今天被osworkflow的数据库配置(mysql)困住了

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今天研究了一下osworkflow,想运行一下他的例子程序看看效果。结果在配置与数据库连接方面出了问题,郁闷至极。

我用的是mysql数据库,按照
http://www.opensymphony.com/osworkflow/1.3%20Running%20the%20Example%20App.html一步一步的配置。
我的配置文件具体如下:
1:在tomcat的conf目录下修改server.xml,增加以下内容
<Context path="/osworkflow_example" docBase="osworkflow-2.7.0-example" 
         debug= "99" reloadable="true" crossContext="true"  verbosity="DEBUG">
<!-- debug level is set to paranoid, to know what is happening, 
     turn it off once you do not need it -->
<Logger className="org.apache.catalina.logger.FileLogger"
        prefix="OSWorkflow." suffix=".log" timestamp="true"/>
<!-- 
    put log4j.jar into:
    TOMCAT_ROOT/webapp/osworkflow-2.7.0-example/WEB-INF/lib 
    if you want to use it for logging 
-->
  <Resource name="jdbc/DefaultDS"
               auth="Container"
               type="javax.sql.DataSource"/>

  <ResourceParams name="jdbc/DefaultDS">
    
    <parameter>
      <name>factory</name>      
      <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
    </parameter>
    
    <!--
    <parameter>
         <name>factory</name>
         <value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
           </parameter>
           -->
    <!-- Maximum number of dB connections in pool. Make sure you
         configure your mysqld max_connections large enough to handle
         all of your db connections. Set to 0 for no limit.
         -->
    <parameter>
      <name>maxActive</name>
      <value>100</value>
    </parameter>
    <!-- Maximum number of idle dB connections to retain in pool.
         Set to 0 for no limit.
         -->
    <parameter>
      <name>maxIdle</name>
      <value>30</value>
    </parameter>
    <!-- Maximum time to wait for a dB connection to become available
         in ms, in this example 10 seconds. An Exception is thrown if
         this timeout is exceeded.  Set to -1 to wait indefinitely.
         -->
    <parameter>
      <name>maxWait</name>
      <value>10000</value>
    </parameter>
    <!-- MySQL dB username and password for dB connections  -->
    <parameter>
     <name>username</name>
     <value>root</value>
    </parameter>
    <parameter>
     <name>password</name>
     <value></value>
    </parameter>
    <!-- Class name for mm.mysql JDBC driver -->
    <parameter>
       <name>driverClassName</name>
       <value>org.gjt.mm.mysql.Driver</value>
    </parameter>
    <!-- The JDBC connection url for connecting to your MySQL dB.
         The autoReconnect=true argument to the url makes sure that the
         mm.mysql JDBC Driver will automatically reconnect if mysqld closed the
         connection.  mysqld by default closes idle connections after 8 hours.
         -->
    <parameter>
      <name>url</name>
      <value>jdbc:mysql://localhost:3306/osworkflow?autoReconnect=true</value>
    </parameter>
  </ResourceParams>
</Context>

2:配置osworkflow.xml(在WEB-INF\classes目录下),内容如下:
<osworkflow>
<persistence class="com.opensymphony.workflow.spi.jdbc.MySQLWorkflowStore">
<!-- For jdbc persistence, all are required. -->
<property key="datasource" value="jdbc/DefaultDS"/>
<property key="entry.sequence" 
                       value="select count(*) + 1 from os_wfentry"/>
<property key="entry.table" value="OS_WFENTRY"/>
<property key="entry.id" value="ID"/>
<property key="entry.name" value="NAME"/>
<property key="entry.state" value="STATE"/>
<!--
<property key="step.sequence" value="select sum(c1) from 
(select 1 tb, count(*) c1 from os_currentstep 
union select 2 tb, count(*) c1 from os_historystep)"/>
-->
<property key="step.sequence" value="select sum(c1) + 1 from (select 1 as
tb, count(*) as c1 from os_currentstep union select 2 as tb, count(*) as c1
from os_historystep) as TabelaFinal" />

<property key="step.sequence.increment" value="INSERT INTO OS_STEPIDS (ID) values (null)"/>
   <property key="step.sequence.retrieve"  value="SELECT max(ID) FROM OS_STEPIDS"/>
<property key="history.table" value="OS_HISTORYSTEP"/>
<property key="current.table" value="OS_CURRENTSTEP"/>
<property key="historyPrev.table" value="OS_HISTORYSTEP_PREV"/>
<property key="currentPrev.table" value="OS_CURRENTSTEP_PREV"/>
<property key="step.id" value="ID"/>
<property key="step.entryId" value="ENTRY_ID"/>
<property key="step.stepId" value="STEP_ID"/>
<property key="step.actionId" value="ACTION_ID"/>
<property key="step.owner" value="OWNER"/>
<property key="step.caller" value="CALLER"/>
<property key="step.startDate" value="START_DATE"/>
<property key="step.finishDate" value="FINISH_DATE"/>
<property key="step.dueDate" value="DUE_DATE"/>
<property key="step.status" value="STATUS"/>
<property key="step.previousId" value="PREVIOUS_ID"/>

</persistence>
</osworkflow>


3:增加propertyset.xml(在WEB-INF\classes目录下),内容如下:
<propertysets>
    <propertyset name="jdbc" class="com.opensymphony.module.propertyset.database.JDBCPropertySet">
        <arg name="datasource" value="jdbc/DefaultDS"/>
        <arg name="table.name" value="OS_PROPERTYENTRY"/>
        <arg name="col.globalKey" value="GLOBAL_KEY"/>
        <arg name="col.itemKey" value="ITEM_KEY"/>
        <arg name="col.itemType" value="ITEM_TYPE"/>
        <arg name="col.string" value="STRING_VALUE"/>
        <arg name="col.date" value="DATE_VALUE"/>
        <arg name="col.data" value="DATA_VALUE"/>
        <arg name="col.float" value="FLOAT_VALUE"/>
        <arg name="col.number" value="NUMBER_VALUE"/>
    </propertyset>
</propertysets>


4:修改web.xml,内容如下:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd";>
<web-app> 


  <display-name>OSWorkflow Example App</display-name>
  <welcome-file-list>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
 
<resource-ref>
<description>OSWorkflow Example App</description>
<res-ref-name>jdbc/DefaultDS</res-ref-name>
<res-ref-type>javax.sql.DataSource</res-ref-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>

5:将jboss-j2ee.jar拷贝到tomcat_home\common\endorsed目录下
6:将驱动程序拷贝到tomcat_home\common\lib目录下

7:启动tomcat但是报以下错误
严重: Parse error in application web.xml
java.lang.NullPointerException
        at org.apache.commons.digester.Digester.createSAXException(Digester.java
:2540)
        at org.apache.commons.digester.Digester.createSAXException(Digester.java
:2566)
        at org.apache.commons.digester.Digester.endElement(Digester.java:1061)
        at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source
)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.endNamespaceScope(Unknown
Source)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.handleEndElement(Unknown S
ource)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.endElement(Unknown Source)

        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(
Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContent
Dispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Un
known Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.commons.digester.Digester.parse(Digester.java:1548)
        at org.apache.catalina.startup.ContextConfig.applicationConfig(ContextCo
nfig.java:263)
        at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:62
4)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfi
g.java:216)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:119)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
290)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase
.java:823)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:80
7)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)

        at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDep
loyer.java:277)
        at org.apache.catalina.core.StandardHost.install(StandardHost.java:832)
        at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:625
)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:431
)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:983)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java
:349)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:119)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1091)

        at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)

        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478
)
        at org.apache.catalina.core.StandardService.start(StandardService.java:4
80)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:231
3)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)
2005-1-26 10:57:44 org.apache.catalina.startup.ContextConfig applicationConfig
严重: Occurred at line 16 column 16
2005-1-26 10:57:44 org.apache.catalina.startup.ContextConfig start
严重: Marking this application unavailable due to previous error(s)
2005-1-26 10:57:44 org.apache.catalina.core.StandardContext start
严重: Error getConfigured
2005-1-26 10:57:44 org.apache.catalina.core.StandardContext start
严重: Context startup failed due to previous errors



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