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why the following error occured in tomcat application?

bhaskar sanghi
Greenhorn

Joined: Dec 07, 2005
Posts: 11
why the following error occured in tomcat application?

org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class '
' for connect URL 'null'
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.jav
a:780)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:5
40)
at com.bob.hrms.DBUtil.getConnection(DBUtil.java:21)
at com.bob.hrms.master.RetClientMasterInfo.doGet(RetClientMasterInfo.java:22)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex
t.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContext
Valve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex
t.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137
)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex
t.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118
)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex
t.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex
t.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne
ction(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:683)
at java.lang.Thread.run(Unknown Source)
Caused by: java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getDriver(Unknown Source)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.jav
a:773)
... 29 more
David O'Meara
Rancher

Joined: Mar 06, 2001
Posts: 13459

It doesn't look like your DataSource is configured correctly. Did you want to paste the settings and some (small) sample code showing how you're calling it?

Dave
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: why the following error occured in tomcat application?