NullPointerException в Spring MVC

Question

У меня есть простое приложение MVC Spring.Я получаю следующее сообщение об ошибке из моего метода контроллера Spring, когда он пытается передать управление JSP.

Вот соответствующая часть моего контроллера.

@Controller
public class ReportsController {

@Autowired
private RecordsService recordsService;

@GetMapping("/reportEmployee")
public String listRecord(Model model) {
    model.addAttribute("listRecord", recordsService.reportbyEmployee());
    return "report/reportEmployee";
}

}

@Service
public class RecordsServiceImpl implements RecordsService {

@Autowired
private RecordsDAO recordsDAO;

public List<Object[]> reportbyEmployee() {
    // TODO Auto-generated method stub
    return recordsDAO.reportbyEmployee();
}

}

@Repository
public class RecordsDAOImpl implements RecordsDAO {

@Autowired
private SessionFactory sessionFactory;

@SuppressWarnings("unchecked")
@Transactional(rollbackFor = Exception.class)
public List<Object[]> reportbyEmployee() {
    Session session = this.sessionFactory.getCurrentSession();
    String hql="SELECT Records.employee.employee_id, SUM(case when Records.type=1 then 1 else 0 end),SUM(case when Records.type=0 then 1 else 0 end)" + 
            " FROM Records GROUP BY Records.employee.employee_id";
    List<Object[]> list = session.createQuery(hql).list();
    return list;
}

}

stack

SEVERE: Servlet.service() for servlet [springDispatcherServlet] in context with path [/Assignment] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
    at java.lang.String$CaseInsensitiveComparator.compare(Unknown Source)
    at java.lang.String$CaseInsensitiveComparator.compare(Unknown Source)
    at java.util.TreeMap.getEntryUsingComparator(Unknown Source)
    at java.util.TreeMap.getEntry(Unknown Source)
    at java.util.TreeMap.get(Unknown Source)
    at org.hibernate.dialect.function.SQLFunctionRegistry.findSQLFunction(SQLFunctionRegistry.java:45)
    at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.findSQLFunction(SessionFactoryHelper.java:385)
    at org.hibernate.hql.internal.ast.tree.IdentNode.getDataType(IdentNode.java:366)
    at org.hibernate.hql.internal.ast.HqlSqlWalker.lookupProperty(HqlSqlWalker.java:659)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.propertyRef(HqlSqlBaseWalker.java:1142)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.propertyRefLhs(HqlSqlBaseWalker.java:5794)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.propertyRef(HqlSqlBaseWalker.java:1128)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectExpr(HqlSqlBaseWalker.java:2291)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectExprList(HqlSqlBaseWalker.java:2232)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectClause(HqlSqlBaseWalker.java:1503)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:585)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:313)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:261)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:271)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:191)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:143)
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:119)
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
    at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:153)

Может кто-нибудь пролить свет на это?Это проблема из-за @ Autowrite?