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
namefactory/name
valueorg.apache.commons.dbcp.BasicDataSourceFactory/value
/parameter
!--
parameter
namefactory/name
valueorg.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
namemaxActive/name
value100/value
/parameter
!-- Maximum number of idle dB connections to retain in pool.
Set to 0 for no limit.
--
parameter
namemaxIdle/name
value30/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
namemaxWait/name
value10000/value
/parameter
!-- MySQL dB username and password for dB connections --
parameter
nameusername/name
valueroot/value
/parameter
parameter
namepassword/name
value/value
/parameter
!-- Class name for mm.mysql JDBC driver --
parameter
namedriverClassName/name
valueorg.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
nameurl/name
valuejdbc:mysql://localhost:3306/osworkflow？autoReconnect=true/value
/parameter
/ResourceParams
/Context
2：配置osworkflow.xml(在WEB-INFclasses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-INFclasses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-nameOSWorkflow Example App/display-name
welcome-file-list
welcome-filedefault.jsp/welcome-file
/welcome-file-list
resource-ref
descriptionOSWorkflow Example App/description
res-ref-namejdbc/DefaultDS/res-ref-name
res-ref-typejavax.sql.DataSource/res-ref-type
res-authContainer/res-auth
/resource-ref
/web-app
5：将jboss-j2ee.jar拷贝到tomcat_homecommonendorsed目录下
6：将驱动程序拷贝到tomcat_homecommonlib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)
（本文来源于图老师网站，更多请访问http://m.tulaoshi.com/bianchengyuyan/）at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)
at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDep
（本文来源于图老师网站，更多请访问http://m.tulaoshi.com/bianchengyuyan/）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
