I use lookup to get value from Neo4jDB,but it return null

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First i set data to the Neo4jDB,Then i want get the value,but it return null.I have no idea about it.I think i had set the data successgully,what is wrong?I can get username and password from browser,then i use lookup,and nothing i can get

@Transactional
public void populateWithSomeTestData() {
    System.out.println("==== Populating ====");

    GraphDatabaseService graphDb = template.getGraphDatabaseService();

    Transaction tx = graphDb.beginTx();

    try {

        User user = new User("micha", "Micha", "password",
                User.Roles.ROLE_USER);
        User me = template.save(user);
        User yang = template.save(new User("yang", "Yang", "password",
                User.Roles.ROLE_USER));
        User ollie = template.save(new User("ollie", "Olliver", "password",
                User.Roles.ROLE_USER));
        me.addFriend(ollie);

        // id and title
        Movie forrestGump = template.save(new Movie("1", "Forrest Gump"));

        me.rate(template, forrestGump, 5, "Best of the series");

        tx.success();
        String name = me.getName();
        log.debug(name);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        tx.close();
        System.out.println("==== endPopulating ====");
    }

}
public boolean loginCheck(String userName, String password) {
    boolean rtn = false;
    GraphDatabaseService graphDb = template.getGraphDatabaseService();
    Transaction tx = graphDb.beginTx();

    try {

        User loginUser = template.lookup(User.class, "name", userName)
                .to(User.class).singleOrNull();

        System.out.println(loginUser);
        String userPassword = loginUser.getPassword();
        System.out.println(userPassword);
        if (new Md5PasswordEncoder().encodePassword(password, User.SALT)
                .equals(userPassword)) {

            rtn = true;

        }
        tx.success();
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } finally {
        tx.close();
    }

    return rtn;

}

error info

java.lang.NullPointerException at com.oberon.fm.neo4j.service.DatabasePopulator.loginCheck(DatabasePopulator.java:86) at com.oberon.fm.neo4j.service.DatabasePopulator$$FastClassBySpringCGLIB$$c9138765.invoke() at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:649) at com.oberon.fm.neo4j.service.DatabasePopulator$$EnhancerBySpringCGLIB$$aa214826.loginCheck() at com.oberon.fm.controller.AuthController.loginCheck(AuthController.java:43) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:177) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868) at javax.servlet.http.HttpServlet.service(HttpServlet.java:644) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745)

asked 1 min ago

yang

1

I use lookup to get value from Neo4jDB,but it return null