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Remove java.ext.dirs on startup to avoid conflicts and startup errors #4608
Sometimes people install ANTLR or JOGL into their system-wide Java directories, which causes Processing to break and put up strange errors on startup. This can also happen if they put an old copy of pde.jar or core.jar into one of these directories. Or perhaps an application has installed its own copy of one of those JARs.
In 3.2, this has been mitigated, which should fix a lot of weird startup problems.