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04.27.2006 at 11:31PM PDT, ID: 21830805
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4.6

Tomcat 5x connection Pooling

Asked by riteinfotech in Java Programming Language, Java Servlets

Tags:

i m trying to implement connection pooling in my application the configuration description is

my apploication web.xml
<resource-ref>
  <description>Oracle Datasource example</description>
  <res-ref-name>oracle</res-ref-name>
  <res-type>javax.sql.DataSource</res-type>
  <res-auth>Container</res-auth>
</resource-ref>

entry in
C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\balancer\META-INF\context.xml

<Context privileged="true" antiResourceLocking="false" antiJARLocking="false">
<Resource
name="oracle"
auth="Container"
type="javax.sql.DataSource"
factory="org.apache.commons.dbcp.BasicDataSourceFactory"
username="devdbms"
password="devdbms"
driverClassName="oracle.jdbc.driver.OracleDriver"
url="jdbc:oracle:thin:@192.168.0.116:1521:orcl"
removeAbandoned="true"
removeAbandonedTimeout="60"
logAbandoned="true"
/>
</Context>


jar files in C:\Program Files\Apache Software Foundation\Tomcat 5.5\common\lib

classes12.jar, classes12dms.jar, commons-collections-2.1.1.jar, commons-dbcp-1.2.1.jar, commons-pool-1.3.jar


java code to get connections

 try{
              Context initContext = new InitialContext();
              Context envContext  = (Context)initContext.lookup("java:/comp/env");
              DataSource ds = (DataSource)envContext.lookup("oracle");
              Connection conn = ds.getConnection();
              }catch(Exception exception ){
                    exception.printStackTrace();
              }

getting the error


org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
      at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:780)
      at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
      at com.bhel.listener.BHELApplicationListener.contextInitialized(BHELApplicationListener.java:42)
      at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3669)
      at org.apache.catalina.core.StandardContext.start(StandardContext.java:4104)
      at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
      at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
      at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
      at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
      at org.apache.catalina.core.StandardService.start(StandardService.java:450)
      at org.apache.catalina.core.StandardServer.start(StandardServer.java:683)
      at org.apache.catalina.startup.Catalina.start(Catalina.java:537)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271)
      at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)
Caused by: java.lang.NullPointerException
      at oracle.jdbc.driver.OracleDriver.oracleAcceptsURL(OracleDriver.java:550)
      at oracle.jdbc.driver.OracleDriver.acceptsURL(OracleDriver.java:598)
      at java.sql.DriverManager.getDriver(Unknown Source)
      at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:773)
      ... 17 more


can some one tell me where is the problem
please help
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Zones: Java Programming Language, Java Servlets
Tags: tomcat
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Solution Provided By: fargo
Participating Experts: 3
Solution Grade: A
 
 
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