Hi!

I'm making a web application with j2ee, tomcat (5.0), struts, mysql (mysql-connector-java-3.1.10-bin.jar y jdbc2_0-stdext.jar) and hibernate(3.1 rc3).
But I have this error:

java.lang.UnsupportedClassVersionError: com/mysql/jdbc/Connection (Unsupported major.minor version 8238.8224)
java.lang.ClassLoader.defineClass0(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:502)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1653)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:883)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1333)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1213)
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:264)
java.sql.DriverManager.getConnection(DriverManager.java:512)
java.sql.DriverManager.getConnection(DriverManager.java:140)
org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110)
org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:72)
org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1823)
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1143)
pxai.struts.kaixo.action.HibernateManager.(HibernateManager.java:17)
pxai.struts.kaixo.action.Autentificacion.execute(Autentificacion.java:29)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

Does anyone know what is this error about and how can I make it work?

Tanks,

Luciana[/img]

Luciana

It could be a couple of things,
But posibliy you are using diferent versions of the same object. Or, in others words, you have deployed diferent versions of the same jar within your ears or wars.

Emilio

Emilio,

Thank you very much for your help, I look at all my jars and I just have one Connection.class, but I can solve the problem including again the mysql-connector-java-3.1.10-bin.jar in my lib and it works.

Luciana