使用JPA讀取varchar字段db2時出錯

Question

每次嘗試使用存儲在Db2表中的信息填充Java類的屬性時，都會遇到錯誤。 僅字符串屬性引起問題。

我使用JPA（EclipseLink）出現問題的字段為“ name1”，並在我的類中聲明為String變量。

該錯誤僅在此實體上發生，從其他實體獲取信息不會引發異常。

這是我的書架：

sun.io.MalformedInputException
at sun.io.ByteToCharUTF8.convert(Unknown Source)
at com.ibm.db2.jcc.b.v.a(v.java:16)
at com.ibm.db2.jcc.b.gc.a(gc.java:1803)
at com.ibm.db2.jcc.b.gc.n(gc.java:503)
at com.ibm.db2.jcc.b.gc.P(gc.java:1723)
at com.ibm.db2.jcc.b.ul.e(ul.java:1270)
at com.ibm.db2.jcc.b.ul.getObject(ul.java:1252)
at org.eclipse.persistence.internal.databaseaccess.DatabasePlatform.getObjectFromResultSet(DatabasePlatform.java:1344)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.getObject(DatabaseAccessor.java:1300)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.fetchRow(DatabaseAccessor.java:1075)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.processResultSet(DatabaseAccessor.java:768)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:655)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:558)
at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:1991)
at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:570)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:242)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:228)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:299)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:694)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2738)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows(ExpressionQueryMechanism.java:2691)
at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:495)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1168)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:899)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1127)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:403)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1215)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2896)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1793)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1775)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1740)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:258)
at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:469)
at de.basler.archivierung.db2.dao.fi.Kreditoren_SaldenListeDAO.findView(Kreditoren_SaldenListeDAO.java:39)
at de.basler.archivierung.service.view.fi.Service_Kreditoren_SaldenListe.findViewInhalt(Service_Kreditoren_SaldenListe.java:19)
at de.basler.archivierung.web.controller.fi.ControllerFIKreditoren.search(ControllerFIKreditoren.java:21)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.el.parser.AstValue.invoke(AstValue.java:278)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
at org.apache.myfaces.view.facelets.el.ContextAwareTagMethodExpression.invoke(ContextAwareTagMethodExpression.java:96)
at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
at javax.faces.component.UICommand.broadcast(UICommand.java:120)
at javax.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:1172)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:365)
at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1656)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:862)
at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:42)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:196)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:143)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Answer 1

數據庫中的類型是Varchar。 直接使用JBDC，我也會得到一個異常，即使用同一驅動程序連接到其他數據庫，並且從未遇到過問題。 驅動程序是否可能與數據庫的編碼有關？

直接使用JDBC時的stacktrace：

com.ibm.db2.jcc.b.SqlException: [jcc][t4][1065][12306][3.53.70] Bedingung java.io.CharConversionException abgefangen. Details finden Sie im angehängten Element der Throwable-Klasse. ERRORCODE=-4220, SQLSTATE=null
at com.ibm.db2.jcc.b.bd.a(bd.java:660)
at com.ibm.db2.jcc.b.bd.a(bd.java:60)
at com.ibm.db2.jcc.b.bd.a(bd.java:112)
at com.ibm.db2.jcc.b.gc.a(gc.java:1807)
at com.ibm.db2.jcc.b.gc.n(gc.java:503)
at com.ibm.db2.jcc.b.gc.D(gc.java:1143)
at com.ibm.db2.jcc.b.ul.getDouble(ul.java:806)
at de.basler.archivierung.Main.main(Main.java:25)
Caused by: java.nio.charset.MalformedInputException: Input length = 34
at com.ibm.db2.jcc.b.v.a(v.java:19)
at com.ibm.db2.jcc.b.gc.a(gc.java:1803)
... 4 more
Caused by: sun.io.MalformedInputException
at sun.io.ByteToCharUTF8.convert(Unknown Source)
at com.ibm.db2.jcc.b.v.a(v.java:16)
... 5 more

“這應該添加到問題中，而不是添加為答案。”

抱歉

我已經隔離了這引起問題的領域。 該列包含公司名稱。 例如“杜塞爾多夫”。 一些字符串可能具有捷克字符。 DB編碼1401頁。

謝謝您的幫助。

Answer 2

我用這個解決了類似的問題

@Column(name = "evt_description", length=2000)
String description;

就我而言，問題在於說明的大小大於255