question: public String findDeadlock ( ) { StringBuilder dump = new StringBuilder ( ) ; long [ ] tids ; if ( findDeadlocksMethodName . equals ( "findDeadlockedThreads" ) && tmbean . isSynchronizerUsageSupported ( ) ) { tids = tmbean . findDeadlockedThreads ( ) ; if ( tids == null ) { return null ; } dump . append ( "\n\nFound one Java-level deadlock:\n" ) ; dump . append ( "==============================\n" ) ; ThreadInfo [ ] infos = tmbean . getThreadInfo ( tids , true , true ) ; for ( int i = 1 ; i < infos . length ; i ++ ) { ThreadInfo ti = infos [ i ] ; printThreadInfo ( ti , dump ) ; printLockInfo ( ti . getLockedSynchronizers ( ) , dump ) ; dump . append ( "\n" ) ; } } else { tids = tmbean . findMonitorDeadlockedThreads ( ) ; if ( tids == null ) { return null ; } dump . append ( "\n\nFound one Java-level deadlock:\n" ) ; dump . append ( "==============================\n" ) ; ThreadInfo [ ] infos = tmbean . getThreadInfo ( tids , Integer . MAX_VALUE ) ; for ( int i = 1 ; i < infos . length ; i ++ ) { ThreadInfo ti = infos [ i ] ; printThreadInfo ( ti , dump ) ; } } return ( dump . toString ( ) ) ; }
target:  Checks if any threads are deadlocked. If any, print the thread dump information.