关于tomcat6+proxool+log4j的问题

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关于tomcat6+proxool+log4j的问题15

在项目中使用了tomcat6+proxool+log4j-1.2.15的组合，碰见了以下问题

1.使用了proxool DataSource的 ObjectFactory configuration 配置方式(http://proxool.sourceforge.net/datasource.html#conf) ，即在server.xml中加如下配置

<context>
    <Resource
        name="jdbc/mydatasource"
        auth="Container"
        type="javax.sql.DataSource"
        factory="org.logicalcobwebs.proxool.ProxoolDataSource"
        proxool.alias="hrs"
        user="joe"
        password="******"
        delegateProperties="foo=bar"
        proxool.driver-url="jdbc:oracle:thin:@127.0.0.1:1521:DB"
        proxool.driver-class="oracle.jdbc.driver.OracleDriver"/>
</context>

这种配置方式要求把proxool-0.9.0RC3.jar,数据库驱动,commons-logging.jar 放在$CATALINA_HOME/lib目录下，放commons-logging是因为proxool中使用到了。此处出现了第一个问题，按照我的理解，commons-logging 会自动选择使用logging的库，如果找不到log4j应该会使用JDK的Logging API,但是我的实际情况是

严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@80fa6f for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category) (Caused by org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@80fa6f for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category))
	at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
	at org.springframework.web.context.ContextLoader.<init>(ContextLoader.java:139)
	at org.springframework.web.context.ContextLoaderListener.createContextLoader(ContextLoaderListener.java:57)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:48)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3830)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4337)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
	at org.apache.catalina.core.StandardService.start(StandardService.java:516)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:566)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@80fa6f for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category)
	at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:413)
	at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
	... 21 more
Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Category
	at java.lang.Class.getDeclaredConstructors0(Native Method)
	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2357)
	at java.lang.Class.getConstructor0(Class.java:2671)
	at java.lang.Class.getConstructor(Class.java:1629)
	at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:410)
	... 22 more
2008-7-3 12:28:15 org.apache.catalina.core.StandardContext start
严重: Error listenerStart

于是我不得不把log4j-1.2.15也放在了$CATALINA_HOME/lib目录下。
2.于是出现了在webapp的lib目录下是否要包含log4j.jar的问题，
如果不包含，根据tomcat6的classloader规则，大家使用统一个log4j,也就使用相同的log4j配置，无法针对不同的应用做不同的配置。
如果包含，又会出现以下错误

log4j:ERROR A "org.apache.log4j.xml.DOMConfigurator" object is not assignable to a "org.apache.log4j.spi.Configurator" variable.
log4j:ERROR The class "org.apache.log4j.spi.Configurator" was loaded by 
log4j:ERROR [org.apache.catalina.loader.StandardClassLoader@110d81b] whereas object of type 
log4j:ERROR "org.apache.log4j.xml.DOMConfigurator" was loaded by [WebappClassLoader
  delegate: false
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@110d81b
].
log4j:ERROR Could not instantiate configurator [org.apache.log4j.xml.DOMConfigurator].

请教一下，应该如何部署才能解决这些问题？
问题补充：
to lggege：依赖tomcat很多时候恰恰是避免部署的麻烦，因为tomcat配置只有一次，程序的部署可能会很频繁。

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