bad class file. class file has wrong version 50.0, should be 4x.0.

When compiling your code using the JAR files, you may receive an error similar to the one below:

packages/apps/DMClient/src/com/asus/dm/DMMMIFactory.java:3: cannot access com.redbend.vdm.MmiChoiceList

bad class file: out/target/common/obj/JAVA_LIBRARIES/XXXX_intermediates/javalib.jar(com/XXXX/vdm/MmiChoiceList.class)

class file has wrong version 50.0, should be 49.0

Please remove or make sure it appears in the correct subdirectory of the classpath.

import com.XXXX.vdm.MmiChoiceList;
^
1 error

These types of errors are caused by a Java version mismatch between the compiled proxies and your runtime.

Below are a list of some of the version numbers and their corresponding Java runtimes:

Version 50.0 = Java 1.6.x
Version 49.0 = Java 1.5.x
Version 48.0 = Java 1.4.x

To resolve this issue, compile them with the right version of Java SDK