The mysteries of JDBC, JNDI, and Tomcat 5.5.4

Like thousands beforefore, I can't get connection pooling to work in Tomcat. I followed all the steps:
- put jar file for MySQL JDBC driver in TOMCAT_HOME/common/lib
- put the Jakarta Commons libs in the same location
- put resource declaration in META-INF/context.xml, per the Tomcat 5.5 docs like so:
<Context docbase="C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\commutercorps"
    path="\commutercorps" >
    <Resource name="jdbc/commutercorpsds"
        auth="Container"
        type="javax.sql.DataSource"
        maxActive="100"
        maxIdle="30"
        maxWait="10000"
        username="myusername"
        password="mypassword"
        driverClassName="com.mysql.jdbc.Driver"
        url="jdbc:mysql://localhost:3306/commuter_corps_signup"/>
</Context>- added resource ref in web.xml
    <resource-ref>
        <description>DB Connection</description>
        <res-ref-name>jdbc/commutercorpsds</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>I also double checked my connection URL and found that it does work fine when do this in my Java code:
Class.forName("com.mysql.jdbc.Driver");
Connection con =
    DriverManager.getConnection
    ("jdbc:mysql://localhost:3306/commuter_corps_signup", "...", "...");When I try to use Tomcat 5.5.4, JNDI like this...
                try
                    InitialContext initialContext = new InitialContext();
                    DataSource dataSource =
                            (DataSource) initialContext.lookup
                            ("java:comp/env/jdbc/commutercorpsds");
                    Connection con = dataSource.getConnection();
                    Statement stmt = con.createStatement();
                    stmt.executeUpdate(SQLMaker.getInsert(request,
                            request.getParameter("table")));
                    con.close();
                    stmt.close();
                } catch (NamingException e)
                    System.out.println(e.getMessage());
                    e.printStackTrace();
                }...I get...
Cannot create JDBC driver of class '' for connect URL 'null'
Caused by: java.sql.SQLException: No suitable driver
Any help would be greatly appreciated.
Thanks,
E

I used to get the message
Cannot create JDBC driver of class '' for
connect URL 'null'
No suitable driverError.
I was running, jakarta-tomcat-5.0.14.exe on windows.
I had it installed on a path without spaces
d:\tomcat5\Good.
I wanted to use Hibernate. So i used, extensiontools.What's that?
First create a env var: HIBERNATE_HOME pointing to
the hibernate extracted dir.No need for this.
Modify setenv.bat to correct %CP% for
commons-logging, commons-collection and anything
else: the version string at the end of the jar
changes.Wrong. You shouldn't be doing this.
Then run ddl2hbm, straightforward, fill info in all
tabs and hit generate. Will show some error message,
but still creates xmls.I don't see what any of this has to do with Tomcat deployment.
Then run hbm2java, and hand over each xml file as
parameter. Creates some java files in generated dir.
Modify the toString method to something simpler and
remove the import for apache class.All great, but still has nothing to do with Tomcat deployment.
move them over to webapp classes.You should create a WAR file or a separate context directory for your application under /webapps. If you're doing anything else, it's wrong.
Create JNDI in sever.xml as mentioned.Nope. Shouldn't be editing server.xml. Put that stuff in an application-specific context.xml, which goes in the META-INF of your WAR file.
Create reference in web.xml as mentioned.Good.
Goto conf/catalina/localhost/<webappname>.xmlNo need for this. Don't know what you're doing here.
add the line
<ResourceLink name="jdbc/Oracle"
type="javax.sql.DataSource" global="jdbc/Oracle"/>
replace Oracle with your datasource name.
and i got me workingMight be working, but it's not really correct.
%

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         at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
         at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
         at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
         at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
         at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2388)
         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
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  • JNLP and Tomcat JNDI DataSource

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  • Problem with JDBC and Tomcat

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    My program is a Servlet, but for the purpose of debugging, I have recode it to an Application/Servlet. When run as a application, I can get the result expected, but as a Servlet, :-(, maybe you should see it by yourself. My server software is Tomcat 4.1.15, and the JDK version is 1.4.0. To excute this program, you should add Data Source "Test" to ODBC.
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  • Java and Tomcat: Why do I need the port number when accessing Tomcat?

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  • Problem using JDBC (JNDI) DataSource and data-sources.xml w/ OC4J

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    If I try to run the main form, simply nothing happens.
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  • Error while retriving the connection uisng JNDI and DATASOURCE

    hi guys,
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    password="abc"
    url="jdbc:oracle:thin:@BC354321:1521:CRADV1"
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    Here is the program i had written to retrive the datasource
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    import javax.naming.InitialContext;
    import java.sql.*;
    import javax.naming.Context;
    import javax.sql.DataSource;
    public class Main {
    public Main() {
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    try {
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    System.out.println("##########context********"+context);
    DataSource ds = (DataSource)context.lookup("jdbc/OracleDS_native");
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    con = ds.getConnection();
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    catch(SQLException e)
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    at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:640)
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    at javax.naming.InitialContext.lookup(InitialContext.java:347)
    at javaapplication1.Main.main(Main.java:35)
    what might be the problem??
    regards
    Phani

    Phani,
    From the contents of your "data-sources.xml" file that you posted, it looks like you are using a pre-10.1.3.x version of OC4J (stand-alone?), so Jason's link may not be helpful.
    Nonetheless, as Jason mentions, you do need to set some properties that need to be passed to the "InitialContext" class constructor. Probably something like the following.
    [Note that the code is uncompiled and untested.]
    Properties prp = new Properties();
    prp.put(Context.INITIAL_CONTEXT_FACTORY,
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    prp.put(Context.PROVIDER_URL, "ormi://oc4j_host");
    prp.put(Context.SECURITY_PRINCIPAL, "user");
    prp.put(Context.SECURITY_CREDENTIALS, "password");
    Context ctx = new InitialContext(prp);
    DataSource ds = (DataSource) context.lookup("jdbc/OracleDS_native");And replace "oc4j_host" with the name of your OC4J host machine as well as "user" and "password" with the appropriate values.
    Note that you can probably use the OC4J admin user's details.
    Good Luck,
    Avi.

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