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From Hrishikesh Gadre <gadre.s...@gmail.com>
Subject Re: Fwd: NoClassDefFoundError during graceful shutdown
Date Thu, 11 Feb 2016 02:31:05 GMT
Hi Chris,

I added a check to see if this jar file exists (and is readable) both
inside the ServletFilter init(...) and destroy(...) methods. Most of the
times the check passes. But when I get NoClassDefFoundError, I see that
check is passing during invocation of init(...) method but not during
destroy(...) method. This is really weird behavior.

https://gist.github.com/hgadre/efd959ad1d0f1793b8b2

Thanks
Hrishikesh


On Wed, Feb 10, 2016 at 1:26 PM, Hrishikesh Gadre <gadre.solr@gmail.com>
wrote:

> Hi Chris,
>
> Thanks for the response.
>
> >>This looks like a different issue than you originally reported. Has
> that other issue gone away? Or is this the root cause of the
> originally-reported issue?
>
> I think it is the root cause for the original issue. As per my
> understanding, the FileNotFoundException results in findClass method (WebappClassLoader.java
> line 1647) returning a ClassNotFoundException. After this, I see following
> log entries (sorry didn't include them in my previous email).
>
> Feb 10, 2016 10:00:24 AM org.apache.catalina.loader.WebappClassLoader
> loadClass
>
> FINE: loadClass(org.apache.solr.util.IOUtils, false)
>
> Feb 10, 2016 10:00:24 AM org.apache.catalina.loader.WebappClassLoader
> loadClass
>
> FINE:   Searching local repositories
>
> Feb 10, 2016 10:00:24 AM org.apache.catalina.loader.WebappClassLoader
> findClass
>
> FINE:     findClass(org.apache.solr.util.IOUtils)
>
> Feb 10, 2016 10:00:24 AM org.apache.catalina.loader.WebappClassLoader
> openJARs
>
> FINE: Failed to open JAR
>
> java.io.FileNotFoundException:
> /var/lib/solr/tomcat-deployment/webapps/solr/WEB-INF/lib/antlr-runtime-3.5.jar
> (No such file or directory)
>
> ...
>
> Feb 10, 2016 10:00:24 AM org.apache.catalina.loader.WebappClassLoader
> loadClass
>
> FINE:   Delegating to parent classloader at end:
> org.apache.catalina.loader.StandardClassLoader@65f40964
>
>
> It looks like the WebappClassLoader delegates the loading to the parent
> class loader (WebappClassLoader.java line 1662). Since this jar file is
> inside the WEB-INF/lib only, I think the parent class loader also can not
> load it resulting in ClassNotFoundException in the end. Since the
> FileNotFoundException is logged at the FINE level, it wasn't apparent until
> I turned on FINE level logs for Tomcat.
>
> I also verified that the effective Tomcat user has "execute" permissions
> for the entire
> path (/var/lib/solr/tomcat-deployment/webapps/solr/WEB-INF/lib/). Here is
> the output of namei command,
>
> namei -l
> /var/lib/solr/tomcat-deployment/webapps/solr/WEB-INF/lib/antlr-runtime-3.5.jar
>
> f:
> /var/lib/solr/tomcat-deployment/webapps/solr/WEB-INF/lib/antlr-runtime-3.5.jar
>
> drwxr-xr-x root root /
>
> drwxr-xr-x root root var
>
> drwxr-xr-x root root lib
>
> drwxr-xr-x solr solr solr
>
> drwxr-xr-x solr solr tomcat-deployment
>
> drwxr-xr-x solr solr webapps
>
> drwxr-xr-x solr solr solr
>
> drwxr-xr-x solr solr WEB-INF
>
> drwxr-xr-x solr solr lib
>
> -rw-r--r-- solr solr antlr-runtime-3.5.jar
>
>
> Thanks
>
> Hrishikesh
>
>
>
>
>
>
> On Wed, Feb 10, 2016 at 12:30 PM, Christopher Schultz <
> chris@christopherschultz.net> wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Hdishikesh,
>>
>> On 2/10/16 2:12 PM, Hrishikesh Gadre wrote:
>> > Hi Chris,
>> >
>> > I did some more troubleshooting by enabling Tomcat debug logs. It
>> > turns out that the class loading is failing due to
>> > FileNotFoundException for antlr-runtime.jar file. I am not sure why
>> > is that the case since I can see that jar file at the location
>> > mentioned.
>> >
>> > Feb 10, 2016 10:00:24 AM
>> > org.apache.catalina.loader.WebappClassLoader loadClass FINE:
>> > loadClass(org.apache.solr.util.IOUtils, false) Feb 10, 2016
>> > 10:00:24 AM org.apache.catalina.loader.WebappClassLoader loadClass
>> > FINE:   Searching local repositories Feb 10, 2016 10:00:24 AM
>> > org.apache.catalina.loader.WebappClassLoader findClass FINE:
>> > findClass(org.apache.solr.util.IOUtils) Feb 10, 2016 10:00:24 AM
>> > org.apache.catalina.loader.WebappClassLoader openJARs FINE: Failed
>> > to open JAR java.io.FileNotFoundException:
>> > /var/lib/solr/tomcat-deployment/webapps/solr/WEB-INF/lib/antlr-runtime
>> - -3.5.jar
>> >
>> >
>> (No such file or directory)
>> > at java.util.zip.ZipFile.open(Native Method) at
>> > java.util.zip.ZipFile.<init>(ZipFile.java:215) at
>> > java.util.zip.ZipFile.<init>(ZipFile.java:145) at
>> > java.util.jar.JarFile.<init>(JarFile.java:154) at
>> > java.util.jar.JarFile.<init>(JarFile.java:118) at
>> > org.apache.catalina.loader.WebappClassLoader.openJARs(WebappClassLoade
>> r.java:2754)
>> >
>> >
>> at
>> > org.apache.catalina.loader.WebappClassLoader.findResourceInternal(Weba
>> ppClassLoader.java:2994)
>> >
>> >
>> at
>> > org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappC
>> lassLoader.java:2789)
>> >
>> >
>> at
>> > org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoad
>> er.java:1159)
>> >
>> >
>> at
>> > org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoad
>> er.java:1647)
>> >
>> >
>> at
>> > org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoad
>> er.java:1526)
>> >
>> >
>> at org.apache.solr.cloud.Overseer.doClose(Overseer.java:1253)
>> > at org.apache.solr.cloud.Overseer.close(Overseer.java:1246) at
>> > org.apache.solr.cloud.ZkController.close(ZkController.java:500) at
>> > org.apache.solr.core.ZkContainer.close(ZkContainer.java:280) at
>> > org.apache.solr.core.CoreContainer.shutdown(CoreContainer.java:374)
>> >
>> >
>> at
>> > org.apache.solr.servlet.SolrDispatchFilter.destroy(SolrDispatchFilter.
>> java:205)
>> >
>> >
>> at
>> > org.apache.catalina.core.ApplicationFilterConfig.release(ApplicationFi
>> lterConfig.java:360)
>> >
>> >
>> at
>> > org.apache.catalina.core.StandardContext.filterStop(StandardContext.ja
>> va:4111)
>> >
>> >
>> at org.apache.catalina.core.StandardContext.stop(StandardContext.java:48
>> 80)
>> > at
>> > org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:
>> 1279)
>> >
>> >
>> at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1385)
>> > at
>> > org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:
>> 307)
>> >
>> >
>> at
>> > org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycle
>> Support.java:142)
>> >
>> >
>> at
>> > org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase
>> .java:1392)
>> >
>> >
>> at
>> > org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.pr
>> ocessChildren(ContainerBase.java:1656)
>> >
>> >
>> at
>> > org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.pr
>> ocessChildren(ContainerBase.java:1665)
>> >
>> >
>> at
>> > org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.ru
>> n(ContainerBase.java:1645)
>> >
>> >
>> at java.lang.Thread.run(Thread.java:745)
>> >
>> > I also verified that this jar file has appropriate permissions
>> > set.
>> >
>> > sudo -u solr ls -all
>> > /var/lib/solr/tomcat-deployment/webapps/solr/WEB-INF/lib/antlr-runtime
>> - -3.5.jar
>> >
>> >  -rw-r--r-- 1 solr solr 167735 Feb 10 10:00
>> > /var/lib/solr/tomcat-deployment/webapps/solr/WEB-INF/lib/antlr-runtime
>> - -3.5.jar
>> >
>> >
>> Please let me have your feedback on this.
>>
>> You also need to make sure that every directory from the root has
>> "execute" privileges for the effective Tomcat user.
>>
>> This looks like a different issue than you originally reported. Has
>> that other issue gone away? Or is this the root cause of the
>> originally-reported issue?
>>
>> - -chris
>> -----BEGIN PGP SIGNATURE-----
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>> =cCGU
>> -----END PGP SIGNATURE-----
>>
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>

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