-JPKG = org/sigrok/core/classes
-JINT = $(JDIR)/$(JPKG)/classes.i
-JSRC = $(JDIR)/$(JPKG)/classes_wrap.cxx
+JPKG = org/sigrok/core
+JCLS = $(JDIR)/$(JPKG)/classes
+JINT = $(JDIR)/$(JPKG)/interfaces
+JSRC = $(JCLS)/*.java $(JINT)/*.java
+JSWG = $(JCLS)/classes.i
+JCXX = $(JCLS)/classes_wrap.cxx