JavaRebel

• Expert Rating

  3.50 / 5

• User Rating

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• Price

  $ 149.00 (AUD)

Ian Harac PC World (US online) 30/04/09 Follow @pcworldau

Pros

• Can save time

Cons

• There's a risk that sloppy programmers will misuse it

Bottom Line

A potentially useful and cost-saving tool, if you're a programmer it's worth grabbing the 30-day trial of JavaRebel.

Would you buy it?

• Yes 0
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Using JavaRebel is extremely simple: just pass an appropriate command when you invoke your Java Virtual Machine. It took us about 30 seconds to get it working in Eclipse. Once it's there, it's transparent - and useful.

To test JavaRebel, we launched an application, then, while the application was running, added in some additional output code to the event handler for a button.

After a second or two, we received a notice in our console window that the relevant classes had been reloaded, and the button now executed its modified behaviour.

We can foresee this saving a tremendous amount of debugging time. Even a few minutes a day saved re-launching apps adds up, over a year, to hours or even days of productivity, depending on re-deployment time after minor edits.

There are a few changes it can't handle - you can't change class hierarchy or implement new interfaces, for example, but it's unlikely you'd be making changes like that during a standard edit-compile-test cycle.

There is also a risk factor; if the app you're working on is "live" and you are careless with your configuration, you could introduce new bugs into running code. However, that's a user error and hardly the fault of the program.

The trial version of JavaRebel lasts for 30 days and prints a message in the console window when run. This should be long enough to determine if the utility provided is worth it.