對已經獲取的對象

我剛剛更新從SND 2一個項目，SDN3在Spring環境，並通過類似迫使傳統的簡單索引和索引TypeRepresentationStrategy必要的修改去訪問春數據Neo4j的trows NotInTransactionException。對已經獲取的對象

語境開機就好了，但考慮到下面的代碼...

@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（）調用庫運行完美，同時檢索到的客戶僅僅訪問對象for(Customer c : result)觸發NotInTransactionException（見下面）。 Customer類有幾個傳統索引註釋但沒有傳出引用。對我來說，不清楚爲什麼簡單訪問成功檢索的對象會遇到NotInTransactionException異常。我在簡單模式下運行SDN，並假定這個foreach正在分離的Customer對象上運行。異常之前

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)

跟蹤輸出：

| 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

本次交易範圍由下面的服務層處理：

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

     @Autowired 
     private CustomerRepository customerRepository; 

      ... 

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

      ... 
    }

的SDN關於自動交易手動會談照顧一些其方法。正如從日誌中看來的，這對findAll（）調用很好，但是這仍然對檢索對象訪問失敗的原因保持開放。

真的很感激，如果任何人都可以點我排除故障朝着正確的方向。

來源

2014-12-03 theeagermichael

我沒有給你答案，但這篇文章可能是相關閱讀。這是一個奇怪的問題;之前出現了類似的情況，而且沒有確定的解決方案。訣竅是找到一個可以真正重複的案例，我認爲。 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的非事務性範圍提供結果或迭代器。如果我讓查詢返回集合/列表等，那麼事情在非事務範圍內工作。也許我錯過了這個文檔。然而，這使得默認的findAll（）無用的，如果你只是想通過自己的結果到視圖模板層（因爲這是出於交易範圍是肯定的）。您需要始終確保您只使用SDN結果類型直到服務層... – theeagermichael 2014-12-03 23:55:13

聲明：不知道詳細級別的SDN。 Neo4j 1.9 - > 2.x的其中一項變化是需要強制讀取事務。不是100％確定'findAll'在底層做了什麼，但我認爲迭代讀取了一些東西，因此需要一個你的控制器似乎沒有的事務上下文。豈不是有意義的迭代重構爲返回一個列表''事務服務的方法？ – 2014-12-04 16:13:56

我在結果進行遍歷時，得到了同樣的確切異常，在這裏和那裏讀一些意見後，我整理出來這樣說：

@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，我轉換到這個列表交易範圍內，並且解決了這個問題，現在我可以遍歷列表中沒有我的服務/控制器拋出任何異常。希望這可以幫助。

來源

2015-04-19 19:39:58

對已經獲取的對象

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