jbpm4部署

初学jbpm4，根据官方给出的example添加了相应的配置文件和依赖库，hibernet配置文件内容如下：
<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration>
  <session-factory>
  
     <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
     <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
     <property name="connection.url">jdbc:mysql://127.0.0.1:3306/jbpmdb2</property>
     <property name="hibernate.connection.username">jbpm</property>
     <property name="hibernate.connection.password">jbpm</property>
     <property name="hibernate.hbm2ddl.auto">create-drop</property>
     <property name="hibernate.format_sql">true</property>
     <property name="hibernate.show_sql">true</property>
     
     
     <mapping resource="jbpm.repository.hbm.xml" />
     <mapping resource="jbpm.execution.hbm.xml" />
     <mapping resource="jbpm.history.hbm.xml" />
     <mapping resource="jbpm.task.hbm.xml" />
     <mapping resource="jbpm.identity.hbm.xml" />
     
  </session-factory>
</hibernate-configuration>
Java类很简单，基本就下面一句话：
ProcessEngine processengine = org.jbpm.api.Configuration.getProcessEngine();
执行这句话就出现如下错误。郁闷了三天啊，还是找不到答案。哪位好心的大哥快来救命啊...好处大大的有哦..### EXCEPTION ###########################################
12:31:09,567 INF | [Parser] couldn't set schema language property
org.xml.sax.SAXNotRecognizedException: http://java.sun.com/xml/jaxp/properties/schemaLanguage
at org.apache.xerces.framework.XMLParser.setProperty(XMLParser.java:1714)
at org.apache.xerces.parsers.SAXParser.setProperty(SAXParser.java:770)
at org.apache.xerces.jaxp.SAXParserImpl.setProperty(SAXParserImpl.java:190)
at org.jbpm.pvm.internal.xml.Parser.buildDom(Parser.java:422)
at org.jbpm.pvm.internal.xml.Parser.execute(Parser.java:389)
at org.jbpm.pvm.internal.xml.Parse.execute(Parse.java:158)
at org.jbpm.pvm.internal.wire.xml.WireParser.<clinit>(WireParser.java:284)
at org.jbpm.pvm.internal.cfg.ConfigurationParser.<init>(ConfigurationParser.java:46)
at org.jbpm.pvm.internal.cfg.ConfigurationParser.<clinit>(ConfigurationParser.java:49)
at org.jbpm.pvm.internal.cfg.ConfigurationImpl.parse(ConfigurationImpl.java:139)
at org.jbpm.pvm.internal.cfg.ConfigurationImpl.setResource(ConfigurationImpl.java:118)
at org.jbpm.pvm.internal.cfg.ConfigurationImpl.setResource(ConfigurationImpl.java:52)
at org.jbpm.api.Configuration.setResource(Configuration.java:74)
at org.jbpm.api.Configuration.getProcessEngine(Configuration.java:121)
at com.qyb.MyTest.<init>(MyTest.java:23)
at com.qyb.MyTest.main(MyTest.java:45)尤其是“couldn't set schema language property” 这是什么东西啊？