java.lang.UnsupportedClassVersionError

[펌] error : java.lang.UnsupportedClassVersionError
기억보조
Unsupported major.minor version 48.0 ==>jdk 1.4
Unsupported major.minor version 49.0 ==>jdk 5.0
Unsupported major.minor version 50.0 ==>jdk 6.0