我正在使用java7，jboss7，ojdbc7，hibernate 4。
表有一个CLOB列，在域类中，代码是这样的:
@高球
私有(private)字符串MyClob;
我在查询时遇到这个奇怪的错误，并且不一致。
Caused by: javax.persistence.PersistenceException: org.hibernate.HibernateException: IOException occurred reading text
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1387)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1310)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:273)
at org.hibernate.ejb.criteria.CriteriaQueryCompiler$3.getResultList(CriteriaQueryCompiler.java:254)
...
... 102 more
Caused by: org.hibernate.HibernateException: IOException occurred reading text
at org.hibernate.type.descriptor.java.DataHelper.extractString(DataHelper.java:94)
at org.hibernate.type.descriptor.java.DataHelper.extractString(DataHelper.java:280)
at org.hibernate.type.descriptor.java.StringTypeDescriptor.wrap(StringTypeDescriptor.java:89)
at org.hibernate.type.descriptor.java.StringTypeDescriptor.wrap(StringTypeDescriptor.java:39)
at org.hibernate.type.descriptor.sql.ClobTypeDescriptor$1.doExtract(ClobTypeDescriptor.java:60)
at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:64)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:261)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:257)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:247)
at org.hibernate.type.AbstractStandardBasicType.hydrate(AbstractStandardBasicType.java:332)
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2912)
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1672)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1604)
at org.hibernate.loader.Loader.getRow(Loader.java:1504)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:712)
at org.hibernate.loader.Loader.processResultSet(Loader.java:942)
at org.hibernate.loader.Loader.doQuery(Loader.java:910)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:341)
at org.hibernate.loader.Loader.doList(Loader.java:2522)
at org.hibernate.loader.Loader.doList(Loader.java:2508)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2338)
at org.hibernate.loader.Loader.list(Loader.java:2333)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:490)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1269)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:264)
... 104 more
Caused by: java.io.IOException: Protocol violation: [ 14, 47, ]
at oracle.jdbc.driver.OracleClobReader.needChars(OracleClobReader.java:264)
at oracle.jdbc.driver.OracleClobReader.read(OracleClobReader.java:195)
at org.hibernate.type.descriptor.java.DataHelper.extractString(DataHelper.java:86)
... 131 more
Caused by: java.sql.SQLException: Protocol violation: [ 14, 47, ]
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:669)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:249)
at oracle.jdbc.driver.T4C8TTIClob.read(T4C8TTIClob.java:245)
at oracle.jdbc.driver.T4CConnection.getChars(T4CConnection.java:3901)
at oracle.sql.CLOB.getChars(CLOB.java:517)
at oracle.jdbc.driver.OracleClobReader.needChars(OracleClobReader.java:245)
最佳答案
ojdbc7 jar的问题。
如果clob的长度是4193个字符，则驱动程序无法检索。
使用新的OJDBC7修补程序 jar