[rfc][icedtea-web][patch] Patch to build icedtea-web 1.5.1 with java9

[Fridrich Strba]

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Hello, good people,

I tried to use icedtea-web plugin with java9 and had to use the
attached patch to be able to build it against java9.

Somehow, the Vector<?> was resulting in problems with resolution
resolution what function to call. Removing the diamond operator there
worked to pass the compilation. Not 100% sure though what is going on
there.

As for the sun.misc.Ref, it is not existing any more in java9. I
looked at the implementation of AppletImageRef and it is internally in
java9 implemented using the java.lang.ref.SoftReference, hence the
modification. Not sure though how to handle that in a more generic
way, since I don't assume that will work with other implementation of
AppletImageRef and -- to be honest -- I have no clue whether my patch
has any sense at all.

With this patch, I was able to build icetea-web against java9 and also
the test applets that I tried worked.

Please, comment on this and don't hesitate to tell me it is completely
wrong if that is the case.

Cheers

Fridrich
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