Is JRebel ever used in production environments? What can it reload on the JVM?

Question

Is JRebel ever used in production environments? Is it something to just help you develop or is it appropriate for reloading things (especially next gen languages (non-Java)) on the JVM? What (at the byte code and Java language level) can it reload?

Answer 1

JRebel is a tool for development. LiveRebel (based on JRebel) is the tool you're probably thinking of

Answer 2

As Anton said: JRebel is very useful for development. Especially if you have a large deployment time JRebel could enhance your dev experience a lot. BTW They offer licenses to open source projects and they do http://my.jrebel.com. At stackoverflow or zeroturnaround they describe how jrebel works.

Take a look into their feature comparison to the normal jvm hotswap.

Alternatives:

• normal jvm hotdeployment (like with jetty or netbeans etc?)
• https://github.com/fakereplace
• javeleon (?this was open source some time ago!?).