jbpm4.3与SSH整合问题

jbpm4.3与SSH整合出现如下问题：
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine' defined in URL [file:/D:/Tomcat%206.0/webapps/mytest/WEB-INF/classes/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [protected org.jbpm.api.ProcessEngine org.jbpm.pvm.internal.processengine.SpringHelper.createProcessEngine()] threw exception; nested exception is java.lang.AbstractMethodError: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [protected org.jbpm.api.ProcessEngine org.jbpm.pvm.internal.processengine.SpringHelper.createProcessEngine()] threw exception; nested exception is java.lang.AbstractMethodError: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;
Caused by: java.lang.AbstractMethodError: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;
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2010-12-11 18:11:06 org.apache.catalina.core.StandardContext start
严重: Error listenerStart
2010-12-11 18:11:06 org.apache.catalina.core.StandardContext start
严重: Context [/mytest] startup failed due to previous errorsapplicationContext.xml文件相关配置如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
      http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
      http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/jbpm"></property>
<property name="username" value="****"></property>
<property name="password" value="****"></property>
  <property name="maxActive" value="100"></property>
<property name="maxIdle" value="20"></property>
<property name="maxWait" value="500"></property>
<property name="defaultAutoCommit" value="true"></property>
</bean><!--jbpm4.3工作流  -->
<bean id="springHelper" class="org.jbpm.pvm.internal.processengine.SpringHelper">
<property name="jbpmCfg" value="spring-jbpm4.cfg.xml" />
</bean>
   <bean id="processEngine" factory-bean="springHelper" factory-method="createProcessEngine" /><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.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>

<property name="mappingLocations">
<list>
<value>classpath:jbpm.execution.hbm.xml</value>
<value>classpath:jbpm.history.hbm.xml</value>
<value>classpath:jbpm.identity.hbm.xml</value>
<value>classpath:jbpm.repository.hbm.xml</value>
<value>classpath:jbpm.task.hbm.xml</value>
</list>
</property>
</bean>
注释掉，就不报错了。
关键还是无法创建“processEngine”。<bean id="processEngine" factory-bean="springHelper" factory-method="createProcessEngine"/>