Can you describe if there is any effect on signed jars? Including: 1. Will jarsigner be able to sign such a jar? Are all items inside signed? If you sign a jar using jarsigner from different versions of JDK, will there be any difference?
2. Will jarsigner be able to verify such a jar? Will it only verify entries for the current version or all? Will jarsigner from an old JDK verify the new jar? 3. As I know, JarFile has 2 ways to verify a jar file, one using public APIs. One through SharedSecrets.setJavaUtilJarAccess() which can call more methods. Have you confirmed both work? Yes, I'd also like some tests on these. Thanks Max > On 2015年9月30日, at 上午2:13, Steve Drach <steve.dr...@oracle.com> wrote: > > Hi, > > Please review the following webrev that adds support for multi-release jars > as specified in JEP-238. > > Issue: https://bugs.openjdk.java.net/browse/JDK-8132734 > <https://bugs.openjdk.java.net/browse/JDK-8132734> > JEP 238: https://bugs.openjdk.java.net/browse/JDK-8047305 > <https://bugs.openjdk.java.net/browse/JDK-8047305> > Webrev: http://cr.openjdk.java.net/~psandoz/multiversion-jar/jar-webrev/ > <http://cr.openjdk.java.net/~psandoz/multiversion-jar/jar-webrev/> > > A multi-release jar file is a jar file that contains a manifest with a main > attribute named "Multi-Release", and also contains a directory > "META-INF/versions" with subdirectories that contain versioned entries > segregated by the major version of Java platform releases. A versioned entry, > with a version n, in the "META-INF/versions/{n}" directory overrides the > unversioned root entry as well as any entry with a version number i where i > < n. > > The changes in this webrev implement an aliasing mechanism in JarEntry so > that when a JarFile client retrieves a JarEntry, the data from the entry > pointed to by the alias is returned. There are methods to configure whether > or not aliasing is enabled, and if it is, which version of an entry the alias > points to. > > When a JarFile is used by a class loader to load class resources, the default > version retrieved is the runtime version of the Java platform (i.e. a version > 9 entry is returned when the platform is JDK 9). This mechanism can be > configured by System properties. > > Thanks, > Steve
