If you're using a Mac with an M3 chip, here's how you can set up JDK 7 for iReport 4.7.1 :

Download JDK 7: You can download it from the Oracle JDK 7 archive.

Locate the iReport configuration file:

1. Go to Applications.
2. Right-click on the iReport icon and select "Show Package Contents".
3. Navigate to: Contents/Resources/ireport/etc/.
4. Edit the ireport.conf file:
5. Open the file ireport.conf in a text editor, Find the line starting with jdkhome.
6. Update it to point to your JDK 7 installation path. For example:
7. jdkhome=".../JavaAppletPlugin.plugin/Contents/Home/"
8. Save the changes, and iReport should now use JDK 7.