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>