Hibernate core 3.3.2.GA 与 3.6.0.Final引起的一个血案

1、背景

  Web项目M 引用Sub工程，Sub工程打包成Jar形式被M引用。

Sub里有这样一段获取服务器时间的代码；

Date date = null;

Session session =  this.getSessionFactory().openSession();

 

String sql = "select sysdate as mydate from dual";

SQLQuery query = session.createSQLQuery(sql);

 

try {

query.addScalar("mydate",Hibernate.TIMESTAMP);

date = (Date) query.uniqueResult();

System.out.println("XXXX:"+org.hibernate.Hibernate.TIMESTAMP.getClass());

} catch (HibernateException e) {

// TODO Auto-generated catch block

e.printStackTrace();

date = new Date();

} finally {

session.close();

}

Sub中用的是Hibernate 3.6.0 Final版本,IVY依赖以下

<dependency org="org.hibernate" name="hibernate-core" rev=" 3.6.0 Final" conf="compile->default"/>

只是参与编译，不会编译到Sub jar中。

M依赖的是Hibernate 3.3.2.GA版本，

<dependency org="org.hibernate" name="hibernate-core" rev=" 3.3.2.GA" conf="zip->default"/>

二，现象。

那么，问题来了，目前依赖状况会致使M 项目起不来，报错为：

信息: Illegal access: this web application instance has been stopped already.  Could not load org.apache.commons.pool2.impl.DefaultPooledObject.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.

java.lang.IllegalStateException

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1750)

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1709)

at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:80)

at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:836)

at org.apache.commons.pool2.impl.GenericObjectPool.ensureIdle(GenericObjectPool.java:895)

at org.apache.commons.pool2.impl.GenericObjectPool.ensureMinIdle(GenericObjectPool.java:874)

at org.apache.commons.pool2.impl.BaseGenericObjectPool$Evictor.run(BaseGenericObjectPool.java:1055)

at java.util.TimerThread.mainLoop(Unknown Source)

at java.util.TimerThread.run(Unknown Source)

若是把M中对Hibernate的依赖也换成 3.6.0.Final则在运行到上边代码段时会出现  java.lang.NoSuchFieldError: TIMESTAMP。

3、应对策略

以前有同事提醒我说，Sub中Hibernate Core只参与编译，因此一直没往sub中考虑，无奈怎么试都有问题，最后想到把Sub中HibernateCore换成3.3.2.GA版本，问题消失，而后，为啥会这样？留个尾巴，继续找吧，找到了再来更新。