Chetan Mehrotra created FELIX-4424:
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Summary: ClassLoader leak in Http Service ServletContextManager
Key: FELIX-4424
URL: https://issues.apache.org/jira/browse/FELIX-4424
Project: Felix
Issue Type: Bug
Components: HTTP Service
Reporter: Chetan Mehrotra
While analyzing heap dump for classloader leaks using script [1] following
possible leak was reported
{noformat}
com.day.crx.packmgr.impl.AuthHttpContext@0x124214d18
Following are few of the live paths found
Live path
com.day.crx.packmgr.impl.AuthHttpContext@0x124214d18
java.util.HashMap$Entry@0x12429db50
[Ljava.util.HashMap$Entry;@0x1238f47b0
java.util.HashMap@0x1238f4780
org.apache.felix.http.base.internal.context.ServletContextManager@0x1238f4760
[*]
org.apache.felix.http.base.internal.service.HttpServiceImpl@0x1238f45c0 [*]
org.apache.felix.framework.ServiceRegistry$UsageCount@0x1238f45a8
[Lorg.apache.felix.framework.ServiceRegistry$UsageCount;@0x129efb430
java.util.HashMap$Entry@0x1235ee950
[Ljava.util.HashMap$Entry;@0x1249e2b78
java.util.HashMap@0x123484668
org.apache.felix.framework.ServiceRegistry@0x12339c108
org.apache.felix.framework.ServiceRegistrationImpl@0x126a7a3c8
java.util.concurrent.atomic.AtomicReference@0x126a7a3b8
org.apache.felix.scr.impl.manager.DelayedComponentManager@0x126a79ab8 [*]
java.util.HashMap$Entry@0x126a9c3f0
java.util.HashMap$Entry@0x1286ce7a0
[Ljava.util.HashMap$Entry;@0x124884030
java.util.HashMap@0x1238f1ce0
org.apache.felix.scr.impl.ComponentRegistry@0x1236757f0 [*]
org.apache.felix.scr.impl.BundleComponentActivator@0x127152bd0
[*]
org.apache.felix.scr.impl.config.ImmediateComponentHolder@0x127153a08 [*]
org.apache.felix.scr.impl.manager.DelayedComponentManager@0x127154398 [*]
org.apache.felix.scr.impl.manager.DependencyManager@0x127154720
[*]
{noformat}
In our case the AuthHttpContext was being registered via the Whiteboard
pattern. The dump shows that ServletContextManager [2] uses the HttpContext as
key for the map however it is never removed. If our bundle would had used
HttpService directly then internal map would have been GC upon bundle
deactivation.
In Felix HttpService is registered as a ServiceFactory however as all
interactions with HttpService is done via Whiteboard bundle the HttpService is
bound to Whiteboard bundle. So such HttpContext might remain for the lifetime
of whiteboard bundle and hence cause classloader leak.
[1] https://gist.github.com/chetanmeh/8860776
[2]
https://github.com/apache/felix/blob/trunk/http/base/src/main/java/org/apache/felix/http/base/internal/context/ServletContextManager.java
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