RFR - 8132734: java.util.jar.* changes to support multi-release jar files

[Wang Weijun]

> 在 2015年10月1日，上午7:53，Steve Drach <steve.drach at oracle.com> 写道：
> 
> - JDK 8 jar signer does not work with a JDK 9 created keystore
> - JDK 8 signed jar with JDK 8 created keystore is not the same size as JDK 9 signed jar with JDK 9 keystore
> - JDK 8 signed jar with JDK 8 created keystore is not the same size as JDK 9 signed jar with the same JDK 8 keystore

The default keystore type in jdk9 is pkcs12. I guess this is why jarsigner in jdk8 does not recognize it.

As for the size, I guess the default signature algorithm or key size might not be the same, say, SHA1withRSA -> SHA256withRSA or 1024 to 2048.

--Max