在GAE / J＆amp; amp;上使用@MappedSuperclass时，“字段jdoFieldFlags是冲突的” JPA

时间：2014-09-18 05:20:29

标签： java google-app-engine jpa datanucleus mappedsuperclass

在查询GAE / J上的mappedsuperclass扩展的实体时出错。

MappedSuperClass 

import java.sql.Timestamp;
import javax.persistence.MappedSuperclass;

@MappedSuperclass
public abstract class AbstractModel {

    private String lastModifiedBy;
    private Timestamp createTimestamp;
    private Timestamp modifyTimestamp;
    private Integer version;

    // setters & getters
}

实体 

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "EMPLOYEE")
public class EmployeeModel extends AbstractModel {
    @Id
    private Integer id;
    private String address;
    private String name;
    private String position;

    // setters & getters
}

JPA查询如下所示。

Query q = em.createNativeQuery("SELECT * FROM EMPLOYEE", EmployeeModel.class);
@SuppressWarnings("unchecked")
List<EmployeeModel> list = q.getResultList();

我收到了错误

javax.persistence.PersistenceException: Result Class query field names are not case sensitive. It does not allow fields with same name, but in a different case. For instance, the field "jdoFieldFlags" is conflicting.
    at org.datanucleus.api.jpa.NucleusJPAHelper.getJPAExceptionForNucleusException(NucleusJPAHelper.java:302)
    at org.datanucleus.api.jpa.JPAQuery.getResultList(JPAQuery.java:202)
    at test20140919.EmployeeDao.list(EmployeeDao.java:21)
    at test20140919.EmployeeLogic.list(EmployeeLogic.java:34)
    at test20140919.EmployeeAction.list(EmployeeAction.java:45)
    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 com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:115)
    at com.google.api.server.spi.SystemService.invokeServiceMethod(SystemService.java:359)
    at com.google.api.server.spi.SystemServiceServlet.execute(SystemServiceServlet.java:160)
    at com.google.api.server.spi.SystemServiceServlet.doPost(SystemServiceServlet.java:118)
    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:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:127)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
    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 com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
    at org.mortbay.jetty.servlet.ServletHandler$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.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:98)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:491)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: org.datanucleus.exceptions.NucleusUserException: Result Class query field names are not case sensitive. It does not allow fields with same name, but in a different case. For instance, the field "jdoFieldFlags" is conflicting.
    at org.datanucleus.store.rdbms.query.ResultClassROF.populateDeclaredFieldsForUserType(ResultClassROF.java:508)
    at org.datanucleus.store.rdbms.query.ResultClassROF.populateDeclaredFieldsForUserType(ResultClassROF.java:514)
    at org.datanucleus.store.rdbms.query.ResultClassROF.access$100(ResultClassROF.java:65)
    at org.datanucleus.store.rdbms.query.ResultClassROF$1.run(ResultClassROF.java:228)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.datanucleus.store.rdbms.query.ResultClassROF.<init>(ResultClassROF.java:224)
    at org.datanucleus.store.rdbms.query.RDBMSQueryUtils.getResultObjectFactoryForNoCandidateClass(RDBMSQueryUtils.java:532)
    at org.datanucleus.store.rdbms.query.SQLQuery.performExecute(SQLQuery.java:295)
    at org.datanucleus.store.query.Query.executeQuery(Query.java:1789)
    at org.datanucleus.store.query.AbstractSQLQuery.executeWithMap(AbstractSQLQuery.java:345)
    at org.datanucleus.api.jpa.JPAQuery.getResultList(JPAQuery.java:185)
    ... 48 more

消息说＆＃34;字段jdoFieldFlags是冲突的。＆＃34;，但是任何字段都没有重复，我也没有定义jdoFieldFlags字段。

为什么会出现这种错误？请告诉我如何解决这个错误。

定义EmployeeModel中的所有字段而不扩展AbstractModel可以删除此错误。 但我想避免使用此解决方案，因为AbstractModel中的字段对于我的应用程序中的所有表都是通用的。

[更新] App Engine版本是1.9.11，存储是cloudSQL。表定义如下。

CREATE TABLE `EMPLOYEE` (
  `address` varchar(50) NOT NULL,
  `name` varchar(50) NOT NULL,
  `position` varchar(45) DEFAULT NULL,
  `id` int(11) NOT NULL,
  `lastModifiedBy` varchar(45) NOT NULL,
  `createTimestamp` datetime NOT NULL,
  `modifyTimestamp` datetime NOT NULL,
  `version` int(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

[UPDATE2] 我已将DataNucleus更新到版本4.0.2，但发生了类似的错误。我没有重复的字段和dnFieldFlags。

javax.persistence.PersistenceException: Result Class query field names are not case sensitive. It does not allow fields with same name, but in a different case. For instance, the field "dnFieldFlags" is conflicting.
    at org.datanucleus.api.jpa.NucleusJPAHelper.getJPAExceptionForNucleusException(NucleusJPAHelper.java:308)
    at org.datanucleus.api.jpa.JPAQuery.getResultList(JPAQuery.java:213)
    at (my app : List<class with inheritance> list = q.getResultList();)
    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 com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:115)
    at com.google.api.server.spi.SystemService.invokeServiceMethod(SystemService.java:359)
    at com.google.api.server.spi.SystemServiceServlet.execute(SystemServiceServlet.java:160)
    at com.google.api.server.spi.SystemServiceServlet.doPost(SystemServiceServlet.java:118)
    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:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:127)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
    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 com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
    at org.mortbay.jetty.servlet.ServletHandler$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.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:98)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:491)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: org.datanucleus.exceptions.NucleusUserException: Result Class query field names are not case sensitive. It does not allow fields with same name, but in a different case. For instance, the field "dnFieldFlags" is conflicting.
    at org.datanucleus.store.rdbms.query.ResultClassROF.populateDeclaredFieldsForUserType(ResultClassROF.java:507)
    at org.datanucleus.store.rdbms.query.ResultClassROF.populateDeclaredFieldsForUserType(ResultClassROF.java:512)
    at org.datanucleus.store.rdbms.query.ResultClassROF.access$100(ResultClassROF.java:65)
    at org.datanucleus.store.rdbms.query.ResultClassROF$1.run(ResultClassROF.java:225)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.datanucleus.store.rdbms.query.ResultClassROF.<init>(ResultClassROF.java:221)
    at org.datanucleus.store.rdbms.query.RDBMSQueryUtils.getResultObjectFactoryForNoCandidateClass(RDBMSQueryUtils.java:547)
    at org.datanucleus.store.rdbms.query.SQLQuery.performExecute(SQLQuery.java:289)
    at org.datanucleus.store.query.Query.executeQuery(Query.java:1840)
    at org.datanucleus.store.query.AbstractSQLQuery.executeWithMap(AbstractSQLQuery.java:356)
    at org.datanucleus.api.jpa.JPAQuery.getResultList(JPAQuery.java:197)
    ... 48 more

1 个答案:

答案 0 :(得分：0)

我尝试过EclipseLink。上面的代码工作正常。

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