Try to check the Java version from first page of OpenFire admin console, I had this problem and it was because of outdated java version, even I was upgraded my java from 6 to 7 but OpenFire still was using the 6 one.
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Try to check the Java version from first page of OpenFire admin console, I had this problem and it was because of outdated java version, even I was upgraded my java from 6 to 7 but OpenFire still was using the 6 one.