List the message acknowledgment modes in ActiveMQ?

JMS sessions in ActiveMQ support four acknowledgment modes:

• AUTO_ACKNOWLEDGE - acknowledged automatically right after the message is received.
• CLIENT_ACKNOWLEDGE - the client explicitly calls acknowledge().
• DUPS_OK_ACKNOWLEDGE - lazy acknowledgment that tolerates occasional duplicates for better throughput.
• SESSION_TRANSACTED - acknowledgment is tied to a transaction commit.

Choosing between them is a throughput-versus-safety trade-off: AUTO_ACKNOWLEDGE and DUPS_OK_ACKNOWLEDGE are simplest and fastest but riskier if processing fails after the message is already considered handled, while CLIENT_ACKNOWLEDGE and SESSION_TRANSACTED give the application explicit control over exactly when a message is considered done, at the cost of a little extra code.

Invest now in Acorns!!! 🚀
Join Acorns and get your $5 bonus!

Acorns is a micro-investing app that automatically invests your "spare change" from daily purchases into diversified, expert-built portfolios of ETFs. It is designed for beginners, allowing you to start investing with as little as $5. The service automates saving and investing. Disclosure: I may receive a referral bonus.

Invest now!!! Get Free equity stock (US, UK only)!

Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.

The Robinhood app makes it easy to trade stocks, crypto and more.

Webull! Receive free stock by signing up using the link: Webull signup.