If I am mistaken, Java 1.6 vm on Mac is only 64 bits. To use it, you will need a 64-bit version of Eclipse. The only 64-bit eclipse port on mac is the new cocoa construct, find here .
In a few weeks, the Galileo release will end, where you can find the 64-bit cocoa port by going to Eclipse Classic β Other downloads.
If you want to keep the current eclipse installation, you will have to do what the other answers suggest and change them to use 1.5
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