Treffer: 2 Automated Detection of Non-Termination and NullPointerExceptions for Java Bytecode ⋆

Recently, we developed an approach for automated termination proofs of Java Bytecode (JBC), which is based on constructing and analyzing termination graphs. These graphs represent all possible program executions in afiniteway. Inthis paper, we showthat this approach can also be used to detect non-termination or NullPointerExceptions. Ourapproach automatically generates witnesses, i.e., calling theprogram with these witness arguments indeed leads to non-termination resp. to a NullPointerException. Thus, we never obtain “false positives”. We implemented our results in the termination prover AProVE and provide experimental evidence for the power of our approach. 1