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javajavascriptpermissionssecuritymanagernashorn

Nashorn NullPointerException with SecurityManager

I am creating a sandbox program with the nashorn js interpreter, and using a minimalist security manager to restrict what it can do.
The problem is when I call engine.eval(reader) I get a null pointer exception.
I know the reader works because I was able to print the entire file, letter-by-letter. I know this is a permissions issue because if I add AllPermissions then everything works.
So what permissions do I need to run a script in nashorn?

Apparently I messed up my initial tests, it's not just with the file reader, it also happens when I hard-code a string.

Solution

  • I found the problem. Apparently I need this permission to run nashorn:

    java.io.FilePermission, "/usr/lib/jvm/java-8-openjdk/jre/lib/ext/nashorn.jar", "read"