[oe] [meta-java]: java and javac in path provided by cocao and ecj

[Khem Raj]

> On Sep 6, 2016, at 2:35 AM, Pascal Bach <pascal.bach at siemens.com> wrote:
> 
> Hi
> 
> 
> While diving into meta-java I noticed the following.
> 
> The java version that is found by default in an SDK is provided by cacao-native and the javac version by ecj-native.
> Both of these are very old and I get errors if I try to compile newer java packages as for example Ant 1.9.7.
> 
> I was wondering if this is intentional and there is something I'm missing.
> 
> In my opinion it would be better if java and javac were provided by recent JDK/JRE like OpenJDK 8.
> So in relation to my proposal to unify the virtual/java handling I think it would make sense to clean up the java bootstrapping too.
> 
> The proposal is to not have anything from the bootstrapping process in the PATH. This means no javac from ecj not old versions of ant, no IcedTea 7 binaries.
> But only the final openjdk-8-native binaries that also provide virtual/jdk8-native. I guess this would mean to move all the boostrap components to a different filesystem location maybe under {sysroot_native}/opt somewhere. IceadTea already seems build up kind of a fake-jdk by linking the binaries. So instead of doing that ecj and cacoa could directly install to {sysroot_native}/opt/java-bootstrap and IceadTea can then use that. Also other bootstrap packages like old ant version could go to that location.
> 
> I attached a graphic that tries to explain how the new bootstrap process could look like and where a host provided java would fit into that process.
> 
> Does this make sense or am I completely off?

I think this is fine, you can follow the gcc-initial trail from OE-Core on creating a bootstrap sysroot or even stash them into sysroot
somewhere they can then be used from subset of recipes which need them

> 
> Pascal
> 
> 
> <Java Bootstrap.png>--
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