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저는 GWT를 초보자로 삼아 프로젝트에서 Spring 프레임 워크와 GWT를 통합합니다. 모듈 페이지에는 LeftSide (트리 뷰)와 RightPanel (그리드 뷰)의 두 부분이 있습니다. 데이터베이스 (Department, Employee)에서 treeview 노드를 빌드합니다. Gridview는 treeview에서 노드를 선택할 때 결과를 표시하는 데 사용됩니다. 문제는 내가 URL (http://127.0.0.1:8888/ams.html?gwt.codesvr=127.0.0.1:9997), 가끔 열어, treeview 쇼 아무것도, 콘솔에 다음과 같은 예외가 인쇄됩니다. 하지만 오른쪽 gridview는 괜찮습니다. 나는 EntityLocator의의 isLive를 오버라이드 (override)하는 경우 다음 방법 (그냥 사실을 반환)이 항상 OKGWT에서 EntityLocator의 isLive를 재정의하는 방법
javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: could not load an entity: [com.sparj.ams.server.domain.staff.Department#50001]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1214)
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:635)
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:589)
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:601)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:365)
at $Proxy31.find(Unknown Source)
at com.sparj.ams.server.locator.EntityLocator.find(EntityLocator.java:47)
at com.sparj.ams.server.locator.EntityLocator.find(EntityLocator.java:1)
at com.google.web.bindery.requestfactory.shared.Locator.isLive(Locator.java:96)
at com.google.web.bindery.requestfactory.server.LocatorServiceLayer.doIsLive(LocatorServiceLayer.java:188)
at com.google.web.bindery.requestfactory.server.LocatorServiceLayer.isLive(LocatorServiceLayer.java:85)
at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.isLive(ServiceLayerDecorator.java:116)
at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.isLive(ServiceLayerDecorator.java:116)
at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.createReturnOperations(SimpleRequestProcessor.java:282)
at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:240)
at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:135)
at com.google.web.bindery.requestfactory.server.RequestFactoryServlet.doPost(RequestFactoryServlet.java:133)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1097)
at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:147)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: org.hibernate.exception.JDBCConnectionException: could not load an entity: [com.sparj.ams.server.domain.staff.Department#50001]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:99)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.loader.Loader.loadEntity(Loader.java:2041)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:86)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:76)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3268)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:496)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:477)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:227)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:285)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:152)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:1090)
at org.hibernate.impl.SessionImpl.get(SessionImpl.java:1005)
at org.hibernate.impl.SessionImpl.get(SessionImpl.java:998)
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:614)
... 41 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after statement closed.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1014)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
at com.mysql.jdbc.StatementImpl.checkClosed(StatementImpl.java:463)
at com.mysql.jdbc.PreparedStatement.setInternal(PreparedStatement.java:3783)
at com.mysql.jdbc.PreparedStatement.setInternal(PreparedStatement.java:3832)
at com.mysql.jdbc.PreparedStatement.setLong(PreparedStatement.java:3849)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.setLong(NewProxyPreparedStatement.java:703)
at org.hibernate.type.descriptor.sql.BigIntTypeDescriptor$1.doBind(BigIntTypeDescriptor.java:52)
at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:89)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:282)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:277)
at org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:1873)
at org.hibernate.loader.Loader.bindParameterValues(Loader.java:1844)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1716)
at org.hibernate.loader.Loader.doQuery(Loader.java:801)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
at org.hibernate.loader.Loader.loadEntity(Loader.java:2037)
... 53 more
안녕하세요, Thomas, 도와 주셔서 감사합니다. 나는 지금 OpenSessionInView를 조사 할 것이다. :) –
+1 "open-session-in-view"에 대한 별명 인 "session-per-http-request" (JSP와는 대조적으로) 클라이언트 인 경우, 세션 (작업 단위)은 클라이언트 측보기로 확장되지 않습니다. –
@ChrisLercher 당신 말이 맞습니다. 편집 된 답변을 제출하고 지금부터 해당 용어를 사용하려고합니다. –