RFR: JDK-8281006 Module::getResourceAsStream should check if the resource is open unconditionally when caller is null [v3]

[Tim Prinzing]

> Created a test called NullCallerGetResource to test Module::getResourceAsStream and Class::getResourceAsStream from the native level.
> 
> At the java level the test builds a test module called 'n' which opens the package 'open' to everyone. There is also a package 'closed' which is neither opened or exported. Both packages have a text file called 'test.txt'. The open package has a class called OpenResources and the closed package has a class called ClosedResources. The native test is launched with the test module n added.
> 
> At the native level the test tries to read both the open and closed resource from both the classes and the module. It performs the equivalent of the following java operations:
> 
> Class c = open.OpenResources.fetchClass();
> InputStream in = c.getResourceAsStream("test.txt");
> assert(in != null); in.close();
> 
> Module n = c.getModule();
> in = n.getResourceAsStream("open/test.txt");
> assert(in != null); in.close();
> 
> Class closed = closed.ClosedResources.fetchClass();
> assert(closedsStream("test.txt") == null);
> assert(n.getResourceAsStream("closed/test.txt") == null);
> 
> The test initially threw an NPE when trying to fetch the open resource. The Module class was fixed by removing the fragment with the (caller == null) test in getResourceAsStream, and changing the call to isOpen(String,Module) to use EVERYONE_MODULE if the caller module is null.

Tim Prinzing has updated the pull request incrementally with one additional commit since the last revision:

  revert Module::isOpen

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8134/files
  - new: https://git.openjdk.java.net/jdk/pull/8134/files/4b344e4d..912896d7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8134&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8134&range=01-02

  Stats: 10 lines in 2 files changed: 5 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8134.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8134/head:pull/8134

PR: https://git.openjdk.java.net/jdk/pull/8134