OsWorkFlow学习（数据库设置）

OsWorkFlow官方网站：http://www.opensymphony.com/osworkflow/
从网上找到OsWorkFlow的一些介绍性文摘，例如：http://my.so-net.net.tw/idealist/OSWorkflow/。开始自己第一个OsWorkFlow程序。
环境：jboss 4.0.1 sp1，Ms sql server 2000 sp4
一、数据库设置（注意红色字体）：
    1、 deploy/mssql-ds.xml配置：
<datasources>
  <local-tx-datasource>
    <jndi-name>MSSQLDS</jndi-name>
    <connection-url>jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=OSWorkflow</connection-url>
    <driver-class>com.microsoft.jdbc.sqlserver.SQLServerDriver</driver-class>
    <user-name>sa</user-name>
    <password>11</password>
  </local-tx-datasource>
</datasources> 
    2、classes/osworkflow.xml配置：
<osworkflow>
<!--
<persistence class="com.opensymphony.workflow.spi.memory.MemoryWorkflowStore"/>
-->
<persistence class="com.opensymphony.workflow.spi.jdbc.JDBCWorkflowStore">

 <property key="datasource" value="java:MSSQLDS"/>
 <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) + 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="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>
    <factory class="com.opensymphony.workflow.loader.XMLWorkflowFactory">
        <property key="resource" value="workflows.xml" />
    </factory>
</osworkflow>    
   3、classes/propertyset.xml配置
<propertysets>
 <propertyset name="jdbc" class="com.opensymphony.module.propertyset.database.JDBCPropertySet">
  <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"/>
  <arg name="datasource" value="java:MSSQLDS"/>
  <arg name="" value=""/>
 </propertyset>
</propertysets>
在未增加/propertyset.xml文件时，浏览文件执行流程会抛出以下的异常：
23:18:19,380 FATAL [JDBCPropertySet] Error looking up DataSource atjdbc/DefaultDS
javax.naming.NameNotFoundException: jdbc not bound
        at org.jnp.server.NamingServer.getBinding(NamingServer.java:491)
        at org.jnp.server.NamingServer.getBinding(NamingServer.java:499)
        at org.jnp.server.NamingServer.getObject(NamingServer.java:505)
        at org.jnp.server.NamingServer.lookup(NamingServer.java:249)
        at org.jnp.server.NamingServer.lookup(NamingServer.java:252)
        at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:544)
        at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:658)
        at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:520)
        at javax.naming.InitialContext.lookup(InitialContext.java:347)
        at com.opensymphony.module.propertyset.database.JDBCPropertySet.lookup(J
DBCPropertySet.java:536)
系统根本就没有设置过jdbc/DefaultDS的数据源，OsWorlFlow把jdbc/DefaultDS作为默认的数据源了。