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From Mighty Tornado <mighty.torn...@gmail.com>
Subject javax.naming.NamingException: Cannot create resource instance
Date Mon, 06 Apr 2009 16:02:26 GMT
JVM: 1.5.0_16Tomcat: 6.0.16 2
OS: Mac OS X Leopard

Hi,

I defined the following context.xml under META-INF:

<?xml version="1.0" encoding="UTF-8"?>

<Context path="/Household" docBase="Household" debug="5" reloadable="true"
crossContext="true">

<Resource

    auth="Container"

    description="DB Connection"

    name="jdbc/vhousehold"

    type="javax.sql.DataSource"

    password="vhousehold"

    driverClassName="com.mysql.jdbc.Driver"

    maxIdle="2"

    maxWait="5000"

    validationQuery="/* PING */ SELECT 1;"

    username="vhousehold"

    url="jdbc:mysql://localhost:3306/vhousehold"

    maxActive="4"/>

</Context>


In web.xml I have the following:


  <resource-ref>

        <description>Connection Pool</description>

        <res-ref-name>jdbc/vhousehold</res-ref-name>

        <res-type>javax.sql.Datasource</res-type>

        <res-auth>Container</res-auth>

  </resource-ref>


I try to get this data source in my application using the following code:


DataSource ds = (DataSource)initContext.lookup(
"java:/comp/env/jdbc/vhousehold");


and it fails. This is the exception I get:

javax.naming.NamingException: Cannot create resource instance

        at
org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:143)

        at
javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)

        at org.apache.naming.NamingContext.lookup(NamingContext.java:793)

        at org.apache.naming.NamingContext.lookup(NamingContext.java:140)

        at org.apache.naming.NamingContext.lookup(NamingContext.java:781)

        at org.apache.naming.NamingContext.lookup(NamingContext.java:140)

        at org.apache.naming.NamingContext.lookup(NamingContext.java:781)

        at org.apache.naming.NamingContext.lookup(NamingContext.java:153)

        at
org.apache.naming.SelectorContext.lookup(SelectorContext.java:137)

        at javax.naming.InitialContext.lookup(InitialContext.java:351)

        at
com.vhousehold.dao.RandomPhraseDAO.getPhrases(RandomPhraseDAO.java:60)

        at
com.vhousehold.model.RandomPhraseModel.getRandomPhrase(RandomPhraseModel.java:19)

        at com.vhousehold.servlet.VHController.doPost(VHController.java:52)

        at com.vhousehold.servlet.VHController.doGet(VHController.java:35)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)

        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)

        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)

        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)

        at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)

        at java.lang.Thread.run(Thread.java:613)


Any suggestions as to what I am doing wrong?


Thanks.

Mime
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