Java.lang.NoClassDefFoundError when executing JAVA code

Question

Hy everyone,
Trying to execute some java code through forms I got this error when running my program : java.lang.NoClassDefFoundError : simple (where simple is a java class I developped).
These are the steps I followed:
1- Devopping a simple JAVA class (simple.java) and compiling in JDK 1.4 (for compatibilty with forms 10.1.2.0.2)
2- Creating the JAR file
3- Copying the JAR file in <ORACLE_HOME>\forms\java
4- Adding the adress of the JAR file in CLASSPATH (environment variable of the server)
5- Adding the adress of the JAR file in CLASSPATH (environmental file of OAS default.env)
6- Importing the JAVA class trought forms builder (program>>import java class)
7- Invoking the JAVA class via the PL/SQL packages created by forms builder
8- Running the program
Thanks for your help.
Regards.

Answer 1

In most cases, you should not have to stop and restart OC4J_BI_FORMS to pick such changes. However, since you are having problems, I would ensure that all frmweb processes have been stopped, then stop and restart OC4J_BI_FORMS and retest. If that doesn't work, you should review how you imported the java into your app. Look closely at the Importer options you used and ensure that you have not change the file name at any point. Because you are working with Java, case sensitivity is critical.
Also, where are you seeing the error message? Client java console or in a server side log? If server side, exactly which log file is reporting the problem? I would suggest you post the first 4 ro 5 lines of the error and not just the NoClassDefFound part.