ojAlgo (v33) finally works
there was a native-java method call in
org.ojalgo.optimisation.integer.IntegerSolver.java:127 that is not
available in Dalvik. So ojalgo-33.0.jar was decompiled, edited and
recompiled.
The current ojAlgo version (v35) uses Java 1.7 which is only supported
since Android 4.4 and therefore not recommended.