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//Exception x = ...; LOG.warning("encountered a problem: " + x); => LOG.log(Level.WARNING, "encountered a problem: {0}", x); This invokes the (Level,String,Throwable) overload rather than the expected (Level,String,Object) overload. Need to translate to: LOG.log(Level.WARNING, "encountered a problem: {0}", new Object[] {x}); I guess the same would apply if the single format param were of a reference array type.