Spec
http://docs.oracle.com/javase/8/docs/api/javax/script/ScriptContext.html#getAttribute-java.lang.String-
says "Returns null if no attribute with the name exists in any scope."

Spec
http://docs.oracle.com/javase/8/docs/api/javax/script/ScriptContext.html#getAttributesScope-java.lang.String-
says: "Returns: The lowest scope. Returns -1 if no attribute with the given name is defined in any scope."


However for GLOBAL_SCOPE setting attribute value leads to inability to get the value which was set and the scope which was used.

Consider the following code:

        new ScriptEngineManager()
            .getEngineFactories()
            .stream()
            .map(ScriptEngineFactory::getScriptEngine)
            .map((engine) -> {
                System.err.println("engine: " + engine);
                return engine.getContext();
            })
            .forEach(c -> {
                c.setAttribute("name1234", "value", ScriptContext.GLOBAL_SCOPE);
                System.err.println("value = " + c.getAttribute("name1234"));
                System.err.println("scope = " + c.getAttributesScope("name1234"));
            });

The output will contain

engine: jdk.nashorn.api.scripting.NashornScriptEngine@f3eef9
value = null
scope = -1

The following JCK9 test will fail due to this issue:

api/javax_script/ScriptContext/index.html#SetGetAttribute[setGet]
api/javax_script/ScriptContext/index.html#SetGetAttribute[getAttributesScope]