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From "Rory O'Donnell" <rory.odonn...@oracle.com>
Subject Re: Apache MyFaces dependencies on JDK-Internal APIs
Date Mon, 22 Jun 2015 11:30:51 GMT
Hi,

Just wondering if anyone has had a chance to run the jdeps tool to check 
for dependencies on JDK-Internal APIs ?

Rgds,Rory

On 15/06/2015 14:08, Rory O'Donnell wrote:
>
> Hi,
>
> My name is Rory O'Donnell, I am the OpenJDK Quality Group Lead.
>
> I'm contacting you because your open source project seems to be a very 
> popular dependency for other open source projects.
> As part of the preparations for JDK 9, Oracle’s engineers have been 
> analyzing open source projects like yours to understand usage. One 
> area of concern involves identifying compatibility problems, such as 
> reliance on JDK-internal APIs.
>
> Our engineers have already prepared guidance on migrating some of the 
> more common usage patterns of JDK-internal APIs to supported public 
> interfaces.  The list is on the OpenJDK wiki [0].
>
> As part of the ongoing development of JDK 9, I would like to inquire 
> about your usage of  JDK-internal APIs and to encourage migration 
> towards supported Java APIs if necessary.
>
> The first step is to identify if your application(s) is leveraging 
> internal APIs.
>
> /Step 1: Download JDeps. /
>
>     Just download a preview release of JDK8(JDeps Download
>     <https://jdk8.java.net/download.html>). You do not need to
>     actually test or run your application on JDK8.  JDeps(Docs
>     <http://docs.oracle.com/javase/8/docs/technotes/tools/unix/jdeps.html>)
>     looks through JAR files and identifies which JAR files use
>     internal APIs and then lists those APIs.
>
> /Step 2: To run JDeps against an application/. The command looks like:
>
>     jdk8/bin/jdeps -P -jdkinternals *.jar > your-application.jdeps.txt
>
>     The output inside your-application.jdeps.txt will look like:
>
>     your.package (Filename.jar)
>           -> com.sun.corba.se            JDK internal API (rt.jar)
>
> _3rd party library using Internal APIs:_
> If your analysis uncovers a third-party component that you rely on, 
> you can contact the provider and let them know of the upcoming 
> changes. You can then either work with the provider to get an updated 
> library that won't rely on Internal APIs, or you can find an 
> alternative provider for the capabilities that the offending library 
> provides.
>
> _Dynamic use of Internal APIs:_
> JDeps can not detect dynamic use of internal APIs, for example through 
> reflection, service loaders and similar mechanisms.
>
> Rgds,Rory
>
> [0] 
> https://wiki.openjdk.java.net/display/JDK8/Java+Dependency+Analysis+Tool
> -- 
> Rgds,Rory O'Donnell
> Quality Engineering Manager
> Oracle EMEA , Dublin, Ireland

-- 
Rgds,Rory O'Donnell
Quality Engineering Manager
Oracle EMEA , Dublin, Ireland


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