Problem: You were able to generate a proxy for a particular class, but now when you use the proxy when running the application, you get a ClassNotFoundException that says it cannot find the Java class.

JNBProxy was able to find the Java class and generate the proxy because the classpath was correct at the time the proxy was generated. However, now that the proxies are being used, your Java-side's classpath is missing the class your proxy is looking for. Review the classpath, add any missing folders or JAR files, and restart the Java-side.