So I downloaded the latest NetBeans (7.4) and hunted through the menus. I found Refactor > Inspect and Transform which has a Configuration choice for Convert to JDK 7.
TIP: Set your tab and formatting (e.g. switches) preferences before you run Inspect and Transform. It didn't seem to work correctly when I changed the preferences while Inspect and Transform was open.
It found the following applicable changes in my code:
- Use diamond inference
- Convert to switch over strings
- Convert to try-with-resources
- Replace with multicatch
- Replace with multicatch catching specific exceptions
The majority were diamond inference. There would have been even more, but I already used Guava's helpers such as Lists.newArrayList which avoid repeating the generic types.
Convert to try-with-resources didn't merge surrounding try-catch's but there were only a few of these so it was easy to fix them manually.
I wasn't too sure about the last item - replacing catching general exceptions with catching multiple specific exceptions. It seemed like it wouldn't catch everything it did before so I didn't accept those changes. (unchecked them)
But when I clicked on Do Refactoring I got a little "Refactoring" window that was blank. I assumed it was working and left it for a while. But it never went away, and when I tried to close it I couldn't. So I exited out of NetBeans (with no problems) and tried it again. This time nothing happened (except the Inspect and Transform window closed). I thought maybe it was finished but nothing had changed. I ran it again and got only a few of the issues and Do Refactoring worked (on those few). Next time I ran it, I got the long list again. I finally noticed the error marker in the bottom right. I submitted the error and it appears to be a known bug :-(
I ended up doing one package at a time and that seemed to work fine.
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