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NoClassDefFoundError for driver in db2java.zip

Anne Forumer
Ranch Hand

Joined: Apr 19, 2004
Posts: 72
Windows 2000, WAS Express 5.0.2, WSAD5.1

I have deployed my first application with some servlets in WAS5.0.2 as an ear with only a web-module in it. jars and zips that this application uses are under WEB-INF/lib directory. This lib also has db2java.zip that the seemingly missing class is in! I am stumped why lib directory is not being looked up! I printed "java.class.path" in a SnoopServlet and was surprised to find that none of the jars under WEB-INF/lib are listed! A section of error-trace is included below.

I'll appreciate any help.


java.lang.NoClassDefFoundError: COM/ibm/db2/jdbc/app/DB2Driver
at java.lang.Class.forName1(Native Method)
at java.lang.Class.forName(Class.java(Compiled Code))
at com.company.database.DatabaseConnectionPool.makeNewConnection(DatabaseConnectionPool.java:686)


Thanks
emm raha
Ranch Hand

Joined: Mar 18, 2003
Posts: 57
Double check Properties --> Java Build Path --> Libraries that the jars/zips in /lib are listed. If they are and its still failing, try dropping db2jcc.jar (newer DB2 driver) in there too.
Anne Forumer
Ranch Hand

Joined: Apr 19, 2004
Posts: 72
Thanks for your reply.

But that won't help because our application is looking for COM/ibm/db2/jdbc/app/DB2Driver and db2jcc.jar has com/ibm/db2/jcc/DB2Driver!

Any comments?

Do you know if "zip" in db2java.zip, instead of "jar" could be causing problems? I have seen some mention of it in other postings.

What else could I do to test?

Thanks
emm raha
Ranch Hand

Joined: Mar 18, 2003
Posts: 57
Can't really think of what the issue could be - zip/jar shouldn't matter. How have you created the datasource on your server instance? I did the following which worked for me:
(1) JDBC Provider - DB2 Universal JDBC Driver Provider
(2) make sure the DB2UNIVERSAL_JDBC_DRIVER_PATH is set
(3) drop db2jcc.jar into the project's lib folder, for some reason it can't see it if its elsewhere

HTH.
Anne Forumer
Ranch Hand

Joined: Apr 19, 2004
Posts: 72
I am not using a datasource created in AppServer. I am porting a working application from WAS3.5. The application has it's own datasource and connection-pooling.

By the way, do you know if there is a faster way to "export" an application to ear in WSAD5.1. When I export it seems to rebuild the application from scratch, which takes a long time.

Thanks for your help.
emm raha
Ranch Hand

Joined: Mar 18, 2003
Posts: 57
I'm all out of suggestions - last resort you could create the datasources on the server instance and edit your code to do JNDI lookups for the datasources.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: NoClassDefFoundError for driver in db2java.zip