Why is Ant giving me a Unsupported major.minor version error

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Check if tools.jar used during compilation complies with the JRE set. If you are on eclipse, verify the versions as:
Goto Window->Preferences
– Check Ant Runtime by selecting Runtime under Ant in the left pane. Check the Global Entries under classpath tab. You can see the version in folder path.
– On the left pane check installed JREs under Java. Check the version.
I had also got the same problem when my selected JRE was 1.6.0_24 and tools.jar in Ant runtime was coming from jdk 1.7
If both of them are from different versions- 1.6/1.7, correct them by correcting their path.
Typically, tools.jar can be found at :C:\Program Files\Java\jdk1.x.x\lib. Likewise if required add the JRE by pointing it to C:\Program Files\Java\jdk1.x.x\

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