Getting HTTP 500 Internal Server Error in JDeveloper 10g Release 3

Question

Hello,
I had run a web page of JSF a month ago with no issues from the server. Now however whnever I try running any page from the IDE, I keep getting following message in the log:
[i]Mar 1, 2008 10:06:25 AM com.evermind.server.ApplicationStateRunning initConnector
SEVERE: Stack trace: oracle.oc4j.sql.DataSourceException: Exception creating connection pool. Exception: oracle.oc4j.sql.config.DataSourceConfigException: Unable to create : com.mysql.jdbc.Driver
     at com.evermind.server.ApplicationStateRunning.initDataSourceConnectionPool(ApplicationStateRunning.java:2016)
     at com.evermind.server.ApplicationStateRunning.initDataSourceConnector(ApplicationStateRunning.java:1961)
     at com.evermind.server.ApplicationStateRunning.initConnector(ApplicationStateRunning.java:1220)
     at com.evermind.server.ApplicationStateRunning.initConnectors(ApplicationStateRunning.java:356)
     at com.evermind.server.ApplicationStateRunning.initializeApplication(ApplicationStateRunning.java:208)
     at com.evermind.server.Application.setConfig(Application.java:391)
     at com.evermind.server.Application.setConfig(Application.java:309)
     at com.evermind.server.ApplicationServer.addApplication(ApplicationServer.java:1771)
     at com.evermind.server.ApplicationServer.initializeDeployedApplications(ApplicationServer.java:1532)
     at com.evermind.server.ApplicationServer.setConfig(ApplicationServer.java:939)
     at com.evermind.server.OC4JRestarter.run(OC4JRestarter.java:35)
     at java.lang.Thread.run(Thread.java:595)
Caused by: javax.resource.ResourceException: oracle.oc4j.sql.config.DataSourceConfigException: Unable to create : com.mysql.jdbc.Driver
     at oracle.oc4j.sql.spi.ResourceAdapterImpl.createDataSourceConnectionPool(ResourceAdapterImpl.java:106)
     at oracle.oc4j.sql.DataSourceUtils.getDataSourceConnectionPool(DataSourceUtils.java:322)
     at com.evermind.server.ApplicationStateRunning.initDataSourceConnectionPool(ApplicationStateRunning.java:1997)
     ... 11 more
Caused by: oracle.oc4j.sql.config.DataSourceConfigException: Unable to create : com.mysql.jdbc.Driver
     at oracle.oc4j.sql.config.DataSourceConfigUtils.createConnectionFactory(DataSourceConfigUtils.java:247)
     at oracle.oc4j.sql.DataSourceConnectionPoolImpl.<init>(DataSourceConnectionPoolImpl.java:107)
     at oracle.oc4j.sql.spi.ResourceAdapterImpl.createDataSourceConnectionPool(ResourceAdapterImpl.java:99)
     ... 13 more
Caused by: oracle.classloader.util.AnnotatedClassNotFoundException:
     Missing class: com.mysql.jdbc.Driver
     Dependent class: oracle.oc4j.sql.config.DataSourceConfigUtils
     Loader: oc4j:10.1.3
     Code-Source: /C:/Program Files/j2ee/home/lib/oc4j-internal.jar
     Configuration: <code-source> in META-INF/boot.xml in C:\Program Files\j2ee\home\oc4j.jar
This load was initiated at current-workspace-app.root:0.0.0 using the Class.forName() method.
The missing class is not available from any code-source or loader in the system.
     at oracle.classloader.PolicyClassLoader.handleClassNotFound(PolicyClassLoader.java:2061)
     at oracle.classloader.PolicyClassLoader.internalLoadClass(PolicyClassLoader.java:1665)
     at oracle.classloader.PolicyClassLoader.loadClass(PolicyClassLoader.java:1621)
     at oracle.classloader.PolicyClassLoader.loadClass(PolicyClassLoader.java:1606)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:242)
     at oracle.oc4j.sql.config.DataSourceConfigUtils.createConnectionFactory(DataSourceConfigUtils.java:244)
     ... 15 more
08/03/01 10:06:25 WARNING: Application.setConfig Application: current-workspace-app is in failed state as initialization failedjava.lang.InstantiationException: Error occurred initializing connectors. Exception is: Exception creating connection pool. Exception: oracle.oc4j.sql.config.DataSourceConfigException: Unable to create : com.mysql.jdbc.Driver
Mar 1, 2008 10:06:25 AM com.evermind.server.Application setConfig
WARNING: Application: current-workspace-app is in failed state as initialization failedjava.lang.InstantiationException: Error occurred initializing connectors. Exception is: Exception creating connection pool. Exception: oracle.oc4j.sql.config.DataSourceConfigException: Unable to create : com.mysql.jdbc.Driver
2008-03-01 10:06:25.109 WARNING J2EE 0JR0013 Exception initializing deployed application: current-workspace-app. Error occurred initializing connectors. Exception is: Exception creating connection pool. Exception: oracle.oc4j.sql.config.DataSourceConfigException: Unable to create : com.mysql.jdbc.Driver
Ready message received from Oc4jNotifier.
Embedded OC4J startup time: 22578 ms.
Target URL -- http://192.168.1.2:8989/AVTproject-ViewController-context-root/faces/HomeLogin.jspx
[Another instance of the server is still running.  JDeveloper will shut it down and then restart the server.]
Process exited.
**** Server startup cancelled by the user.
I finally deleted the MYSQL Database connection to the application. Still it doesnt work. Please help me as I really cant track why this is so.

Answer 1

Hello,
Thank You very much for the solution. I had uninstalled the previous JDeveloper 10g installation and installed a new instance of the same. After which it worked without much of a problem.
However, my application requires to use MySQL database, so how do I tackle such an error. What was wrong with the connection? I mean MySQL instance seemed to work fine. Is there any version with which JDeveloper can work? Right now am using MySQL 5.0.? Please do advise.