如何获取无效数据转换的OpenJPA异常的确切详细信息？

Question

我通过连接到DB2数据库的OpenJPA得到了一个SELECT语句的java异常。

有人可以指导我如何正确地找到哪一列是不匹配？

错误代码ERRORCODE=-4461并没有真正详细说明。

org.apache.openjpa.persistence.PersistenceException: [jcc][t4][1092][11644][3.57.82] Invalid data conversion: Wrong result column type for requested conversion. ERRORCODE=-4461, SQLSTATE=42815 
    at org.apache.openjpa.jdbc.sql.DBDictionary.narrow(DBDictionary.java:4827) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.jdbc.sql.DBDictionary.newStoreException(DBDictionary.java:4787) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.jdbc.sql.DB2Dictionary.newStoreException(DB2Dictionary.java:563) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:136) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:86) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:347) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at com.ibm.ws.persistence.jdbc.kernel.WsJpaJDBCStoreManager.initialize(WsJpaJDBCStoreManager.java:147) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:112) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:1005) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:963) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:880) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.kernel.DelegatingBroker.find(DelegatingBroker.java:223) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at org.apache.openjpa.persistence.EntityManagerImpl.find(EntityManagerImpl.java:476) ~[com.ibm.ws.jpa.jar:1.0.1-SNAPSHOT] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.0] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48) ~[na:1.6.0] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[na:1.6.0] 
    at java.lang.reflect.Method.invoke(Method.java:600) ~[na:1.6.0] 
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:365) ~[org.springframework.orm-3.1.2.RELEASE.jar:3.1.2.RELEASE] 
    at $Proxy45.find(Unknown Source) ~[na:na] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.0] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48) ~[na:1.6.0] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[na:1.6.0] 
    at java.lang.reflect.Method.invoke(Method.java:600) ~[na:1.6.0] 
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240) ~[org.springframework.orm-3.1.2.RELEASE.jar:3.1.2.RELEASE] 
    at $Proxy45.find(Unknown Source) ~[na:na] 

我已经看过this和this。

我也可以看到在persistence.xml中启用<property name="openjpa.jdbc.DBDictionary" value="db2(SupportsSelectStartIndex=true,SupportsSelectEndIndex=true)"/>会产生问题。评论解决了这个问题。这用于从结果集中选择前10行。语法SELECT TOP 10 FROM SOME_TABLE不直接与DB2一起使用。 但是，为什么这确实会导致问题并不确定。

Answer 1

有人可以指导我如何正确地找到哪一列是 不匹配？

你能公开课JDBCStoreManager在IDEA并设置断点在第一种方法初始化的行（）的时候打电话给你SELECT声明？我认为，在调试模式下你可以很容易地发现问题。