question: public static Boolean verifyJWT ( final String jwt , final String secret ) throws HmacException { try { SignedJWT signedJWT = SignedJWT . parse ( jwt ) ; JWSVerifier jwsVerifier = new MACVerifier ( secret ) ; return signedJWT . verify ( jwsVerifier ) ; } catch ( ParseException | JOSEException ex ) { throw new HmacException ( "Cannot verify JWT" , ex ) ; } }
target:  Verify Json Web Token