This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
1) weblogic.management.console.applets.Navapplet class comes with weblogic.jar. can you check whether your weblogic.jar file contains with that class or not. 2) Both of this can happen because of your machine environment is unable to run javaapplets. Configure your java runtime for that.