JDBC Driver cannot be loaded

Posted on 2004-09-19
Medium Priority
Last Modified: 2008-01-09
I am currently doing an application which includes using stateless session bean, i am using oracle jdeveloper 10g as my IDE, bea weblogic 6.1 as my app server and mysql for database.. i have this code tat connects to the database however when i test my client script, there is this exception

java.sql.SQLException: JDBC driver class cannot be loaded

      at Db.Database.<init>(Database.java:22)

      at Member.MemberEJBBean.addMember(MemberEJBBean.java:23)

      at Member.MemberEJBBean_fow6gt_EOImpl.addMember(MemberEJBBean_fow6gt_EOImpl.java:36)

      at Member.MemberEJBBean_fow6gt_EOImpl_WLSkel.invoke(Unknown Source)

      at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:360)

      at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java:93)

      at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:329)

      at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:22)

      at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:140)

      at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:121)

anyone know y? i have already included the jar file in the library of the IDE
Question by:ginola29
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Expert Comment

ID: 12099555
What's the code that creates the conenction? Do you call:

Author Comment

ID: 12099568
private final String driver = "com.mysql.jdbc.Driver";
private final String url = "jdbc:mysql://localhost/dvd";
private final String user = "";
private final String password = "";

 * The constructor attempts to load the jdbc driver class.
 * If failed, the ClassNotFoundException is rethrown as SQLException
public Database() throws SQLException {
      try {
      } catch (ClassNotFoundException ce) {
            throw (new SQLException("JDBC driver class cannot be loaded"));
 * Get a new connection.  User must close it after used.
public Connection getConnection() throws SQLException {
      return DriverManager.getConnection(url, user, password);

by the way, i am using mysql...i tik i have to setup a datasource at the weblogic console, but i just can't get it right, anyone can help me with that?
LVL 92

Expert Comment

ID: 12099586
Its not finding your driver class, make sure the jar is available to the WL class loader.
eg. put the jar in <webapp>/WEB-INF/lib
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Author Comment

ID: 12099600
erm..my project doesn't have a web-inf folder, must i just create that folder? just under the folder <webapp>
LVL 92

Expert Comment

ID: 12099614
yes where <webapp> is the folder that you webapplication is in.

Author Comment

ID: 12099667
i still got the same error, driver cannot be loaded, must i do some configuration between weblogic server and mysql? can i know hw to if it is a must?
LVL 92

Accepted Solution

objects earned 500 total points
ID: 12099694

Author Comment

ID: 12099737
there are some errors i have encounter

i entered:
name : dvdProject
url: jdbc:mysql://localhost/dvd
driver classname: com.mysql.jdbc.Driver
properties: user=root

the rest all blanks

then i went to the target tab, and tried to deploy it, errors are returned.

weblogic.management.DistributedOperationUpdateException: Error creating connection pool - with nested exception:
[weblogic.management.DeploymentException: Error creating connection pool - with nested exception:
[weblogic.common.ResourceException: Cannot load driver class: com.mysql.jdbc.Driver]]
      at weblogic.management.internal.ConfigurationMBeanImpl.updateConfigMBeans(ConfigurationMBeanImpl.java:518)
      at weblogic.management.internal.ConfigurationMBeanImpl.invoke(ConfigurationMBeanImpl.java:376)
      at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1557)
      at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1525)
      at weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:468)
      at weblogic.management.in--------------- nested within: ------------------
weblogic.management.console.utils.SetException: An error occurred while updating Targets-Server on Proxy for mydomain:Name=dvdProject,Type=JDBCConnectionPool - with nested exception:
[java.lang.reflect.InvocationTargetException - with target exception:
[weblogic.management.DistributedManagementException: Distributed Management [1 exceptions]]]
      at weblogic.management.console.actions.mbean.DoEditMBeanAction.perform(DoEditMBeanAction.java:155)
      at weblogic.management.console.actions.internal.ActionServlet.doAction(ActionServlet.java:171)
      at weblogic.management.console.actions.internal.ActionServlet.doPost(ActionServlet.java:85)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
      at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:262)
      at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:198)
      at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:2678)
      at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2412)
      at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:140)
      at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:121)
LVL 92

Expert Comment

ID: 12099764
still looks like its not finding your driver class
chechk the jar contains the specified class

Author Comment

ID: 12099816
ok i got it solve, the classpath wasnt' set correctly at the right place in the startweblogic.cmd .. thx anyway

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