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https://issues.apache.org/jira/browse/SLING-3525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997799#comment-13997799
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Carsten Ziegeler commented on SLING-3525:
-----------------------------------------
Apart from Sling creating a thread to startup the framework, the framework is
starting threads for startup as well. And then there is all the custom code
Chetan hints add which is starting thread. For example, if a component starts a
thread and does a lookup of a service from within that thread, you might end up
in the same situation.
In other words, using threads from the appserver's threadpool would require a
rewrite of *all* the code involved - which is a major task. In addition to
that, the framework implementation has no knowledge of an app server.
Maybe, as this is about WebSphere, the application can be deployed in the OSGi
framework of the app server and therefore it should use it's threads?
> Launchpad notification thread cannot access JNDI ressources on Websphere
> ------------------------------------------------------------------------
>
> Key: SLING-3525
> URL: https://issues.apache.org/jira/browse/SLING-3525
> Project: Sling
> Issue Type: Improvement
> Components: Launchpad
> Affects Versions: Launchpad Base 2.5.0
> Environment: Websphere 7 on Linux
> Reporter: Jörg Hoh
> Attachments: was_258f258f_14.04.29_03.14.01.7877107172171903438789
> copy.txt
>
>
> We have an existing JavaEnterprise-based application, which we want to move
> into sling running on IBM Websphere appserver. In some of the resulting
> bundles we need to access JNDI resources.
> We get this exception:
> {code}
> [29.04.14 03:14:01:790 CEST] FFDC
> Exception:javax.naming.ConfigurationException
> SourceId:com.ibm.ws.naming.java.javaURLContextImpl.throwConfigurationExceptionWithDefaultJavaNS
> ProbeId:440 Reporter:java.lang.Class@5ef85ef8
> javax.naming.ConfigurationException: A JNDI operation on a "java:" name
> cannot be completed because the server runtime is not able to associate the
> operation's thread with any J2EE application component. This condition can
> occur when the JNDI client using the "java:" name is not executed on the
> thread of a server application request. Make sure that a J2EE application
> does not execute JNDI operations on "java:" names within static code blocks
> or in threads created by that J2EE application. Such code does not
> necessarily run on the thread of a server application request and therefore
> is not supported by JNDI operations on "java:" names. [Root exception is
> javax.naming.NameNotFoundException: Name comp/env/tm not found in context
> "java:".]
> at
> com.ibm.ws.naming.java.javaURLContextImpl.throwConfigurationExceptionWithDefaultJavaNS(javaURLContextImpl.java:428)
>
> at
> com.ibm.ws.naming.java.javaURLContextImpl.lookup(javaURLContextImpl.java:399)
> at
> com.ibm.ws.naming.java.javaURLContextRoot.lookup(javaURLContextRoot.java:221)
> at
> com.ibm.ws.naming.java.javaURLContextRoot.lookup(javaURLContextRoot.java:161)
> at javax.naming.InitialContext.lookup(InitialContext.java:436)
> ...
> at
> org.apache.sling.launchpad.webapp.SlingServlet.startSling(SlingServlet.java:384)
>
> at
> org.apache.sling.launchpad.webapp.SlingServlet.updated(SlingServlet.java:262)
> at
> org.apache.sling.launchpad.base.impl.SlingFelix$Notifier.run(SlingFelix.java:172)
>
> at java.lang.Thread.run(Thread.java:761)
> Caused by: javax.naming.NameNotFoundException: Name comp/env/tm not found in
> context "java:".
> at
> com.ibm.ws.naming.ipbase.NameSpace.getParentCtxInternal(NameSpace.java:1837)
> at
> com.ibm.ws.naming.ipbase.NameSpace.lookupInternal(NameSpace.java:1166)
> at com.ibm.ws.naming.ipbase.NameSpace.lookup(NameSpace.java:1095)
> at
> com.ibm.ws.naming.urlbase.UrlContextImpl.lookup(UrlContextImpl.java:1235)
> at
> com.ibm.ws.naming.java.javaURLContextImpl.lookup(javaURLContextImpl.java:395)
> ... 60 more
> {code}
> According to the JavaEnterprise spec, you should not create threads on your
> own but use the mechanisms of the appserver (mostly because of the massive
> use of threadlocals to access JDNI and stuff like that). See
> http://stackoverflow.com/questions/533783/why-spawning-threads-in-java-ee-container-is-discouraged
> for some discussion of it.
> We would like the Launchpad to use a "native Websphere thread" so it can
> actually do JNDI lookups, and not to create a new thread "on the fly".
> We would like to avoid any change to the way how JNDI resources are looked up
> in our application.
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