jbpm4和tomcat6整合出问题了

Question

我开始用tomcat+spring的一个项目中加入jbpm4.jbpm4和spring终于整合成功了，因为我测试了一次，运行一个简单流程没问题。然后我启动tomcat服务器，就出现以下错误提示：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jbpmConfiguration' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.jbpm.pvm.internal.cfg.SpringConfiguration]: Constructor threw exception; nested exception is java.lang.NoSuchMethodError: org.apache.log4j.Logger.trace(Ljava/lang/Object;)V
说找不到org.apache.log4j.Logger.trace(Ljava/lang/Object;)方法，我明明引入了那个包，而且也有那个方法。对了，关于tomcat和jbpm4冲突的那几个包（juel）我都调换了，tomcat我也重新卸载重装了，问题依旧。期待那位仁兄能帮我解释一下。
附上配置文件：application.xml
<?xml version="1.0" encoding="UTF-8"?>
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<bean id="dataSource"
    class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName"
        value="com.mysql.jdbc.Driver">
    </property>
    <property name="url"
        value="jdbc:mysql://localhost:3306/jbpm4">
    </property>
    <property name="username" value="root"></property>
    <property name="password" value="19876"></property>
    <property name="maxActive" value="100"></property>
    <property name="maxIdle" value="30"></property>
    <property name="maxWait" value="50"></property>
    <property name="defaultAutoCommit" value="true"></property>
</bean>

<bean id="sessionFactory"
    class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">
                org.hibernate.dialect.MySQLInnoDBDialect
            </prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.format_sql">true</prop>
        </props>
    </property>
    <property name="mappingResources">
        <list>
            <value>jbpm.repository.hbm.xml</value>
            <value>jbpm.execution.hbm.xml</value>
            <value>jbpm.history.hbm.xml</value>
            <value>jbpm.task.hbm.xml</value>
            <value>jbpm.identity.hbm.xml</value>
            <value>bean/User.hbm.xml</value>
        </list>
    </property>
</bean>

<bean id="jbpmConfiguration" class="org.jbpm.pvm.internal.cfg.SpringConfiguration">
    <constructor-arg value="jbpm.cfg.xml"></constructor-arg>
</bean>

<bean id="processEngine" factory-bean="jbpmConfiguration" factory-method="buildProcessEngine"></bean>



     和jbpm.cfg.xml：
     <?xml version="1.0" encoding="UTF-8"?>

[b]问题补充：[/b]
问题自己解决了，是log4j包我不小心导了两个。

Answer 1

jar版本不一致了