binding issues

[Sundararajan Athijegannathan]

Will you please submit a bug with a compilable/runnable test case attached?

Thanks,
-Sundar

On 11/01/17, 11:09 PM, Andreas Mueller wrote:
> Hi,
>
> it seems I have a problem understanding Nashorn’s bindings...
>
> I have multiple scripts, each independent of each other. They should run concurrently with their own context and engine scope bindings. This is created as follows for each script:
>
> ScriptEngineManager manager = new ScriptEngineManager();
> ScriptEngine engine = manager.getEngineByName((String) entity.getProperty("script-language").getValue());
> if (engine == null)
>      throw new Exception("Engine for script-language '" + entity.getProperty("script-language").getValue() + "' not found!");
> ScriptContext newContext = new SimpleScriptContext();
> streamContext.engineScope = newContext.getBindings(ScriptContext.ENGINE_SCOPE);
>
> Internally we have a Java-based processor which calls Javascript functions (callbacks). It is always the same thread.
>
> It works fine when I start a script the first time. If I stop it (without stopping the JVM) and restart it (it runs through the code above) or if I run another script concurrently, I’m getting problems in so far that calls inside a Javascript callback to Java objects that set data don’t work. The data is not null on the Javascript callback but null inside the Java method.
>
> Here is an example callback:
>
> stream.create().memoryGroup("queues", "name").onCreate(function (memoryGroup, key) {
>      stream.create().memory(key);
>      print("Add:"+ key+"="+stream.memory(key));
> });
>
> The above “stream.create().memory(key)” is a Java method that has a printout:
>
> AddMem: orderpos, mem=HeapMemory{name='orderpos’}
>
> But when I retrieve it with "stream.memory(key)” in the print statement of the Javascript function I’m getting:
>
> Add:orderpos=null
>
> For me this points to the bindings, e.g. a binding from a previous running instance of the script or something else. Can somebody provide some help? What do I need to do to have always a clean instance of a binding when I rerun a script without stopping the JVM?
>
> Thanks,
> Andreas
>