gistfile1.java

Using JRuby 1.6.2. Running a JRuby script from Java 7, JUnit test case:

public class RubyStdErrTest extends TestCase {

  public void testCatchRubyException() throws Exception {

    ScriptingContainer container = new ScriptingContainer(LocalContextScope.SINGLETHREAD);
    String script =  "raise 'Foo'";

    try {
      container.runScriptlet(script);
    } catch (Throwable t) {
      System.out.println("Caught the exception in Java: " + t.getMessage());
    }
  }
}

Output:

RuntimeError: Foo
  (root) at <script>:1
Caught the exception in Java: (RuntimeError) Foo

I.e., something is logging the exception (to stderr?) before it is caught in the Java code. Ideally I would to be able to disable the internal exception logging and handle it all myself.