After updating to Java 2.0.0, I've encountered https://stackoverflow.com/questions/58120357/jeromq-on-android-no-virtual-method-clearljava-nio-bytebuffer on Android. The fix is simple: replace all bb.position() calls with ((Buffer) bb).position(). Unfortunately, I don't see a client-side workaround.