网上找到使用TOMCAT配置DB2的资料很少，很多人挂“羊头“卖“狗肉”，这是老大花了一定的时间研究之后才搞定的，所以发出来避免大家走弯路，虽然是转载，希望能发到首页，避免大家走弯路
转自老大的blog,顺便打打广告
http://163hbfang.blog.163.com/blog/static/2448133200621134590/
上面还是有很多有技术价值的东西，不过因为在163所以很少人光顾，帮他打广告^_^
1、操作系统Windows2000（经测试，在Linux不需操作第6点)
2、Tomcat版本：Apache Tomcat/5.0.16
3、JDK版本：j2sdk1.4.1_03
4、DB2版本：使用db2inst1用户输入db2level命令得到：DB2 v8.1.0.96，修订包为"10"
5、在安装DB2的机器上/opt/IBM/db2/V8.1/java目录下拷贝db2java.zip、db2jcc.jar到$CATALINA_HOME/common/lib下，并重命名db2java.zip为db2java.jar
6、把db2java.jar加classpath
.;C:\j2sdk1.4.1_03\lib\dt.jar;D:\tomcat5\common\lib\db2jcc.jar;D:\tomcat5\common\lib\db2java.jar;
7、手工配置zjdii.xml，不要在$CATALINA_HOME/conf/server.xml修改任何信息；在$CATALINA_HOME/conf/localhost下修改或新建zjdii.xml
<Context displayName="ZJDII" docBase="zjdii" path="/zjdii">
<Logger className="org.apache.catalina.logger.FileLogger" prefix="localhost_zjdii_log." suffix=".txt" timestamp="true"/>
<Resource auth="Container" name="jdbc/zjdii" type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/zjdii">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:db2://192.168.200.113:6789/zjdii</value>
</parameter>
<parameter>
<name>password</name>
<value>yourpasswd</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>1000</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>10</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>COM.ibm.db2.jdbc.net.DB2Driver</value>
</parameter>
<parameter>
<name>username</name>
<value>yourusername</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>30</value>
</parameter>
</ResourceParams>
</Context>
常见错误信息及解决方案：
org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'COM.i
bm.db2.jdbc.net.DB2Driver', cause:
java.lang.ClassNotFoundException: COM.ibm.db2.jdbc.net.DB2Driver
at org.apache.catalina.loader.StandardClassLoader.loadClass(StandardClas
sLoader.java:891)
at org.apache.catalina.loader.StandardClassLoader.loadClass(StandardClas
sLoader.java:756)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:140)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSou
rce.java:730)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource
.java:518)
at com.zjdii.db.DataBase.getConnection(Database.java:44)
at com.zjdii.db.DBFactory.getPreparedStatement(DBFactory.java:86)
at org.apache.jsp.test.clob.clob_jsp._jspService(clob_jsp.java:50)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:311)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
01)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:284)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:204)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:256)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:564)
at org.apache.catalina.core.StandardContextValve.invokeInternal(Standard
ContextValve.java:245)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:199)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:564)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:195)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:164)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:564)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:156)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:564)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:21
1)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:805)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:696)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:605)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:677)
at java.lang.Thread.run(Thread.java:536)
java.lang.NullPointerException
解决方案：
把D:\tomcat5\webapps\common\lib\db2java.jar;加入classpath里
javax.servlet.ServletException: com/ibm/db2/jcc/SQLJPackage
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:867)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:800)
org.apache.jsp.test.clob.clob_jsp._jspService(clob_jsp.java:82)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause
java.lang.NoClassDefFoundError: com/ibm/db2/jcc/SQLJPackage
COM.ibm.db2.jdbc.net.DB2Connection.prepareStatement(DB2Connection.java:627)
org.apache.commons.dbcp.DelegatingConnection.prepareStatement(DelegatingConnection.java:216)
org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.prepareStatement(PoolingDataSource.java:323)
com.zjdii.db.DBFactory.getPreparedStatement(DBFactory.java:167)
org.apache.jsp.test.clob.clob_jsp._jspService(clob_jsp.java:50)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
note The full stack trace of the root cause is available in the Tomcat logs.
解决方案：
把D:\tomcat5\webapps\common\lib\db2jcc.jar;加入classpath里