Can’t figure out why ScriptEngine engine is null in code

This is some of the code I’m running for a MapleStory server. Whenever a script for an event like talking to an NPC is supposed to occur, this script will be run to create a scripting path for …

Caused by: java.lang.NoClassDefFoundError: io/jsonwebtoken/Jwts

i am using jjwt-0.9.1.jar and runtime gives this exception for jersey reset API call. When i use this code using java main() method, its works perfectly but when i call from servlet to that class, …

Are Locks AutoCloseable?

Are Locks auto-closeable? That is, instead of: Lock someLock = new ReentrantLock(); someLock.lock(); try { // … } finally { someLock.unlock(); } …can I say: try (Lock someLock = new …