how not to insert more than two sequential nextval value? - spring

Question

I'm using spring framework and oracle DB for the Web solution system.
The problem is when I call the web page related on oracle sequence,
sometimes more than two rows are inserted on the DB table.
That rows has not duplicated values but increased values from sequence.
Also I already checked the java code,
but I didn't use the loop or for sentences or call twice insert sentences.
Is that occurred often?
and how can I solve the problem?
Do I have to add the code for checking value or make the oracle trigger on the table?
This is the code.
public void insertDefaultLParameter(HttpServletRequest request, String workflowId) throws Exception{
String newLParaId = mapper.getNewLParaId();
HashMap<String, String> condition = new HashMap<String, String>();
condition.put("newLParaId", newLParaId);
condition.put("paraValue", "2013-05");
condition.put("workflowId", workflowId);
mapper.insertLParameter(condition);
mapper.insertLParameterMapping(condition);
}
"getNewLParaId()" called the sequence "MT_L_PARA_MAPPING_SEQ" like the below sql.
SELECT 'LPARA' || LPAD(MT_L_PARA_MAPPING_SEQ.nextval,10,0) FROM DUAL
After getting the value, the value is inserted into two tables through "insertLParameter" and "insertLParameterMapping" mapping id.
And the below is the code which call "insertDefaultLParameter" class.
See the bottom of the code.
You can find "rfmService.insertDefaultLParameter(request, praWfId);".
#RequestMapping(value="/insertWorkflowInfo", method=RequestMethod.POST, headers="Accept=application/json")
public ModelAndView insertWorkflowDetail(Locale locae, Model model, HttpServletRequest request) throws Exception{
HttpSession session = request.getSession(false);
User user = (User)session.getAttribute("user");
String userId = user.getUserId();
String workflowNm = "";
String alsPpsCd = "";
String workflowDesc = "";
String pid = "";
String plevel = "";
if(request.getParameter("workflowNm") != null || !request.getParameter("workflowNm").equals("")) workflowNm = request.getParameter("workflowNm");
if(request.getParameter("alsPpsCd") != null || !request.getParameter("alsPpsCd").equals("")) alsPpsCd = request.getParameter("alsPpsCd");
if(request.getParameter("workflowDesc") != null || !request.getParameter("workflowDesc").equals("")) workflowDesc = request.getParameter("workflowDesc");
if(request.getParameter("pid") != null || !request.getParameter("pid").equals("")) pid = request.getParameter("pid");
if(request.getParameter("plevel") != null || !request.getParameter("plevel").equals("")) plevel = request.getParameter("plevel");
//0.
//HashMap<String,String> treeMgtInfo = new HashMap<String,String>();
//treeMgtInfo.put("treeId",pid);
//
HashMap<String,String> input = new HashMap<String,String>();
//2.
String praWfId = wfService.selectPraWfid();
input.put("praWfId", praWfId);
input.put("wfNm",workflowNm);
input.put("wfDesc", SecurityUtil.removeXSS(workflowDesc));
input.put("alsPpsCd",alsPpsCd);
input.put("usrId",userId);
input.put("rgUsrId",userId);
// 1.
wfService.insertWorkflowDetail(input);
input.put("treeNm",workflowNm);
//
int treeLevCd = new Integer(plevel) +1 ;
input.put("treeLevCd",""+treeLevCd);
input.put("treeBjCd",Constant.TREE_BJ_CD_WORKFLOW);
input.put("treeCd",Constant.TREE_CD_WORKFLOW);
//
input.put("treeLrkRufId",praWfId);
input.put("upTreeId",pid);
//
int sceXrsSeqVl = treeService.selectSceXrsSeqId(input);
input.put("sceXrsSeqVl",""+sceXrsSeqVl);
String treeId = treeService.selectTreeIdInfo();
input.put("treeId",treeId);
// 2.
rfmService.insertDefaultLParameter(request, praWfId);
// 3.
treeService.insertTreeMgtInfoWithId(input);
ModelAndView modelAndView=new ModelAndView("defaultViews");
modelAndView.addObject("treeId",treeId);
modelAndView.addObject("praWfId",praWfId);
return modelAndView;
}
This is all of code related on the sequence.