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Posted to users@tomcat.apache.org by Jayanta Halder <JH...@dfg.ca.gov> on 2002/06/14 02:26:02 UTC

Error found while connecting to mysql from JSP page deployedon tomcat

Hi,
 
I have installed tomcat on HP-UX box.I have deployed my web application
on tomcat container.I have copied mysql JDBC driver under common/lib
area.
 
While running the application i am getting following error ....
 
Cannot load JDBC driver class 'null'
java.lang.NullPointerException:
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at
org.apache.commons.dbcp.BasicDataSource.createDataSource(Unknown
Source)
        at
org.apache.commons.dbcp.BasicDataSource.getConnection(Unknown Source)
        at org.apache.jsp.index_0005fmysql$jsp._jspService(Unknown
Source)
        at org.apache.jasper.runtime.HttpJspBase.service(Unknown
Source)
        at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.jasper.servlet.JspServletWrapper.service(Unknown
Source)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(Unknown
Source)
        at org.apache.jasper.servlet.JspServlet.service(Unknown
Source)
        at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Unknown
Source)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(Unknown
Source)
        at org.apache.catalina.core.StandardWrapperValve.invoke(Unknown
Source)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(Unkno
wn Source)
        at org.apache.catalina.core.StandardPipeline.invoke(Unknown
Source)
        at org.apache.catalina.core.ContainerBase.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardContextValve.invoke(Unknown
Source)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(Unkno
wn Source)
        at org.apache.catalina.core.StandardPipeline.invoke(Unknown
Source)
        at org.apache.catalina.core.ContainerBase.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardContext.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardHostValve.invoke(Unknown
Source)

 
Can u please tell me what is wrong ?

Thanks,

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AW: Error found while connecting to mysql from JSP page deployedontomcat

Posted by "Power-Netz (Schwarz)" <sc...@power-netz.de>.
>
> Hi,
>
> I have installed tomcat on HP-UX box.I have deployed my web application
> on tomcat container.I have copied mysql JDBC driver under common/lib
> area.
>
> While running the application i am getting following error ....
>
> Cannot load JDBC driver class 'null'
> java.lang.NullPointerException:
>         at java.lang.Class.forName0(Native Method)
>         at java.lang.Class.forName(Unknown Source)


Your code is missing this :

try { Class.forName(drivername); } catch (Exception e) {
System.out.println("failed to load Driver:"+drivername); }

where drivername is "org.gjt.mm.mysql.Driver" OR the other mysqljdbc
package!



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