该应用程序是在gwt和hibernate上开发的。我更改了其中一个表（stasite），以在Oracle DB中再增加一个列，其大小为varchar（10）。我在实体类中添加了setters和getters。 但是，当我运行该应用程序时，出现以下错误-UnplannedEvent是主表之一。但是，当我在stasite实体类中注释新添加的变量时，应用程序可以正常工作。
**Below is the error -**
[ERROR] [WARNING] Failed to destroy resource: com.mchange.v2.c3p0.impl.NewPooledConnection@42362b92java.sql.SQLException: Some resources failed to close properly while closing com.mchange.v2.c3p0.impl.NewPooledConnection@42362b92
[ERROR] at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:571)
[ERROR] at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:234)
[ERROR] at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.destroyResource(C3P0PooledConnectionPool.java:470)
[ERROR] at com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask.run(BasicResourcePool.java:964)
[ERROR] at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
[ERROR]
[INFO] [02/11/18 08:45:17:243] INFO DefaultLoadEventListener:160 - Error performing load command
[INFO] org.hibernate.exception.JDBCConnectionException: could not load an entity: [com.shared.serviceevent.unplannedevent.entity.UnplannedEvent#10186148]
[INFO] at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:99)
[INFO] at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
[INFO] at org.hibernate.loader.Loader.loadEntity(Loader.java:1937)
[INFO] at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:86)
[INFO] at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:76)
[INFO] at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3270)
[INFO] at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:496)
[INFO] at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:477)
[INFO] at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:227)
[INFO] at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:285)
[INFO] at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:152)
[INFO] at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:1080)
[INFO] at org.hibernate.impl.SessionImpl.get(SessionImpl.java:997)
[INFO] at org.hibernate.impl.SessionImpl.get(SessionImpl.java:990)
[INFO] at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:610)
[INFO] at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:585)
[INFO] at com.hub.server.common.dao.JpaDao.fetch(JpaDao.java:50)
[INFO] at com.hub.server.serviceevent.service.ServiceEventService.getServiceEvent(ServiceEventService.java:163)
[INFO] at com.hub.server.serviceevent.service.ServiceEventService.getServiceEvent(ServiceEventService.java:156)
[INFO] at com.hub.server.serviceevent.service.ServiceEventService.save(ServiceEventService.java:208)
[INFO] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[INFO] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO] at java.lang.reflect.Method.invoke(Method.java:606)
[INFO] at net.sf.gilead.gwt.PersistentRemoteService.processCall(PersistentRemoteService.java:174)
[INFO] at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:373)
[INFO] at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
[INFO] at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
[INFO] at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
[INFO] at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
[INFO] at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
[INFO] at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
[INFO] at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
[INFO] at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
[INFO] at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
[INFO] at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
[INFO] at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
[INFO] at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
[INFO] at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
[INFO] at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
[INFO] at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:68)
[INFO] at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
[INFO] at org.eclipse.jetty.server.Server.handle(Server.java:370)
[INFO] at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
[INFO] at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
[INFO] at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
[INFO] at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
[INFO] at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
[INFO] at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
[INFO] at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
[INFO] at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
[INFO] at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
[INFO] at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
[INFO] at java.lang.Thread.run(Thread.java:745)
[INFO] Caused by: java.sql.SQLRecoverableException: No more data to read from socket
[INFO] at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1157)
[INFO] at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:350)
[INFO] at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
[INFO] at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
[INFO] at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:208)
[INFO] at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:886)
[INFO] at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1175)
[INFO] at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1296)
[INFO] at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3613)
[INFO] at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3657)
[INFO] at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1495)
[INFO] at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:76)
[INFO] at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208)
[INFO] at org.hibernate.loader.Loader.getResultSet(Loader.java:1849)
[INFO] at org.hibernate.loader.Loader.doQuery(Loader.java:718)
[INFO] at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270)
[INFO] at org.hibernate.loader.Loader.loadEntity(Loader.java:1933)
[INFO] ... 51 more
答案 0 :(得分：0)
您是否在添加的字段上添加了@Column？
如果没有，请添加并尝试。
另一个原因可能是因为您的列名与实体中变量的名称不匹配。因此请确保您还添加了列的名称。