binding issues

Andreas Mueller am at
Thu Jan 12 08:12:53 UTC 2017

Will do. 

Can you tell me whether the engine is shared between scripts? Is there a way to use one engine per script and to start absolute clean (no caches, no refs from previous runs) just like when the JVM was started?


> Am 12.01.2017 um 05:23 schrieb Sundararajan Athijegannathan <sundararajan.athijegannathan at>:
> 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

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