hibernate Interceptor 问题

Question

02:00:48,062 DEBUG SessionFactoryImpl:308 - instantiated session factory
02:00:48,062 DEBUG SessionFactoryImpl:390 - Checking 0 named HQL queries
02:00:48,062 DEBUG SessionFactoryImpl:410 - Checking 0 named SQL queries
02:00:48,156 DEBUG SessionImpl:220 - opened session at timestamp: 11587752480
02:00:48,156 DEBUG JDBCTransaction:54 - begin
02:00:48,156 DEBUG ConnectionManager:415 - opening JDBC connection
02:00:48,156 DEBUG DriverManagerConnectionProvider:93 - total checked-out connec
tions: 0
02:00:48,171 DEBUG DriverManagerConnectionProvider:99 - using pooled JDBC connec
tion, pool size: 0
02:00:48,171 DEBUG JDBCTransaction:59 - current autocommit status: false
02:00:48,171 DEBUG JDBCContext:210 - after transaction begin
02:00:48,171 DEBUG DefaultSaveOrUpdateEventListener:161 - saving transient insta
nce
02:00:48,171 DEBUG IncrementGenerator:80 - fetching initial value: select max(id
) from pho
02:00:48,171 DEBUG AbstractBatcher:358 - about to open PreparedStatement (open P
reparedStatements: 0, globally: 0)
02:00:48,171 ERROR AssertionFailure:22 - an assertion failure occured (this may
indicate a bug in Hibernate, but is more likely due to unsafe use of the session
)
org.hibernate.AssertionFailure: Interceptor.onPrepareStatement() returned null o
r empty string.
        at org.hibernate.jdbc.AbstractBatcher.getSQL(AbstractBatcher.java:453)
        at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatch
er.java:473)
        at org.hibernate.jdbc.AbstractBatcher.prepareSelectStatement(AbstractBat
cher.java:123)
        at org.hibernate.id.IncrementGenerator.getNext(IncrementGenerator.java:8
3)
        at org.hibernate.id.IncrementGenerator.generate(IncrementGenerator.java:
44)
        at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId
(AbstractSaveEventListener.java:98)
        at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGene
ratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
        at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrR
equestedId(DefaultSaveEventListener.java:33)
        at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTran
sient(DefaultSaveOrUpdateEventListener.java:175)
        at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(
DefaultSaveEventListener.java:27)
        at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpda
te(DefaultSaveOrUpdateEventListener.java:70)
        at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
        at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
        at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
        at Test.doGet(Test.java:51)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:214)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:825)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:738)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:526)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFol
lowerWorkerThread.java:80)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:684)
        at java.lang.Thread.run(Thread.java:595)
org.hibernate.AssertionFailure: Interceptor.onPrepareStatement() returned null o
r empty string.
        at org.hibernate.jdbc.AbstractBatcher.getSQL(AbstractBatcher.java:453)
        at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatch
er.java:473)
        at org.hibernate.jdbc.AbstractBatcher.prepareSelectStatement(AbstractBat
cher.java:123)
        at org.hibernate.id.IncrementGenerator.getNext(IncrementGenerator.java:8
3)
        at org.hibernate.id.IncrementGenerator.generate(IncrementGenerator.java:
44)
        at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId
(AbstractSaveEventListener.java:98)
        at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGene
ratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
        at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrR
equestedId(DefaultSaveEventListener.java:33)
        at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTran
sient(DefaultSaveOrUpdateEventListener.java:175)
        at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(
DefaultSaveEventListener.java:27)
        at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpda
te(DefaultSaveOrUpdateEventListener.java:70)
        at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
        at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
        at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
        at Test.doGet(Test.java:51)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:214)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:825)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:738)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:526)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFol
lowerWorkerThread.java:80)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:684)
        at java.lang.Thread.run(Thread.java:595)