I'm using the Java suggested as the (successful) solution to this problem:
Finding libraries that need to be dexed. (0.00s)
Dex code Error
Error in C:\Users\David\Documents\B4A\Projects\Tester\B4A\Objects\bin\classes\b4a\example\main$B4AMenuItemsClickListener.class:
java.lang.NullPointerException: Cannot invoke "String.length()" because "<parameter1>" is null
Compilation failed with an internal error.