question: public void test_emptyJournal ( ) throws IOException , InterruptedException , ExecutionException { final File out = File . createTempFile ( getName ( ) , Options . JNL ) ; try { final Journal src = getStore ( getProperties ( ) ) ; try { try { final Future < Journal > f = src . compact ( out ) ; final Journal newJournal = f . get ( ) ; try { newJournal . destroy ( ) ; } finally { fail ( "Expecting " + IllegalArgumentException . class ) ; } } catch ( IllegalArgumentException ex ) { log . info ( "Ignoring expected exception: " + ex ) ; } } finally { src . destroy ( ) ; } } finally { out . delete ( ) ; } }
target:  Verifies exception if there are no commits on the journal (the lastCommitTime will be zero which does not identify a valid commit point).