RFR: 8286444: javac errors after JDK-8251329 are not helpful enough to find root cause [v2]

[Christoph Langer]

> After https://bugs.openjdk.java.net/browse/JDK-8251329, javac throws errors when the classpath
> contains jar files with . or .. in its name. The error message, however, does not help to find
> the culprit. This could be improved.

Christoph Langer has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into jdk-8286444
 - Separate zips change from this PR
 - JDK-8286444
   
   Improve error message in javac compilation when jar files with . or .. are in classpath

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8616/files
  - new: https://git.openjdk.java.net/jdk/pull/8616/files/059d7fe1..3a196995

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8616&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8616&range=00-01

  Stats: 7333 lines in 220 files changed: 4289 ins; 1723 del; 1321 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8616.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8616/head:pull/8616

PR: https://git.openjdk.java.net/jdk/pull/8616