The last few lines via strace:
DEBUG DefaultListableBeanFactory [main]: Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
[02-10 10:22:30] DEBUG AnnotationTransactionAttributeSource [main]: Adding transactional method [createUser] with attribute [PROPAGATION_REQUIRED,ISOLATION_DEFAULT]
) = ? ERESTARTSYS (To be restarted)
+++ killed by SIGSEGV +++
It could just be a JVM bug (not exactly sure which, but suggested by John Raymond Wold, W_work in #firstname.lastname@example.org) and upgrading to the newest version fixed the problem.