ava.lang.LinkageError: loader constraints violated when link

[fonta]

Hi all,
I'm trying to configure MySQL 3.23.38 on JBoss 3.0.4 but I catched the error reported i ìn subject.
Below the steps I followed:

1. I Inserted mysql-service.xml file in
<JBOSS_HOME>/server/default/deploy directory
setting the connection to DB:
.....
<config-property name="ConnectionURL" type="java.lang.String">jdbc:mysql://localhost:3306/jbossdb</config-property>
<config-property name="DriverClass" type="java.lang.String">com.mysql.jdbc.Driver</config-property>

....

2. I put mySQL driver under <JBOSS_HOME>/server/default/lib directory

3. I Updated standardjbosscmp-jdbc.xml file like this:
...
java:/MySqlDS
<datasource-mapping>mySQL....

I' ve searched over Internet a similar Error but I have not found nothing that could helps me.

Could you tell me any suggests about that?

Thanks,

Andrea

[davidjencks]

Usually linkage errors are caused by having more than one copy of a class loaded. Look at what mysql provides with their driver, and make sure you haven't deployed anything else with this class.

[andrea.fontanelli]

Many thanks David,
I had loaded the jdbc driver twice.
Now it works correctly.
Ciao,
Andrea


P.S. I changed my nick.