Find java build version of the class files in a jar file using ant? -


is there ant task allows me @ jar file , figure out java version class files in jar compiled for?

you're going have write one. existing tasks, it's going ugly - isn't ant shines at.

you unzip jar, , either exec out file (unix machines), see 1 version 51 (java 7)

$file myclass.class myclass.class; compiled java class data, version 51.0

or if you're using windows use javap -v

$javap -v myclass.class classfile  myclass.class   last modified sep 24, 2013; size 7317 bytes   md5 checksum 73667731fe2ec6519b1c0c4676a96c70 public class com.foo.myclass   minor version: 0   major version: 51

you'd have use use replaceregex or sauce find major version.

you're going better off writing small task, can use apache's byte code engineering library pull out version.


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