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From "Aled Sage (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BROOKLYN-528) Memory leak: proxy class (and java.lang.reflect.* instances) per entity
Date Thu, 31 Aug 2017 08:41:00 GMT
Aled Sage created BROOKLYN-528:
----------------------------------

             Summary: Memory leak: proxy class (and java.lang.reflect.* instances) per entity
                 Key: BROOKLYN-528
                 URL: https://issues.apache.org/jira/browse/BROOKLYN-528
             Project: Brooklyn
          Issue Type: Bug
    Affects Versions: 0.11.0
            Reporter: Aled Sage


There is a memory leak when creating and deleting entities.

After creating and then deleting a really simple app many times ({{services: [{type: org.apache.brooklyn.entity.stock.BasicApplication}]}}),
there are a lot of classes with names like {{class com.sun.proxy.$Proxy10033}} (probably one
per entity we created!). This also leads to a huge number of instances of things like {{java.lang.reflect.Method}}.

---
Looking at the code in {{org.apache.brooklyn.core.objs.proxy.InternalEntityFactory.createEntityProxy()}},
when it calls {{java.lang.reflect.Proxy.newProxyInstance}} it first creates a new {{AggregateClassLoader}}
instance and passes that in. This causes {{newProxyInstance}} to create a new class every
time.

The fix should be simple: to reuse {{AggregateClassLoader}} instances, rather than creating
new ones.




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