[mapguide-users] Mapguide JavaAjaxViewer Update Features Memory Leak?

[jjdoc]

Hi,
   I'm trying to repeatedly update a feature in one of the resources using
Ajax Java Viewer and custom Java code. After about 10-20min, the Mapguide
server will reach 200MB memory usage and fail, throwing the following
exception:

<2010-12-10T22:44:48> 	3624	Ajax Viewer	127.0.0.1	Anonymous
 Error: Cannot create any more connections to the OSGeo.SHP FDO provider.
 StackTrace:
  - MgFeatureServiceHandler.ProcessOperation() line 83 file
c:\osgeo\mapguide_21\mgdev\server\src\services\feature\FeatureServiceHandler.cpp
  - MgOpUpdateFeatures.Execute() line 111 file
c:\osgeo\mapguide_21\mgdev\server\src\services\feature\OpUpdateFeatures.cpp
  - MgServerUpdateFeatures.UpdateFeatures() line 128 file
c:\osgeo\mapguide_21\mgdev\server\src\services\feature\ServerUpdateFeatures.cpp
  - MgFdoConnectionManager.Open() line 259 file
c:\osgeo\mapguide_21\mgdev\server\src\common\manager\FdoConnectionManager.cpp	

Looks like it runs out of connections to the feature service.
I read some previous messages related to this issue,and the suggestion was
to use Dispose() on all services and resources when done in one iteration.
However, I can't find this method in the Java API for services or
resourceIdentifiers. Below is my test code. It is trying to update the Name
attribute of the Park resource to a value of "nowa3". this jsp page will be
called repeatedly from UI:


<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ page import="org.osgeo.mapguide.*" %>
<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.text.*" %>
<%@ page import="javax.servlet.jsp.*" %>
<%@ page import="javax.servlet.http.*" %>
<%@ include file ="utilityfunctions.jsp" %>
<%!
String mapName = "";
String sessionId = "";
String selText = "";
boolean queryInfo;
%>

<%

System.out.println("In dynamic update.\n");
response.setContentType("text/xml; charset=UTF-8");

request.setCharacterEncoding("UTF-8");
mapName = sessionId = selText = "";
queryInfo = false;

//fetch the parameters for this request
//
//GetRequestParameters(request);
mapName="basemap";
sessionId = request.getParameter("SESSION");
MgResourceIdentifier resId=null;
try
{
       System.out.println("here-4.");
    InitializeWebTier();
       System.out.println("here-3.");
    MgUserInformation cred = new MgUserInformation(sessionId);
    cred.SetClientIp(GetClientIp(request));
    cred.SetClientAgent(GetClientAgent());

       System.out.println("here-2.");
    //connect to the site and get an instance of the resource service
    //
    MgSiteConnection site = new MgSiteConnection();
    site.Open(cred);
    MgResourceService resourceSrvc =
(MgResourceService)site.CreateService(MgServiceType.ResourceService);
    MgFeatureService featureService =
(MgFeatureService)site.CreateService(MgServiceType.FeatureService);

       System.out.println("here-1.");
    //load the map runtime state
    //
    MgMap map = new MgMap();
    map.Open(resourceSrvc, mapName);
       System.out.println("here0.");

      resId = new
MgResourceIdentifier("Library://test/Data/Park.FeatureSource");
       
      String filter = "Name like '%'" ;
      System.out.println("here.");
      
	MgFeatureCommandCollection commands = new MgFeatureCommandCollection();

        MgPropertyCollection properties = new MgPropertyCollection();

        String name = "nowa3";
        properties.Add(new MgStringProperty("Name",name ));


        MgUpdateFeatures updateCommandRed = new MgUpdateFeatures("Park",
properties, filter);
                                       
        commands.Add(updateCommandRed);
       

        //exceute commands
        if (commands.GetCount() >=1 )
        {

	System.out.println("Issueing commands.");
        ReleaseReader(featureService.UpdateFeatures(resId, commands, false),
commands);
	//featureService.UpdateFeatures(resId, commands, false);
                       
        }
              System.out.println("here2.");
        //Now test if name has changed:
       
        MgFeatureQueryOptions queryOptions = new MgFeatureQueryOptions();
        queryOptions.SetFilter(filter);
       
                     System.out.println("here3.");
        MgFeatureReader featureReader = featureService.SelectFeatures(resId,
"Park", queryOptions);
                       
               
                             System.out.println("here4.");
	int i = 0;
        while (featureReader.ReadNext())
        {

	       i++;
       		int propCount = featureReader.GetPropertyCount();
       		for(int j=0; j<propCount; j++)
       		{
           		String propertyName = featureReader.GetPropertyName(j);
	   		System.out.println("prop " + propertyName + ", type=" +
featureReader.GetPropertyType(propertyName));
		}
	        String newname = featureReader.GetString("Name");
                System.out.println("Name=" + newname);
        	   //String id = featureReader.GetString("Id");
          	// out.write("Name after changing:"  + newname);
          	// out.write("Id :"  + id);
        	
	}
          System.out.println("here5.");
	//featureService.Dispose();

} catch (Exception ex) {
ex.printStackTrace();
} finally {
	//resId.Dispose();
}
%>

Any help is apprecated. I am using Mapguide 2.1.0
Thanks.
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