I am trying to get the issues from mantisbugtracker via mantisbug tracker rest api using java.but i am getting the error like below.

    import java.net.URL;
    import org.apache.axis.session.Session;
    import org.mantisbt.connect.IMCSession;
    import org.mantisbt.connect.axis.MCSession;
    import org.mantisbt.connect.axis.Proxy;
    import org.mantisbt.connect.model.IIssue;
    import org.mantisbt.connect.model.IProject;
    import org.mantisbt.connect.model.Issue;
    public class getIssue {
    public static void main(String[] args) {
    // TODO Auto-generated method stub
    try
    {
    URL url = new URL("http://MansticServerAsdress/mantis/api/soap/mantisconnect.php");        String user = "XXXX";
    String pwd = "XXXX";
    String projectName="banking1";
    //Proxy.configure("localhost", 80);
    IMCSession session=new MCSession(url, user, pwd);
    System.out.println(session.toString());
    IProject [] projects=session.getAccessibleProjects();
    for(IProject project:projects)
    {
    if(projectName.equalsIgnoreCase(project.getName()))
    {
    System.out.println(project.getName()+"::"+project.getId());
    break;
    }
    }
    System.out.println(session.getAccessibleProjects());
    long issues = session.getBiggestIssueId(33);
    System.out.println(issues);

    //For getting Issue
    IIssue issue=session.getIssue(issues);
    System.out.println(issue.toString());
            }
    catch(Exception e)
    {
    e.printStackTrace();
    }
    }
    }
   // Exception:
------------------------------------------------------
org.mantisbt.connect.axis.MCSession@20398b7c
banking1::33
[Lorg.mantisbt.connect.axis.Project;@4fb64261
2430
- Exception:
org.xml.sax.SAXException: Invalid element in org.mantisbt.connect.axis.AttachmentData - user_id
at org.apache.axis.encoding.ser.BeanDeserializer.onStartChild(BeanDeserializer.java:264)
at org.apache.axis.encoding.DeserializationContext.startElement(DeserializationContext.java:1035)
at org.apache.axis.message.SAX2EventRecorder.replay(SAX2EventRecorder.java:165)
at org.apache.axis.message.MessageElement.publishToHandler(MessageElement.java:1141)
at org.apache.axis.message.RPCElement.deserialize(RPCElement.java:236)
at org.apache.axis.message.RPCElement.getParams(RPCElement.java:384)
at org.apache.axis.client.Call.invoke(Call.java:2583)
at org.apache.axis.client.Call.invoke(Call.java:2482)
at org.apache.axis.client.Call.invoke(Call.java:1867)
at org.mantisbt.connect.axis.MantisConnectBindingStub.mc_issue_get(MantisConnectBindingStub.java:1684)
at org.mantisbt.connect.axis.MCSession.getIssue(MCSession.java:532)
at ib.mantis.getIssue.main(getIssue.java:41)
org.mantisbt.connect.MCException: org.xml.sax.SAXException: Invalid element in org.mantisbt.connect.axis.AttachmentData - user_id
at org.mantisbt.connect.axis.MCSession.getIssue(MCSession.java:535)
at ib.mantis.getIssue.main(getIssue.java:41)
Caused by: org.xml.sax.SAXException: Invalid element in org.mantisbt.connect.axis.AttachmentData - user_id
at org.apache.axis.AxisFault.makeFault(AxisFault.java:104)
at org.apache.axis.client.Call.invoke(Call.java:2586)
at org.apache.axis.client.Call.invoke(Call.java:2482)
at org.apache.axis.client.Call.invoke(Call.java:1867)
at org.mantisbt.connect.axis.MantisConnectBindingStub.mc_issue_get(MantisConnectBindingStub.java:1684)
at org.mantisbt.connect.axis.MCSession.getIssue(MCSession.java:532)
... 1 more
Caused by: org.xml.sax.SAXException: Invalid element in org.mantisbt.connect.axis.AttachmentData - user_id
at org.apache.axis.encoding.ser.BeanDeserializer.onStartChild(BeanDeserializer.java:264)
at org.apache.axis.encoding.DeserializationContext.startElement(DeserializationContext.java:1035)
at org.apache.axis.message.SAX2EventRecorder.replay(SAX2EventRecorder.java:165)
at org.apache.axis.message.MessageElement.publishToHandler(MessageElement.java:1141)
at org.apache.axis.message.RPCElement.deserialize(RPCElement.java:236)
at org.apache.axis.message.RPCElement.getParams(RPCElement.java:384)
at org.apache.axis.client.Call.invoke(Call.java:2583)
... 5 more