertexType.EdgeLabel.ToVertexType) nd expected filenames
 * @throws IOException              if has trouble reading the file
 * @throws SchemaViolationException if file doesn't match the expected schema according to the workload definition
 */
private void loadEdges(File dir,Map<String,String> eMap) throws IOException, SchemaViolationException {
  logger.info("String_Node_Str");
  WorkLoadSchema s=this.workload.getSchema();
  for (  Map.Entry<String,String> ent : eMap.entrySet()) {
    HashSet<String> fileSet=new HashSet<>();
    final String fNamePrefix=ent.getKey().replace("String_Node_Str","String_Node_Str");
    fileSet.addAll(Arrays.asList(dir.list(new FilenameFilter(){
      @Override public boolean accept(      File dir,      String name){
        return name.matches(fNamePrefix + "String_Node_Str");
      }
    }
)));
    for (    String fName : fileSet) {
      logger.info("String_Node_Str",fName);
      BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(new File(dir,fName)),"String_Node_Str"));
      String line=br.readLine();
      if (line == null)       throw new IOException("String_Node_Str" + fName);
      String[] header=line.split(CSVSPLIT);
      try {
        validateEHeader(s,ent.getKey(),header);
      }
 catch (      SchemaViolationException e) {
        br.close();
        throw e;
      }
      int rowLength=header.length;
      String eLabel=ent.getKey().split(TUPLESPLIT)[1];
      JanusGraphTransaction transaction=graph.newTransaction();
      try {
        int counter=0;
        while ((line=br.readLine()) != null) {
          if (counter % 100 == 0) {
            logger.info("String_Node_Str" + counter);
          }
          String[] row=line.split(CSVSPLIT);
          if (row.length < 2 || row[0].equals("String_Node_Str") || row[1].equals("String_Node_Str")) {
            br.close();
            graph.close();
            throw new NumberFormatException("String_Node_Str" + fName + "String_Node_Str"+ Arrays.toString(row));
          }
          Long idTail=Long.parseLong(row[0]);
          Long idHead=Long.parseLong(row[1]);
          Vertex tail=graph.traversal().V().has(header[0],idTail).next();
          Vertex head=graph.traversal().V().has(header[1],idHead).next();
          Edge edge=tail.addEdge(eLabel,head);
          for (int i=2; i < row.length; i++) {
            edge.property(eLabel + "String_Node_Str" + header[i],parseEntry(row[i],s.getEPropertyClass(eLabel,header[i]).getSimpleName()));
          }
          counter++;
        }
      }
 catch (      Exception e) {
        logger.error("String_Node_Str",ent.getKey(),line);
        br.close();
        graph.close();
        e.printStackTrace();
      }
 finally {
        br.close();
      }
      transaction.commit();
    }
    logger.info("String_Node_Str",ent.getKey());
  }
  logger.info("String_Node_Str");
}

Fixed version (ground truth):
/** 
 * Loads edges and their properties from the csv files
 * @param dir     Directory in which the files reside
 * @param eMap    Map between edge description triples (FromVertexType.EdgeLabel.ToVertexType) nd expected filenames
 * @throws IOException              if has trouble reading the file
 * @throws SchemaViolationException if file doesn't match the expected schema according to the workload definition
 */
private void loadEdges(File dir,Map<String,String> eMap) throws IOException, SchemaViolationException {
  logger.info("String_Node_Str");
  WorkLoadSchema s=this.workload.getSchema();
  for (  Map.Entry<String,String> ent : eMap.entrySet()) {
    HashSet<String> fileSet=new HashSet<>();
    final String fNamePrefix=ent.getValue();
    fileSet.addAll(Arrays.asList(dir.list(new FilenameFilter(){
      @Override public boolean accept(      File dir,      String name){
        return name.matches(fNamePrefix + "String_Node_Str");
      }
    }
)));
    for (    String fName : fileSet) {
      logger.info("String_Node_Str",fName);
      BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(new File(dir,fName)),"String_Node_Str"));
      String line=br.readLine();
      if (line == null)       throw new IOException("String_Node_Str" + fName);
      String[] header=line.split(CSVSPLIT);
      try {
        validateEHeader(s,ent.getKey(),header);
      }
 catch (      SchemaViolationException e) {
        br.close();
        throw e;
      }
      int rowLength=header.length;
      String eLabel=ent.getKey().split(TUPLESPLIT)[1];
      JanusGraphTransaction transaction=graph.newTransaction();
      try {
        int counter=0;
        while ((line=br.readLine()) != null) {
          if (counter % 100 == 0) {
            logger.info("String_Node_Str" + counter);
          }
          String[] row=line.split(CSVSPLIT);
          if (row.length < 2 || row[0].equals("String_Node_Str") || row[1].equals("String_Node_Str")) {
            br.close();
            graph.close();
            throw new NumberFormatException("String_Node_Str" + fName + "String_Node_Str"+ Arrays.toString(row));
          }
          Long idTail=Long.parseLong(row[0]);
          Long idHead=Long.parseLong(row[1]);
          Vertex tail=graph.traversal().V().has(header[0],idTail).next();
          Vertex head=graph.traversal().V().has(header[1],idHead).next();
          Edge edge=tail.addEdge(eLabel,head);
          for (int i=2; i < row.length; i++) {
            edge.property(eLabel + "String_Node_Str" + header[i],parseEntry(row[i],s.getEPropertyClass(eLabel,header[i]).getSimpleName()));
          }
          counter++;
        }
      }
 catch (      Exception e) {
        logger.error("String_Node_Str",ent.getKey(),line);
        br.close();
        graph.close();
        e.printStackTrace();
      }
 finally {
        br.close();
      }
      transaction.commit();
    }
    logger.info("String_Node_Str",ent.getKey());
  }
  logger.info("String_Node_Str");
}