jdkIf you get that error when invoking the Oracle-Forms Layout-Editor and you are sure the naming of the bean and also the FORMSxx_BUILDER_CLASSPATH variable is set correctly, then you should check with which java-version your bean is compiled. To display it correctly in version 10.x you need JDK 1.4.2_06 or lower. I don't know which version you need for version 11, please comment if you have any infos about that.