Program: 118074
Project: 118074
Buggy source:
private String generateNewQueryFromDQRuler(IElementParameter dqRulerParam){
  ITDQRuleService rulerService=null;
  try {
    rulerService=(ITDQRuleService)GlobalServiceRegister.getDefault().getService(ITDQRuleService.class);
  }
 catch (  RuntimeException e) {
  }
  if (rulerService != null) {
    IElementParameter typeParam=node.getElementParameter("String_Node_Str");
    IElementParameter dbParam=node.getElementParameter(EParameterName.DBNAME.getName());
    IElementParameter schemaParam=node.getElementParameter(EParameterName.SCHEMA_DB.getName());
    IElementParameter tableParam=node.getElementParameterFromField(EParameterFieldType.DBTABLE);
    IElementParameter whereClause=node.getElementParameter("String_Node_Str");
    List<IMetadataTable> metadataList=null;
    IMetadataTable metadataTable=null;
    if (node instanceof Node) {
      metadataList=((Node)node).getMetadataList();
      if (metadataList != null && !metadataList.isEmpty()) {
        metadataTable=metadataList.get(0);
      }
    }
    return rulerService.getQueryByRule(dqRulerParam,typeParam,dbParam,schemaParam,tableParam,metadataTable,node.getElementName().contains("String_Node_Str"),whereClause);
  }
  return "String_Node_Str";
}

Fixed version (ground truth):
private String generateNewQueryFromDQRuler(IElementParameter dqRulerParam){
  ITDQRuleService rulerService=null;
  try {
    rulerService=(ITDQRuleService)GlobalServiceRegister.getDefault().getService(ITDQRuleService.class);
  }
 catch (  RuntimeException e) {
  }
  if (rulerService != null) {
    IElementParameter existConnection=node.getElementParameter("String_Node_Str");
    boolean useExistConnection=(existConnection == null ? false : (Boolean)existConnection.getValue());
    INode connectionNode=null;
    if (node != null && node instanceof INode) {
      process=((INode)node).getProcess();
    }
    if (useExistConnection && process != null) {
      IElementParameter connector=node.getElementParameter("String_Node_Str");
      if (connector != null) {
        String connectorValue=connector.getValue().toString();
        List<? extends INode> graphicalNodes=process.getGeneratingNodes();
        for (        INode node : graphicalNodes) {
          if (node.getUniqueName().equals(connectorValue)) {
            connectionNode=node;
            break;
          }
        }
      }
    }
    IElementParameter typeParam=node.getElementParameter("String_Node_Str");
    IElementParameter dbParam=node.getElementParameter(EParameterName.DBNAME.getName());
    IContext lastRunContext=((IProcess2)process).getLastRunContext();
    String dbName=JavaProcessUtil.getRealParamValue(process,dbParam.getValue().toString(),lastRunContext);
    IElementParameter schemaParam=node.getElementParameter(EParameterName.SCHEMA_DB.getName());
    String schemaName=JavaProcessUtil.getRealParamValue(process,schemaParam == null ? org.apache.commons.lang.StringUtils.EMPTY : schemaParam.getValue().toString(),lastRunContext);
    IElementParameter tableParam=node.getElementParameterFromField(EParameterFieldType.DBTABLE);
    String tableName=JavaProcessUtil.getRealParamValue(process,tableParam.getValue().toString(),lastRunContext);
    IElementParameter whereClause=node.getElementParameter("String_Node_Str");
    String whereStr=org.apache.commons.lang.StringUtils.EMPTY;
    if (whereClause.getValue() != null) {
      whereStr=JavaProcessUtil.getRealParamValue(process,whereClause.getValue().toString(),lastRunContext);
    }
    if (connectionNode != null) {
      typeParam=connectionNode.getElementParameter("String_Node_Str");
      dbParam=connectionNode.getElementParameter(EParameterName.DBNAME.getName());
      dbName=JavaProcessUtil.getRealParamValue(process,dbParam.getValue().toString(),lastRunContext);
      schemaParam=connectionNode.getElementParameter(EParameterName.SCHEMA_DB.getName());
      schemaName=JavaProcessUtil.getRealParamValue(process,schemaParam == null ? org.apache.commons.lang.StringUtils.EMPTY : schemaParam.getValue().toString(),lastRunContext);
    }
    List<IMetadataTable> metadataList=null;
    IMetadataTable metadataTable=null;
    if (node instanceof Node) {
      metadataList=((Node)node).getMetadataList();
      if (metadataList != null && !metadataList.isEmpty()) {
        metadataTable=metadataList.get(0);
      }
    }
    return rulerService.getQueryByRule(dqRulerParam,typeParam,dbName,schemaName,tableName,metadataTable,node.getElementName().contains("String_Node_Str"),whereStr);
  }
  return org.apache.commons.lang.StringUtils.EMPTY;
}