对已经获取的对象

我刚刚更新从SND 2一个项目，SDN3在Spring环境，并通过类似迫使传统的简单索引和索引TypeRepresentationStrategy必要的修改去访问春数据Neo4j的trows NotInTransactionException。对已经获取的对象

语境开机就好了，但考虑到下面的代码...

@RequestMapping({"/customer/browse"}) 
public String customerBrowse(final ModelMap model) { 
    populateBaseModel(model); 
    Result<Customer> result = this.customerService.findAll(); 
    for(Customer c : result) { 
     LOG.info("Customer: {}", c.getName()); 
    } 
    model.addAttribute("allCustomer", result); 
    return "pages/browse"; 
}

...的的findAll（）调用库运行完美，同时检索到的客户仅仅访问对象for(Customer c : result)触发NotInTransactionException（见下面）。 Customer类有几个传统索引注释但没有传出引用。对我来说，不清楚为什么简单访问成功检索的对象会遇到NotInTransactionException异常。我在简单模式下运行SDN，并假定这个foreach正在分离的Customer对象上运行。异常之前

org.neo4j.graphdb.NotInTransactionException 
at org.neo4j.index.impl.lucene.LuceneIndex.assertInTransaction(LuceneIndex.java:631) 
at org.neo4j.index.impl.lucene.LuceneIndex.access$000(LuceneIndex.java:58) 
at org.neo4j.index.impl.lucene.LuceneIndex$1.hasNext(LuceneIndex.java:359) 
at org.neo4j.helpers.collection.IteratorWrapper.hasNext(IteratorWrapper.java:42) 
at org.neo4j.helpers.collection.IteratorWrapper.hasNext(IteratorWrapper.java:42) 
at com.myapp.controller.CustomerController.customerBrowse(CustomerController.java:56) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:606) 
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215) 
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) 
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781) 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721) 
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) 
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.doGet(FrameworkServlet.java:857) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:735) 
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) 
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:669) 
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1448) 
at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:160) 
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) 
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) 
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344) 
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261) 
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419) 
at com.github.dandelion.datatables.core.web.filter.DatatablesFilter.doFilter(DatatablesFilter.java:75) 
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419) 
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419) 
at com.github.dandelion.core.web.DandelionFilter.doFilter(DandelionFilter.java:138) 
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419) 
at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:198) 
at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:176) 
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419) 
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455) 
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) 
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557) 
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) 
at org.eclipse.jetty.server.handler.ContextHandler.__doHandle(ContextHandler.java:1075) 
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java) 
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384) 
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) 
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009) 
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) 
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255) 
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154) 
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) 
at org.eclipse.jetty.server.Server.handle(Server.java:368) 
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:488) 
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:932) 
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:994) 
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:640) 
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) 
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) 
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628) 
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52) 
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) 
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) 
at java.lang.Thread.run(Thread.java:744)

跟踪输出：

| org.springframework.web.method.HandlerMethod   | Invoking [CustomerController.customerBrowse] method with arguments [{}] 
| o.s.d.r.c.s.TransactionalRepositoryProxyPostProcessor$CustomAnnotationTransactionAttributeSource | Adding transactional method 'findAll' with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly; '' 
| o.s.beans.factory.support.DefaultListableBeanFactory | Returning cached instance of singleton bean 'neo4jTransactionManager' 
| o.springframework.transaction.jta.JtaTransactionManager | Creating new transaction with name [org.springframework.data.neo4j.repository.NodeGraphRepositoryImpl.findAll]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly; '' 
| o.s.t.support.TransactionSynchronizationManager   | Initializing transaction synchronization 
| o.s.transaction.interceptor.TransactionInterceptor  | Getting transaction for [org.springframework.data.neo4j.repository.NodeGraphRepositoryImpl.findAll] 
| o.s.transaction.interceptor.TransactionInterceptor  | Completing transaction for [org.springframework.data.neo4j.repository.NodeGraphRepositoryImpl.findAll] 
| o.springframework.transaction.jta.JtaTransactionManager | Triggering beforeCommit synchronization 
| o.springframework.transaction.jta.JtaTransactionManager | Triggering beforeCompletion synchronization 
| o.springframework.transaction.jta.JtaTransactionManager | Initiating transaction commit 
| o.springframework.transaction.jta.JtaTransactionManager | Triggering afterCommit synchronization 
| o.springframework.transaction.jta.JtaTransactionManager | Triggering afterCompletion synchronization 
| o.s.t.support.TransactionSynchronizationManager   | Clearing transaction synchronization

本次交易范围由下面的服务层处理：

@Service 
    @Transactional 
    public class CustomerService implements AssetService, ApplicationContextAware { 

     @Autowired 
     private CustomerRepository customerRepository; 

      ... 

      public Result<Customer> findAll() { 
      return this.customerRepository.findAll(); 
      } 

      ... 
    }

的SDN关于自动交易手动会谈照顾一些其方法。正如从日志中看来的，这对findAll（）调用很好，但是这仍然对检索对象访问失败的原因保持开放。

真的很感激，如果任何人都可以点我排除故障朝着正确的方向。

来源

2014-12-03 theeagermichael

我没有给你答案，但这篇文章可能是相关阅读。这是一个奇怪的问题;之前出现了类似的情况，而且没有确定的解决方案。诀窍是找到一个可以真正重复的案例，我认为。 https://groups.google.com/d/topic/neo4j/w1L_21z0z04/discussion – FrobberOfBits 2014-12-03 18:37:20

好像你不能工作了SDN的非事务性范围提供结果或迭代器。如果我让查询返回集合/列表等，那么事情在非事务范围内工作。也许我错过了这个文档。然而，这使得默认的findAll（）无用的，如果你只是想通过自己的结果到视图模板层（因为这是出于交易范围是肯定的）。您需要始终确保您只使用SDN结果类型直到服务层... – theeagermichael 2014-12-03 23:55:13

声明：不知道详细级别的SDN。 Neo4j 1.9 - > 2.x的其中一项变化是需要强制读取事务。不是100％确定'findAll'在底层做了什么，但我认为迭代读取了一些东西，因此需要一个你的控制器似乎没有的事务上下文。岂不是有意义的迭代重构为返回一个列表''事务服务的方法？ – 2014-12-04 16:13:56

我在结果进行遍历时，得到了同样的确切异常，在这里和那里读一些意见后，我整理出来这样说：

@Repository 
public class OrderDAO implements DaoOperations<Order> { 

@Autowired 
private Neo4jOperations neo4j; 
@Autowired 
private GraphDatabase gd; 

public List<Order> findAll() { 

    List<Order> list = new ArrayList<Order>(); 

    try (Transaction tx = gd.beginTx()) { 
     Result<Order>res = neo4j.findAll(Order.class); 
     list =IteratorUtil.asList(res); 
    } 

    return list; 
    } 
}

注意方法neo4j.findAll（）最初返回因此，我转换到这个列表交易范围内，并且解决了这个问题，现在我可以遍历列表中没有我的服务/控制器抛出任何异常。希望这可以帮助。

来源

2015-04-19 19:39:58

对已经获取的对象

回答

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