Hi,
I would like to use the Tomcat JDBC Connection Pool with a shared resource so
I've read :
http://tomcat.apache.org/tomcat-7.0-doc/jdbc-pool.html#Standalone and
http://tomcat.apache.org/tomcat-7.0-doc/config/context.html#Resource_Links
.... and tried to do the same but when I try to access to my servlet I get the
following message:
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of
class '' for connect URL 'null'
at
org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1452)
at
org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)
at
org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at testPackage.DBTest.doGet(DBTest.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:612)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at
sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:524)
at
sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:493)
at
sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307)
at java.sql.DriverManager.getDriver(DriverManager.java:262)
at
org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1437)
... 25 more
--------------------
Environment :
Win 7
Java - jdk 1.7.0.65
Tomcat - 7.0.57
MySQL - 5.1.18
--------------------
Tomcat service properties:
-Dcatalina.home=Y:\Programs\Tomcat\Tomcat7
-Dcatalina.base=Y:\00-Prod\data\catalina
-Djava.endorsed.dirs=Y:\Programs\Tomcat\Tomcat7\endorsed
-Djava.io.tmpdir=Y:\Programs\Tomcat\Tomcat7\temp
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.util.logging.config.file=Y:\Programs\Tomcat\Tomcat7\conf\logging.properties
-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=8099
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false
-XX:MaxPermSize=512m
--------------------
CATALINA_HOME/lib contents
...
tomcat-dbcp.jar
tomcat-jdbc.jar
...
--------------------
CATALINA_BASE/lib contents:
mysql-connector-java-5.1.18-bin.jar
--------------------
CATALINA_BASE/conf/server.xml
...
...
<GlobalNamingResources>
...
-->
<Resource name="sharedDataSource"
global="sharedDataSource"
auth="Container"
type="javax.sql.DataSource"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
driverClassName="com.mysql.jdbc.Driver"
initialSize="2" minIdle="4"
maxActive="8" maxIdle="4" maxWait="10000"
username="javauser"
password="javadude"
url="jdbc:mysql://localhost:3306/javatest"/>
</GlobalNamingResources>
...
...
--------------------
CATALINA_BASE/conf/Catalina/localhost/test-app.xml
<?xml version='1.0' encoding='utf-8'?>
<Context path="/test-app" privileged="true">
...
...
<!-- url: The JDBC connection url for connecting to your MySQL database. -->
<ResourceLink name="jdbc/LocalTestDB"
global="sharedDataSource"
type="javax.sql.DataSource"/>
...
...
</Context>
--------------------
DBTest.java excerpt :
package testPackage;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
....
@WebServlet(name="DBTest", urlPatterns="/DatabaseTest")
public class DBTest extends HttpServlet {
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
PrintWriter out = response.getWriter();
DataSource ds;
Connection con;
con = null;
String title = "Database Result";
...
...
try {
Context ctx = new
InitialContext();
Context initContext = (Context)
ctx.lookup("java:/comp/env");
ds = (DataSource)
initContext.lookup("jdbc/TestDB");
<!-- line 62 --> con = ds.getConnection();
...
...
--------------------
Note that when I don't share the datasource (Resource element is in
test-app.xml and no ResourceLink in server.xml), it works fine.
Any ideas on where should I look at ?
Best Regards
Jean-Louis Matéo
