Program: 69536
Project: 69536
Buggy source:
@Override protected void event(UserRequest ureq,Component source,Event event){
  if (source == startLink) {
    setTranslator(um.getPropertyHandlerTranslator(getTranslator()));
    userPropertyHandlers=um.getUserPropertyHandlersFor(usageIdentifyer,true);
    Step start=new ImportStep00(ureq,canCreateOLATPassword);
    StepRunnerCallback finish=new StepRunnerCallback(){
      public Step execute(      UserRequest ureq1,      WindowControl wControl1,      StepsRunContext runContext){
        ImportReport report=new ImportReport();
        runContext.put("String_Node_Str",report);
        try {
          if (runContext.containsKey("String_Node_Str") && ((Boolean)runContext.get("String_Node_Str")).booleanValue()) {
            int count=0;
            @SuppressWarnings("String_Node_Str") List<TransientIdentity> newIdents=(List<TransientIdentity>)runContext.get("String_Node_Str");
            for (            TransientIdentity newIdent : newIdents) {
              doCreateAndPersistIdentity(newIdent,report);
              if (++count % 10 == 0) {
                dbInstance.commitAndCloseSession();
              }
            }
            dbInstance.commitAndCloseSession();
            Boolean updateUsers=(Boolean)runContext.get("String_Node_Str");
            Boolean updatePasswords=(Boolean)runContext.get("String_Node_Str");
            @SuppressWarnings("String_Node_Str") List<UpdateIdentity> updateIdents=(List<UpdateIdentity>)runContext.get("String_Node_Str");
            for (            UpdateIdentity updateIdent : updateIdents) {
              doUpdateIdentity(updateIdent,updateUsers,updatePasswords,report);
              if (++count % 10 == 0) {
                dbInstance.commitAndCloseSession();
              }
            }
            dbInstance.commitAndCloseSession();
            @SuppressWarnings("String_Node_Str") List<Long> ownGroups=(List<Long>)runContext.get("String_Node_Str");
            @SuppressWarnings("String_Node_Str") List<Long> partGroups=(List<Long>)runContext.get("String_Node_Str");
            if ((ownGroups != null && ownGroups.size() > 0) || (partGroups != null && partGroups.size() > 0)) {
              @SuppressWarnings("String_Node_Str") List<Identity> allIdents=(List<Identity>)runContext.get("String_Node_Str");
              Boolean sendMailObj=(Boolean)runContext.get("String_Node_Str");
              boolean sendmail=sendMailObj == null ? true : sendMailObj.booleanValue();
              processGroupAdditionForAllIdents(allIdents,ownGroups,partGroups,sendmail);
            }
            report.setHasChanges(true);
          }
        }
 catch (        Exception any) {
          logError("String_Node_Str",any);
          report.addError("String_Node_Str");
        }
        return report.isHasChanges() ? StepsMainRunController.DONE_MODIFIED : StepsMainRunController.DONE_UNCHANGED;
      }
    }
;
    importStepsController=new StepsMainRunController(ureq,getWindowControl(),start,finish,null,translate("String_Node_Str"),"String_Node_Str");
    listenTo(importStepsController);
    getWindowControl().pushAsModalDialog(importStepsController.getInitialComponent());
  }
}

Fixed version (ground truth):
@Override protected void event(UserRequest ureq,Component source,Event event){
  if (source == startLink) {
    doOpenImportWizard(ureq);
  }
}