Hi
this makes the situation *much* better. Thank you!
I just read the discussion of the issue you linked to. I wonder why not
to use this property of groovy.use.classvalue=true as the default
setting? At least in my case it seems that the created dynamic classes
are collected as well.
Tino
Am 27.06.2016 um 20:25 schrieb jwagenleitner [via Groovy]:
> Adding the following system property may help to extend the time
> before OOM:
>
> groovy.use.classvalue=true
>
> At least for me on Groovy 2.4.7 with jdk8_91 using that property let
> the loop run 25 minutes (made about half the iterations) vs. ~2.5
> minutes without the property. I used a 64m heap.
>
> I believe the problem is related to GROOVY-7683.
>
> On Fri, Jun 24, 2016 at 11:12 PM, t.schoellhorn <[hidden email]
> </user/SendEmail.jtp?type=node&node=5733552&i=0>> wrote:
>
> Hi, we are using Groovy in our web-application. There we create a
> "lot" of dynamic String and are handling that with the
> TemplateEngine as we need more complex expressions there. Now we
> noticed that we are running into a kind of weird OOM situation. I
> could narrow the problem down to a quite simple reproducible example:
>
> package kos.tools.template;
>
> import java.util.HashMap;
> import java.util.Map;
>
> import javax.script.Bindings;
> import javax.script.ScriptEngine;
> import javax.script.ScriptEngineManager;
> import javax.script.SimpleBindings;
>
> public class Test {
>
>
> public static void main(String[] args) throws Exception {
> ScriptEngineManager factory = new ScriptEngineManager();
> ScriptEngine engine = factory.getEngineByName("groovy");
>
> String template = "step-${i}";
>
> String groovy =
> "def engine = new
> groovy.text.GStringTemplateEngine();\n" +
> "def res =
> engine.createTemplate(template).make(bindings);\n" +
> "return res.toString();";
>
> for (int i = 0; i < (10000000); i++) {
> Bindings vars = new SimpleBindings();
> vars.put("template", template);
>
> Map<String, Object> templateObjects = new HashMap<>();
> vars.put("bindings", templateObjects);
> templateObjects.put("i", i);
>
> Object res = engine.eval(groovy, vars);
>
> if (i % 100 == 0) {
> System.out.println("->" + res);
> }
> }
> }
>
> }
>
> Running that example with an Oracle JDK 1.8 and a quite small
> memory (just for keeping the running time small) of 32M leads to
> an OOM at around 2500 steps. I opened up a disussion on
> Stackoverflow where John Vint gave me some hints (see here
>
> <http://stackoverflow.com/questions/37992822/groovy-templateengines-and-outofmemory-possible-memory-leak?>)
> and it might be also a bug of the GarbageCollector itself. But in
> essence I think there should be a way to use the TemplateEngine in
> a stable way. I am happy for any suggestions and examples of how
> to solve this situation. Tino
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--
Tino Schöllhorn
Diplom Wirtschaftsinformatiker
Geschäftsführer
Plattform GmbH
Gabelsbergerstr. 5
68165 Mannheim
Tel: 0621-58679312
E-Mail: t.schoellh...@plattform-gmbh.de
Internet: http://www.plattform-gmbh.de
Registergericht: Amtsgericht Mannheim, HRB 9955
Geschäftsführer: Olaf Kellermeier, Tino Schöllhorn
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