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Tomcat - PostgreSQL - Cannot load JDBC driver class "null" - Mailing list pgsql-jdbc

From CRAIG GOLBY
Subject Tomcat - PostgreSQL - Cannot load JDBC driver class "null"
Date
Msg-id C503D64777A56B4EBF0A50A6DCD976DD017317@DEVELOP001
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Responses Re: Tomcat - PostgreSQL - Cannot load JDBC driver class
Re: Tomcat - PostgreSQL - Cannot load JDBC driver class "null"
Re: Tomcat - PostgreSQL - Cannot load JDBC driver class "null"
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Help, I am tearing my hair out.
 
I am a newbie to Linux and Tomcat, and am therefore amazed that I have got as far as I have, that said I now seem to be stuck in front of a brick wall, with no ladder !!
 
Tomcat 4.1.24 is running on ServerOne (Red Hat 9), it is currently serving out a couple of very basic JSP's and seems to be working quite well. ServerOne also has J2SDK 1.4.1_03 installed.  PostgreSQL 7.3 is running on ServerTwo (Red Hat 9).  Have also installed pgAdminIII on both a Windows Laptop and ServerTwo.  The Laptop version works fine, if a little unstable, so TCP/IP connectivity is working fine.
 
Within PostgreSQL I have created a new Db called "PersonalDb", within the public Schema I have created a table called "testOne".  TestOne has three columns, Id, FieldOne and DateStamp, and there are currently 2 rows of data within the table
 
Sample of code used is below, along with a list of the Jar files in common/lib.
 
I have read through so many mailing lists now and tried so many things that I dont know what I have and havent done, am fairly sure that it is either a configuration issue or a missing file so will no doubt kick myself when I find out the answer.
 
Any assistance would be greatly appreciated.
 
Regards
 
 
Craig
 
 
*******************************************************
Server XML :- Tomcat/conf
*******************************************************
<Context path="/DBTest"
         docBase="DBTest"
         debug="5"
         reloadable="true"
         crossContext="true">
 
<Logger className="org.apache.catalina.logger.FileLogger"
        prefix="localhost_DBTest_log." suffix=".txt"
        timestamp="true"/>
 
<Resource name="jdbc/PersonalDb"
          type="javax.sql.DataSource"
          auth="Container"/>
 
<ResourceParams name="jdbc/PersonalDb">
 <parameter>
  <name>factory</name>
  <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
 </parameter>
 
 <parameter>
  <name>driverClassName</name>
  <value>org.postgresql.Driver</value>
 </parameter>
 
 <parameter>
  <name>url</name>
  <value>jdbc:postgresql://ServerTwo:5432/PersonalDb</value>
 </parameter>
 
 <parameter>
  <name>username</name>
  <value>myUser</value>
 </parameter>
 
 <parameter>
  <name>password</name>
  <value>myPassword</value>
 </parameter>
 
 <parameter>
  <name>maxActive</name>
  <value>10</value>
 </parameter>
 
 <parameter>
  <name>maxIdle</name>
  <value>30</value>
 </parameter>
 
 <parameter>
  <name>maxWait</name>
  <value>10000</value>
 </parameter>
 
</ResourceParams>
</Context>
 
</Host>
</Engine>
</Service>
 
 
*******************************************************
Web XML  :-  Tomcat/webapps/root/WEB-INF
*******************************************************
  <description>PostgreSQL Test App</description>
    <resource-ref>
       <description>postgreSQL Datasource example</description>
       <res-ref-name>jdbc/PersonalDb</res-ref-name>
       <res-type>javax.sql.DataSource</res-type>
       <res-auth>Container</res-auth>
   </resource-ref>
 
 
*******************************************************
My Class File
*******************************************************
 
  public void init() {
    try{
      Context ctx = new InitialContext();
      if(ctx == null )
          throw new Exception("Boom - No Context");
      status = "checking CTX";
 
      DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/PersonalDb");
      status = "Completing Lookup of CTX";
     
      if (ds != null)
        {
         status = "Creating Connection";
         Connection conn = ds.getConnection();   <----- FAILS HERE
         status = "Created Connection";
         if(conn != null) 
           {
            foo = "Got Connection "+conn.toString();
            Statement stmt = conn.createStatement();
            ResultSet rst =
                stmt.executeQuery(
                  "select Id, FieldOne, DateStamp from Public.testOne");
            status = "Completing Select";
            if(rst.next())
            {
               foo=rst.getString(2);
               bar=rst.getInt(3);
            }
            status = "Looped through Resultset";           
            conn.close();
           }
        }
      else {status = "Fell into Else";} 
    }catch(Exception e) {
      e.printStackTrace();
        status = status + ", now in exception block :-" + e.toString();
 
    }
 }
*******************************************************
Class Files in Tomcat/common/lib
*******************************************************
activation.jar
ant.jar
collections-2.1.jar
commons-collections.jar
commons-dbcp-1.0.jar
commons-dbcp.jar
commons-logging-api.jar
commons-pool.jar
jasper-compiler.jar
jasper-runtime.jar
jdbc2_0-stdext.jar
jndi.jar
jta.jar
mail.jar
naming-common.jar
naming-factory.jar
naming-resources.jar
pg73jdbc3.jar
pool-1.0.1.jar
postgresql.jar    (Copy of  pg73jdbc3.jar)
servlet.jar
 
 
 
 
 

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