Hyung, there two rar formats, neither of them is equivalent to the tar format. The one from J2EE packaging (Resource ARchive) and the compression format - from winrar.
If yours is Resource ARchive, you can use ujar ant task. It's the same format as any jar file, just with different extension.
If it's the other format -RAR compressed file, you may try to execute the decompression binaries (i.e. unrar) that extract the files using exec task.
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