Created attachment 122026 [details]
Sample NetBeans project to reproduce bug

I've recently migrated big project to Java 7 and used NetBeans 7.2 RC1 to convert code to use new Java 7 features.
However I've noticed problems in the code were existing catch statements were replaced with multi-catch alternatives.

For example this method:
<pre>
private void doImport(File f, Collection<?> importLog) {
        startTransaction();
        try {
            doImportFromFile(f, importLog);
            commitTransaction();
        } catch (Throwable t) {
            rollbackTransaction();
            reThrow(t);
        }
    }
</pre>

Was converted to:
<pre>
private void doImport(File f, Collection<?> importLog) {
        startTransaction();
        try {
            doImportFromFile(f, importLog);
            commitTransaction();
        } catch (IOException | XMLStreamException t) {
            rollbackTransaction();
            reThrow(t);
        }
    }
</pre>

Which is *not* semantically equivalent, because new code does not handle unchecked exceptions anymore!!!

Please find sample project attached. The error can be reproduced always, both using "Inspect and Transform"->"Convert to JDK 7" and using Alt-Enter hint menu on the line with "catch(Throwable)".

JDK version:
java version "1.7.0_05"
Java(TM) SE Runtime Environment (build 1.7.0_05-b05)
Java HotSpot(TM) 64-Bit Server VM (build 23.1-b03, mixed mode)

NetBeans version:
Product Version: NetBeans IDE 7.2 RC1 (Build 201206272359)
Java: 1.7.0_05; Java HotSpot(TM) 64-Bit Server VM 23.1-b03
System: Windows 7 version 6.1 running on amd64; Cp1252; en_US (nb)