Program: 98862
Project: 98862
Buggy source:
@Override public String execute() throws Exception {
  HttpServletRequest request=ServletActionContext.getRequest();
  String token=(String)request.getSession().getAttribute("String_Node_Str");
  if (token != null) {
    WebApplicationContext context=WebApplicationContextUtils.getRequiredWebApplicationContext(ServletActionContext.getServletContext());
    CampusConnection campusConnection=(CampusConnection)context.getBean("String_Node_Str");
    campusConnection.setCampusSession(token);
    bUOC.setCampusConnection(campusConnection);
  }
  UserInformation userInfo=bUOC.getUserInformation();
  if (userInfo != null) {
    listSubjects=bUOC.getUserSubjects();
    if (s_assign != null) {
      String[] infoAssing=s_assign.split("String_Node_Str");
      teacher=bUOC.isTeacher(new UOCSubject(infoAssing[0],infoAssing[2]));
      listClassroms=bUOC.getUserClassrooms(new UOCSubject(infoAssing[0],infoAssing[2]));
    }
    if (s_aula != null && s_aula.length() > 0 && s_assign != null) {
      String[] infoAssing=s_assign.split("String_Node_Str");
      listActivity=bUOC.getSubjectActivities(new UOCSubject(infoAssing[0],infoAssing[2]));
    }
    if (s_aula != null && s_aula.length() > 0 && s_assign != null && s_activ != null && s_activ.length() > 0) {
      Activity objActivity=new Activity();
      for (int j=0; j < listActivity.length; j++) {
        if (listActivity[j].getIndex() == Integer.parseInt(s_activ)) {
          objActivity=listActivity[j];
        }
      }
      String[] infoAssing=s_assign.split("String_Node_Str");
      if (teacher) {
        UOCClassroom objClassroom=null;
        for (int i=0; i < listClassroms.length; i++) {
          if (listClassroms[i].getIndex() == Integer.parseInt(s_aula)) {
            objClassroom=listClassroms[i];
          }
        }
        listDeliverDetails=bUOC.getLastClassroomDeliverDetails(objActivity,objClassroom);
        if (listDeliverDetails != null && listDeliverDetails.length > 0)         maxDelivers=String.valueOf(listDeliverDetails[0].getMaxDelivers());
      }
 else {
        listDeliverDetails=bUOC.getUserDeliverDetails(new UOCSubject(infoAssing[0],infoAssing[2]),objActivity.getIndex());
        if (listDeliverDetails.length > 0 && listDeliverDetails != null)         maxDelivers=String.valueOf(listDeliverDetails[0].getMaxDelivers());
      }
    }
    imageURL=userInfo.getUserPhoto();
    if (imageURL == null)     imageURL="String_Node_Str";
    fullName=userInfo.getUserFullName();
  }
 else {
    imageURL=null;
    fullName=null;
  }
  String toReturn=SUCCESS;
  if (TAB_PROGRAMMING_ENVIROMENT.equals(activeTab)) {
    toReturn=TAB_PROGRAMMING_ENVIROMENT;
  }
  return toReturn;
}

Fixed version (ground truth):
@Override public String execute() throws Exception {
  HttpServletRequest request=ServletActionContext.getRequest();
  String token=(String)request.getSession().getAttribute("String_Node_Str");
  if (token != null) {
    WebApplicationContext context=WebApplicationContextUtils.getRequiredWebApplicationContext(ServletActionContext.getServletContext());
    CampusConnection campusConnection=(CampusConnection)context.getBean("String_Node_Str");
    campusConnection.setCampusSession(token);
    bUOC.setCampusConnection(campusConnection);
  }
  UserInformation userInfo=bUOC.getUserInformation();
  if (userInfo != null) {
    listSubjects=bUOC.getUserSubjects();
    if (s_assign != null) {
      String[] infoAssing=s_assign.split("String_Node_Str");
      teacher=bUOC.isTeacher(new UOCSubject(infoAssing[0],infoAssing[2]));
      listClassroms=bUOC.getUserClassrooms(new UOCSubject(infoAssing[0],infoAssing[2]));
    }
    if (s_aula != null && s_aula.length() > 0 && s_assign != null) {
      String[] infoAssing=s_assign.split("String_Node_Str");
      listActivity=bUOC.getSubjectActivities(new UOCSubject(infoAssing[0],infoAssing[2]));
    }
    if (s_aula != null && s_aula.length() > 0 && s_assign != null && s_activ != null && s_activ.length() > 0) {
      Activity objActivity=new Activity();
      for (int j=0; j < listActivity.length; j++) {
        if (listActivity[j].getIndex() == Integer.parseInt(s_activ)) {
          objActivity=listActivity[j];
        }
      }
      String[] infoAssing=s_assign.split("String_Node_Str");
      if (teacher) {
        UOCClassroom objClassroom=null;
        for (int i=0; i < listClassroms.length; i++) {
          if (listClassroms[i].getIndex() == Integer.parseInt(s_aula)) {
            objClassroom=listClassroms[i];
          }
        }
        listDeliverDetails=bUOC.getLastClassroomDeliverDetails(objActivity,objClassroom);
        if (listDeliverDetails != null && listDeliverDetails.length > 0) {
          int cont=0;
          Boolean exit=false;
          while (!exit) {
            if (listDeliverDetails[cont] != null) {
              maxDelivers=String.valueOf(listDeliverDetails[cont].getMaxDelivers());
              exit=true;
            }
            cont++;
          }
        }
      }
 else {
        listDeliverDetails=bUOC.getUserDeliverDetails(new UOCSubject(infoAssing[0],infoAssing[2]),objActivity.getIndex());
        if (listDeliverDetails != null && listDeliverDetails.length > 0) {
          int cont=0;
          Boolean exit=false;
          while (!exit) {
            if (listDeliverDetails[cont] != null) {
              maxDelivers=String.valueOf(listDeliverDetails[cont].getMaxDelivers());
              exit=true;
            }
            cont++;
          }
        }
      }
    }
    imageURL=userInfo.getUserPhoto();
    if (imageURL == null)     imageURL="String_Node_Str";
    fullName=userInfo.getUserFullName();
  }
 else {
    imageURL=null;
    fullName=null;
  }
  String toReturn=SUCCESS;
  if (TAB_PROGRAMMING_ENVIROMENT.equals(activeTab)) {
    toReturn=TAB_PROGRAMMING_ENVIROMENT;
  }
  return toReturn;
}