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When user enters path with symbolic link on UNIX anywhere in installer GUI symbolic links are resolved (File.getAbsolutePath()). Solution is not to use getAbsolutePath or getCanonicalPath. Instead we could try java.net.URI.normalize to resolve relative path and remove ../ segments from path. Eg. /home/user/../user should be resolved to /home/user, ../../user should be resolved to /home/user.
Assigned to new owner.
The useful solution could be done using java.nio.file.Path - normalize()
First attempt in http://hg.netbeans.org/core-main/rev/232dcb37e51a
Fixed in changeset: http://hg.netbeans.org/core-main/rev/8354c1b7bfc9