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From "Vijaya" <svij...@solutionscraft.com>
Subject RE: Random NullPointerException when trying to connect to Datasource
Date Wed, 07 Jun 2006 12:23:31 GMT
Did you by chance miss any quotes while correcting the typo of the
displayed text?

Vijaya 

-----Original Message-----
From: brianvuyk@gmail.com [mailto:brianvuyk@gmail.com] On Behalf Of
Brian Vuyk
Sent: Wednesday, June 07, 2006 5:38 PM
To: users@tomcat.apache.org
Subject: Re: Random NullPointerException when trying to connect to
Datasource

Still wondering if anyone has any thoughts on this.

I appreciate any help.

Brian

On 6/6/06, Brian Vuyk <bvuyk@cs.redeemer.on.ca> wrote:
> I feel compelled to also mention that I have rebooted the system, with
> still the same effect.
>
> On 6/6/06, Brian Vuyk <bvuyk@cs.redeemer.on.ca> wrote:
> > Hello.
> >
> >
> > I am currently developing a JSP webapp for my employer, andhave run
> > into a couple of serious problems.
> >
> > Randomly, tomcat seems to be losing it's ability to connect to the
> > mySQL server running on the same server as Tomcat.
> >
> > Scenario:
> >
> > This morning I was using the webapp no problem. I made a small
change
> > to correct a typo in some displayed text, and then re-deployed the
> > webapp. Upon attempting to log into the webapp I was unable to
connect
> > to the database. I recieved the below error.
> >
> > Steps Taken:
> >
> > I have restarted both Tomcat and mySQL, with no change. I have
double
> > checked my source code, and I do not think the issue is with the
> > source itself. I have attempted re-deploying the webapp, including
an
> > archived, known good version. The result was the same exception
posted
> > above.
> >
> > I can log into the mySQL database from the command-line without any
> > issue at all.
> >
> > Thank you in advance for any help.
> >
> > Brian Vuyk
> >
> > Tomcat error taken from logs....
> >
----------------------------------------------------------------------
> > 2006-06-06 05:06:42 StandardWrapperValve[jsp]: Servlet.service() for
> > servlet jsp threw exception
> > javax.servlet.jsp.JspException: Unable to get connection, DataSource
> > invalid: "java.lang.NullPointerException"
> >         at
org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.getConnection
(QueryTagSupport.java:276)
> >         at
org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.doStartTag(Qu
eryTagSupport.java:159)
> >         at
org.apache.jsp.jsp.authenticate_jsp._jspx_meth_sql_query_0(authenticate_
jsp.java:286)
> >         at
org.apache.jsp.jsp.authenticate_jsp._jspService(authenticate_jsp.java:11
0)
> >         at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
> >         at
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> >         at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.ja
va:324)
> >         at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
> >         at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
> >         at
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> >         at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:237)
> >         at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:157)
> >         at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
e.java:214)
> >         at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:104)
> >         at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
20)
> >         at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardCon
textValve.java:198)
> >         at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
e.java:152)
> >         at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:104)
> >         at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
20)
> >         at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:137)
> >         at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:104)
> >         at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:117)
> >         at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:102)
> >         at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
20)
> >         at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
java:109)
> >         at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveCo
ntext.java:104)
> >         at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5
20)
> >         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:79
9)
> >         at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processC
onnection(Http11Protocol.java:705)
> >         at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:57
7)
> >         at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool
.java:683)
> >         at java.lang.Thread.run(Thread.java:595)
> >
------------------------------------------------------------------------
------------------------
> >
> >
> > Version Information:
> >
------------------------------------------------------------------------
-----------
> > Tomcat 5.5.17
> >
------------------------------------------------------------------------
-----------
> > mySQL:
> > mysql> status
> > --------------
> > mysql  Ver 14.7 Distrib 4.1.19, for pc-linux-gnu (i686) using
readline 5.1
> >
> > Connection id:          1
> > Current database:
> > Current user:           takedown@localhost
> > SSL:                    Not in use
> > Current pager:          /usr/bin/less
> > Using outfile:          ''
> > Using delimiter:        ;
> > Server version:         4.1.19-log
> > Protocol version:       10
> > Connection:             Localhost via UNIX socket
> > Server characterset:    utf8
> > Db     characterset:    utf8
> > Client characterset:    utf8
> > Conn.  characterset:    utf8
> > UNIX socket:            /var/run/mysqld/mysqld.sock
> > Uptime:                 2 hours 33 min 8 sec
> >
> > Threads: 1  Questions: 5  Slow queries: 0  Opens: 11  Flush tables:
1
> > Open tables: 5  Queries per second avg: 0.001
> > -------------------------------------------------------
> >
> > Here is my web.xml for this application:
> >
------------------------------------------------------------------------
-----------
> > <?xml version="1.0" encoding="UTF-8"?>
> > <web-app id="WebApp_ID" version="2.4"
> > xmlns="http://java.sun.com/xml/ns/j2ee"
> > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> > xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
> > http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
> >         <display-name>
> >         Takedown App</display-name>
> >         <welcome-file-list>
> >                 <welcome-file>index.jsp</welcome-file>
> >         </welcome-file-list>
> >
> >         <!-- Database connection info start -->
> >
> >         <context-param>
> >                 <param-name>
> >                         javax.servlet.jsp.jstl.sql.dataSource
> >                 </param-name>
> >                 <param-value>
> >
> >
jdbc:mysql://localhost:3306/takedowns,com.mysql.jdbc.Driver,takedown,pas
sword_removed
> >                 </param-value>
> >         </context-param>
> > </web-app>
> >
------------------------------------------------------------------------
-----------
> >
>

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