[proguard] java.io.IOException: Can‘t read [F:\e\java\jdk1.8.0_101\jre\lib\rt.jar] (Can‘t process class [com/oracle/net/Sdp$1.class] (Unsupported version number [52.0] for class format))
不要只看前半段，关键信息是 Unsupported version number [52.0]
降低jdk版本到1.7 也许1.6 就好了
版本对照表
http://docs.oracle.com/javame/config/cldc/opt-pkgs/api/cldc/api/doc-files/CLDCvm.html
java.io.IOException: Can't read [\jre\lib\rt.jar]
原文：http://www.cnblogs.com/zno2/p/5897401.html