Grails3.3.9 as JSON variable dont GC

[zhangjiayu139]

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Defines a utils class, Used to convert domain instances into Map, The following code： public static def domainFormat(domain) { def result = domain as JSON try{ return (Map)JSON.parse(result.toString()) }catch(e){ e.printStackTrace() } } However, in the production environment variables are not recycled（GC）,This often results in full memory and FULL CPU， Grab the stack memory of the production environment and analyze all points to this public method

Task List

• [ ] Steps to reproduce provided
• [ ] Stacktrace (if present) provided
• [ ] Example that reproduces the problem uploaded to Github
• [ ] Full description of the issue provided (see below)

Steps to Reproduce

1. TODO defined utils class:

public static def domainFormat(domain) { def result = domain as JSON try{ return (Map)JSON.parse(result.toString()) }catch(e){ e.printStackTrace() } }

2. TODO def book = Book.get(1) Map map = domainFormat(book ) map.tttt = "demo" render map as JSON
3. TODO

Expected Behaviour

Tell us what should happen

Actual Behaviour

Tell us what happens instead

Environment Information

• Operating System: win10
• Grails Version: 3.3.9
• JDK Version: 1.8
• Container Version (If Applicable): TODO

Example Application

• TODO: link to github repository with example that reproduces the issue

[davydotcom]

This is a really odd way to do this. as JSON is actually being deprecated in favor of grails-views. That being said I use as JSON often and have never seen it get stuck in memory like this. It would seem something else is likely holding onto a reference of your object. Or maybe something cyclical exists in your map.

[davydotcom]

The stack implies an instanced closure may be sticking around as well yet your sample code contains no closures

[zhangjiayu139]

@davydotcom I'm using it in Service, to turn the object into a Map and add other property values，I'm confused, too

[puneetbehl]

@zhangjiayu139 you could use JsonViewTemplateEngine instead of as JSON. See http://views.grails.org/latest/#_the_jsontemplateengine

[jeffscottbrown]

However, in the production environment variables are not recycled（GC）

I don't understand what you mean. Is it the case that every time you do the conversion, a new instance of middol.utils.DomainUtils$_domainListFormat_closure1 is being allocated and never collected? If not, what is it that isn't being garbage collected? Thanks for any feedback!