I think you can ignore the libEGL message, I think its part of a disconnect between linux and closed source drivers. Interesting that Gallium reports 3.1 opengl capability, which should be sufficient for processing-2.0. However certainly with Nvidia graphics cards the performance is greatly enhanced with the closed source drivers (well 3D acceleration in particular). Regarding "symbolic"link to java, using it allows you to choose which jdk to use so you could link to Oracle jdk, even when you have OpenJDK installed. Of course on Mint you could use update-alternatives to choose between java versions but that is more work.
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