DEBUG -- CLOSE BY CLIENT STACK TRACE问题的两种解决方案,整理自网络
1.DEBUG -- CLOSE BY CLIENT STACK TRACE
最近用c3p0遇到各种奇怪的问题,也不知道是它不行还是我不行。
今天又遇到了一个“DEBUG -- CLOSE BY CLIENT STACK TRACE”这个错误。
在网上找了找,大家都是抄的一篇文章,也不知道问题解决没解决,反正很多人都抄了这篇文章:
http://hi.baidu.com/xhr8334/blog/item/cf15d1a6deb235fc9052ee9b.html
将日志级别提升,就算解决问题了吗?最多只能算是眼不见心不烦。
研究后我发现了一个不报这个错的方法:
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${jdbc.driverClassName}"/>
<property name="jdbcUrl" value="${jdbc.url}" />
<property name="user" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="minPoolSize" value="${c3p0.minPoolSize}"/>
<property name="maxPoolSize" value="${c3p0.maxPoolSize}"/>
<property name="initialPoolSize" value="${c3p0.initialPoolSize}"/>
<property name="maxIdleTime" value="${c3p0.maxIdleTime}"/>
<property name="maxStatements" value="${c3p0.max_statement}"/>
</bean>
将配置文件中的红字去掉就好了。
原理请看:http://blog.csdn.net/hallelujah_chen/article/details/6016132
2.ORACLE CLOSE BY CLIENT STACK TRACE
部署一个项目启动的时候debug打印出好多错误
其中,CLOSE BY CLIENT STACK TRACE 是第一错误
使用的是Myeclipse 8.5
框 架: hibernate 3.0 ,spring 3.0 ,maven2 等
web服务器 :resin3.1.10
错误信息如下所示:
Exception代码
java.lang.Exception: DEBUG -- CLOSE BY CLIENT STACK TRACE
at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:566)
at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:234)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.destroyResource(C3P0PooledConnectionPool.java:470)
at com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask.run(BasicResourcePool.java:964)
at com.mchange.v2.resourcepool.BasicResourcePool.destroyResource(BasicResourcePool.java:989)
at com.mchange.v2.resourcepool.BasicResourcePool.access$100(BasicResourcePool.java:32)
at com.mchange.v2.resourcepool.BasicResourcePool$5.run(BasicResourcePool.java:1174)
…………
Caused by: org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available.
Add CGLIB to the class path or specify proxy interfaces.
java.lang.Exception: DEBUG -- CLOSE BY CLIENT STACK TRACE
at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:566)
at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:234)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.destroyResource(C3P0PooledConnectionPool.java:470)
at com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask.run(BasicResourcePool.java:964)
at com.mchange.v2.resourcepool.BasicResourcePool.destroyResource(BasicResourcePool.java:989)
at com.mchange.v2.resourcepool.BasicResourcePool.access$100(BasicResourcePool.java:32)
at com.mchange.v2.resourcepool.BasicResourcePool$5.run(BasicResourcePool.java:1174)
…………
Caused by: org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available.
Add CGLIB to the class path or specify proxy interfaces.
解决方法:
在maven2的配置文件中,初始化下载的一些jar包中,加入cglib2.2 jar包的下载
Xml代码
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.2</version>
</dependency>
再次启动时,debug报错消失
在resin服务器的lib下发现,当配置 上面的xml时候,会有包 cglib-2.2.jar 加载过来
可见,以上的错误信息是由于缺少这个包造成的,在相应的 lib中加入该包,就不会有这个问题了。