针对GoogleAppEngine-org.datanucleus.exceptions.NucleusUserException：对象管理器已关闭这个问题，本篇文章进行了详细的解答，同时本文还将给你
针对Google App Engine-org.datanucleus.exceptions.NucleusUserException：对象管理器已关闭这个问题，本篇文章进行了详细的解答，同时本文还将给你拓展Android json错误com.google.gson.JsonSyntaxException：java.lang.IllegalStateException、AppEngine ClassNotFoundException：com.google.appengine.api.datastore.DatastoreServiceFactory、Caused by: java.lang.ClassNotFoundException: com.google.protobuf.ServiceException、Caused by: org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper serve...等相关知识，希望可以帮助到你。
本文目录一览：- Google App Engine-org.datanucleus.exceptions.NucleusUserException：对象管理器已关闭
- Android json错误com.google.gson.JsonSyntaxException：java.lang.IllegalStateException
- AppEngine ClassNotFoundException：com.google.appengine.api.datastore.DatastoreServiceFactory
- Caused by: java.lang.ClassNotFoundException: com.google.protobuf.ServiceException
- Caused by: org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper serve...
Google App Engine-org.datanucleus.exceptions.NucleusUserException：对象管理器已关闭
为什么下面的代码导致org.datanucleus.exceptions.NucleusUserException：对象管理器已关闭？似乎在query.getResultList（）处引发了异常。
public final void removeUserTokens(final String username) { final Query query = entityManager.createQuery( "SELECT p FROM PersistentLogin p WHERE username = :username"); query.setParameter("username", username); for (Object token : query.getResultList()) { entityManager.remove(token); }}例外：
org.datanucleus.exceptions.NucleusUserException: Object Manager has been closed at org.datanucleus.ObjectManagerImpl.assertIsOpen(ObjectManagerImpl.java:3876) at org.datanucleus.ObjectManagerImpl.getFetchPlan(ObjectManagerImpl.java:376) at org.datanucleus.store.query.Query.getFetchPlan(Query.java:497) at org.datanucleus.store.appengine.query.DatastoreQuery$6.apply(DatastoreQuery.java:611) at org.datanucleus.store.appengine.query.DatastoreQuery$6.apply(DatastoreQuery.java:610) at org.datanucleus.store.appengine.query.LazyResult.resolveNext(LazyResult.java:94) at org.datanucleus.store.appengine.query.LazyResult$LazyAbstractListIterator.computeNext(LazyResult.java:215) at org.datanucleus.store.appengine.query.AbstractIterator.tryToComputeNext(AbstractIterator.java:132) at org.datanucleus.store.appengine.query.AbstractIterator.hasNext(AbstractIterator.java:127) at org.datanucleus.store.appengine.query.LazyResult$AbstractListIterator.hasNext(LazyResult.java:169) at com.mystuff.service.auth.PersistentTokenRepositoryImpl.removeUserTokens(PersistentTokenRepositoryImpl.java:90)编辑 ：我增加了数据核的日志级别，这就是我所看到的。
FINE: Object Manager "org.datanucleus.ObjectManagerImpl@5d8d3d6c" opened for datastore "org.datanucleus.store.appengine.DatastoreManager@2447e380"Feb 25, 2010 7:21:38 AM org.datanucleus.ObjectManagerImpl initialiseLevel1CacheFINE: Level 1 Cache of type "weak" initialisedFeb 25, 2010 7:21:38 AM org.datanucleus.JDOClassLoaderResolver classForNameFINE: Class "java.lang.PersistentLogin" was not found in the CLASSPATH [Class resolver called from org.datanucleus.util.Imports.resolveClassDeclaration (line=177)]Feb 25, 2010 7:21:38 AM org.datanucleus.ObjectManagerImpl disconnectSMCacheFINE: Level 1 Cache clearedFeb 25, 2010 7:21:38 AM org.datanucleus.ObjectManagerImpl postCloseFINE: Object Manager "org.datanucleus.ObjectManagerImpl@5d8d3d6c" closedFeb 25, 2010 7:21:38 AM com.google.apphosting.utils.jetty.JettyLogger warnWARNING: /j_spring_security_logoutObject Manager has been closedorg.datanucleus.exceptions.NucleusUserException: Object Manager has been closed at org.datanucleus.ObjectManagerImpl.assertIsOpen(ObjectManagerImpl.java:3876) at org.datanucleus.ObjectManagerImpl.getFetchPlan(ObjectManagerImpl.java:376)答案1
小编典典添加@Transactional到该方法可以防止对象管理器关闭。但是，我不确定为什么没有它就关闭。
Android json错误com.google.gson.JsonSyntaxException：java.lang.IllegalStateException
我在解析json数据时遇到此错误
Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2
我无法找到解决方案.我的json数据是：
{
"user": [
{
"email": "wijden@jerseyrest.com",
"firstName": "Wijden",
"id": "1",
"lastName": "User"
}, {
"email": "user@jerseyrest.com",
"firstName": "Sample",
"id": "2",
"lastName": "User"
}, {
"email": "ingenieur@jerseyrest.com",
"firstName": "Ingenieur",
"id": "3",
"lastName": "User"
}
]
}
这就是我做到的方式：
Type type = new Typetoken<List<WorkItem>>() { }.getType();
List<WorkItem> workitems = (List<WorkItem>) new Gson().fromJson(resultat, type);
如果你能帮助我解决问题,我将不胜感激.提前致谢
解决方法:
为了解析你的JSON,我创建了包装响应的类,即：
public class Response {
@Serializedname("user")
private List<User> userList;
//getters and setters
}
和,
public class User{
@Serializedname("id")
private int id;
@Serializedname("email")
private String email;
@Serializedname("firstName")
private String firstName;
@Serializedname("lastName")
private String lastName;
//getters and setters
}
然后,为了解析您的JSON响应,您只需要：
Gson gson = new Gson();
Response data = gson.fromJson(yourjsonString, Response.class);
然后,您可以非常轻松地访问您的数据,例如：
User user = data.getUserList.get(i);
注意：使用注释@Serializedname对于分离JSON响应中和应用程序中的字段名称很有意义,以便遵循Java命名约定…
AppEngine ClassNotFoundException：com.google.appengine.api.datastore.DatastoreServiceFactory
当我尝试在AppEngine中使用低级DataStore
API时，我得到了一个有趣的东西ClassNotFoundException。此异常发生在云服务器中，而不是在本地实例中。我在本地使用appengine-
java-sdk-1.7.4。
java.lang.NoClassDefFoundError: com/google/appengine/api/datastore/DatastoreServiceFactory
at org.himadri.scradiolisteners.server.FetchingServlet.writeDataLowLevel(FetchingServlet.java:47)
at org.himadri.scradiolisteners.server.FetchingServlet.doGet(FetchingServlet.java:39)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:447)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:703)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:338)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:330)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.ClassNotFoundException: com.google.appengine.api.datastore.DatastoreServiceFactory
at com.google.appengine.runtime.Request.process-e485d13152ebc944(Request.java)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at org.himadri.scradiolisteners.server.FetchingServlet.writeDataLowLevel(FetchingServlet.java:47)
at org.himadri.scradiolisteners.server.FetchingServlet.doGet(FetchingServlet.java:39)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:703)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:338)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:330)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458)
... 1 more
Caused by: java.lang.ClassNotFoundException: com.google.protobuf.ServiceException
@杨桃兄弟 你好，想跟你请教个问题：
<dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-client</artifactId> <version>2.7.2</version> <!-- <version>2.2.0</version>--> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-common</artifactId> <version>2.7.2</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-hdfs</artifactId> <version>2.7.2</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-mapreduce-client-core</artifactId> <version>2.7.2</version> </dependency>
我pom 文件里的，一直报这个错
Caused by: org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper serve...
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ''brandController'' defined in file [G:\idjavacode\pygqingmu2parent\pyg_qingmu2_web_manager\target\pyg_qingmu2_web_manager-1.0-SNAPSHOT\WEB-INF\classes\com\qingmu2\core\controller\BrandController.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanInitializationException: Failed to init remote service reference at filed brandService in class com.qingmu2.core.controller.BrandController; nested exception is org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper server within timeout: 5000
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682)
at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553)
at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494)
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1144)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1091)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:773)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:133)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:800)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1471)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.factory.BeanInitializationException: Failed to init remote service reference at filed brandService in class com.qingmu2.core.controller.BrandController; nested exception is org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper server within timeout: 5000
at com.alibaba.dubbo.config.spring.AnnotationBean.postProcessBeforeInitialization(AnnotationBean.java:253)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
... 35 more
Caused by: org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper server within timeout: 5000
at org.I0Itec.zkclient.ZkClient.connect(ZkClient.java:876)
at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:98)
at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:92)
at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:80)
at com.alibaba.dubbo.remoting.zookeeper.zkclient.ZkclientZookeeperClient.<init>(ZkclientZookeeperClient.java:26)
at com.alibaba.dubbo.remoting.zookeeper.zkclient.ZkclientZookeeperTransporter.connect(ZkclientZookeeperTransporter.java:10)
at com.alibaba.dubbo.remoting.zookeeper.ZookeeperTransporter$Adpative.connect(ZookeeperTransporter$Adpative.java)
at com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry.<init>(ZookeeperRegistry.java:69)
at com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistryFactory.createRegistry(ZookeeperRegistryFactory.java:37)
at com.alibaba.dubbo.registry.support.AbstractRegistryFactory.getRegistry(AbstractRegistryFactory.java:94)
at com.alibaba.dubbo.registry.RegistryFactory$Adpative.getRegistry(RegistryFactory$Adpative.java)
at com.alibaba.dubbo.registry.integration.RegistryProtocol.refer(RegistryProtocol.java:240)
at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper.refer(ProtocolFilterWrapper.java:60)
at com.alibaba.dubbo.rpc.protocol.ProtocolListenerWrapper.refer(ProtocolListenerWrapper.java:63)
at com.alibaba.dubbo.rpc.Protocol$Adpative.refer(Protocol$Adpative.java)
at com.alibaba.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:392)
at com.alibaba.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:300)
at com.alibaba.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:138)
at com.alibaba.dubbo.config.spring.AnnotationBean.refer(AnnotationBean.java:317)
at com.alibaba.dubbo.config.spring.AnnotationBean.postProcessBeforeInitialization(AnnotationBean.java:246)
... 38 more这里没有打开zookeeper注册中心导致的这个错误
关于Google App Engine-org.datanucleus.exceptions.NucleusUserException：对象管理器已关闭的介绍已经告一段落，感谢您的耐心阅读，如果想了解更多关于Android json错误com.google.gson.JsonSyntaxException：java.lang.IllegalStateException、AppEngine ClassNotFoundException：com.google.appengine.api.datastore.DatastoreServiceFactory、Caused by: java.lang.ClassNotFoundException: com.google.protobuf.ServiceException、Caused by: org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper serve...的相关信息，请在本站寻找。
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