Thank you.
I can tell this is an error related to Tomcat/JNDI set-up, as I can make
a JDBC connection, as the codes state below.
Class.forName("org.postgresql.Driver");
String url = "jdbc:postgresql:testdb";
Properties props = new Properties();
props.setProperty("user","username");
props.setProperty("password","password");
conn = DriverManager.getConnection(url, props);
I change the following url setting
url="jdbc:postgresql://127.0.0.1:5432/testdb"
to
url="jdbc:postgresql:testdb"
and I have the same error.
I remove the META-INF/context.xml, and modify the <Host> node of tge
server.xml as shown below:
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
<Context path="/someApp" docBase="someApp" debug="0"
reloadable="true">
<Resource
name="jdbc/postgres"
type="javax.sql.DataSource"
password="linux4draco"
driverClassName="org.postgresql.Driver"
maxIdle="2"
maxWait="5000"
validationQuery="SELECT 1"
username="gepguser"
url="jdbc:postgresql://localhost/testdb"
maxActive="4"/>
</Context>
</Host>
And, I have the same error.
What else could I try?
Stanley
-----Original Message-----
From: David Smith [mailto:d...@cornell.edu]
Sent: Tuesday, March 03, 2009 12:44 PM
To: Tomcat Users List
Subject: Re: FW: Cannot create JDBC driver of class '' for connect URL
'null'
Stanley Wong wrote:
> Hi,
>
> I encounter a problem regarding setting up a JNDI Datasource at Tomcat
> 6.0 with PostgreSQL 8.1 under Linux Suse 10.3 environment. This is the
> exception:
>
> org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC
> driver of class '' for connect URL 'null'
>
> I wonder if there are some additional settings that I may have
> forgotten.
>
> Would you give me a hand here?
>
> Stanley
>
>
>
> Here is what I do:
>
> 0) Ensure the postgreSQL.jar is stored inside the tomcat/lib
>
> 1) Create a context.xml in the META-INF. The context.xml defines the
> context below:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <Context path="/someApp" docBase="someApp"
> crossContext="true" reloadable="true" debug="1">
>
> <Resource name="jdbc/postgres" auth="Container"
> type="javax.sql.DataSource"
> driverClassName="org.postgresql.Driver"
> url="jdbc:postgresql://127.0.0.1:5432/testdb"
> username="gepguser" password="password" maxActive="20"
> maxIdle="10"
> maxWait="-1"/>
> </Context>
>
> Where testdb is the database inside PostgreSQL.
>
> 2) Add the following entry in web.xml:
>
> <resource-ref>
> <description>postgreSQL Datasource example</description>
> <res-ref-name>jdbc/postgres</res-ref-name>
> <res-type>javax.sql.DataSource</res-type>
> <res-auth>Container</res-auth>
> </resource-ref>
>
> 3) Use the following code to get the connection:
>
> public Connection getConnection() {
> Connection conn = null;
> Context initCtx;
> try {
> initCtx = new InitialContext();
> DataSource ds = (DataSource) initCtx
>
> .lookup("java:comp/env/jdbc/postgres");
>
> conn = ds.getConnection();
> } catch (NamingException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> } catch (SQLException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
> return conn;
> }
>
>
>
>
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>
>
We just had a thread regarding this. Can you describe what you have
done so far to diagnose it?
--David
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