Jalaj,
On 7/15/24 15:03, Jalaj Asher wrote:
Yeah I was wondering the same as this has been in place since a few
years now atleast 4 years since cachingAllowed had some changes in
tomcat 8 which was resulting in it caching all static content as well
as jsps and jars and our though process was if we have static content
being cached on the client end and jsps in the work folder each time
on access we don’t need the cache.
Does the cache actively hurt you?
Is there a way to cache just the jars and not every thing else in memory ?
I think the short answer is "no there is not a way to do this" but I may
be wrong.
The long answer might be "maybe, but you will have to play games with
<PreResources> and <PostResources> and maybe some other things to get it
working.
I would save yourself some complexity and simply enable caching.
-chris
-----Original Message-----
From: Christopher Schultz <ch...@christopherschultz.net>
Sent: Friday, July 12, 2024 4:02 PM
To: users@tomcat.apache.org
Subject: Re: Reg: tomcat CPU spikes
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Jalaj,
On 7/12/24 10:19, Jalaj Asher wrote:
Thank you Chuck and John for the responses.
Just a few points from the things you highlighted and wanted me to
check 1. unpackwar is set to true. I checked and was informed that we need
that to be true for a specific war file.
2. cachingAllowed=false. We keep it as false across the board.
Well... that'll do it. In order to locate resources, Tomcat needs to sift
through all of those JAR files every time. Scanning ZIP files is expensive.
You might want to reconsider this particular setting in your environment.
Also the reason I shared 2 different stacks is to highlight that the
problem does not occur post restart or with any specific part of the
application like the parser going in a loop but it kicks of at random
times impacting multiple tomcats. But all having the same stack
waiting on archiveresourceset and java.util.zip.
My only question would be "why is this only now coming to your attention?
Things should have been behaving this way .. for a long time.
I am working on getting both types of stacks to share here as well.
Had a question we just have one war file if unpack war is triggered
why should it impact loading jars from the entire webapp lib ?
Because WEB-INF/lib is full of JAR files that need to be scanned every tie you
try to load ... anything. Since you have disabled caching, it has to re-check
every file for every resource-load request.
-chris
-----Original Message-----
From: Chuck Caldarale <n82...@gmail.com>
Sent: Wednesday, July 10, 2024 6:19 PM
To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: Reg: tomcat CPU spikes
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eClinicalWorks. Always use caution when opening attachments, clicking links, or
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On Jul 10, 2024, at 17:02, Jalaj Asher <jalaj.as...@eclinicalworks.com.INVALID>
wrote:
Sharing another stack to see if this can give any more insights.this thread is
the tomcat main thread was loading about 65MB of data.
"main" #1 prio=5 os_prio=0
java.lang.Thread.State: RUNNABLE
at java.util.zip.ZipFile.getEntry(Native Method)
at java.util.zip.ZipFile.getEntry(ZipFile.java:328)
- locked <0x00000000a1b04418> (a java.util.jar.JarFile)
at java.util.jar.JarFile.getEntry(JarFile.java:253)
at java.util.jar.JarFile.getJarEntry(JarFile.java:236)
at
org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.getArchiveEntry(AbstractSingleArchiveResourceSet.java:97)
at
org.apache.catalina.webresources.AbstractArchiveResourceSet.getResource(AbstractArchiveResourceSet.java:249)
at
org.apache.catalina.webresources.StandardRoot.getResourceInternal(StandardRoot.java:272)
at
org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:213)
at
org.apache.catalina.webresources.StandardRoot.getClassLoaderResource(StandardRoot.java:220)
at
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2348)
at
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:875)
at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1376)
- locked <0x00000000f24fc728> (a java.lang.Object)
at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1220)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at
com.sun.beans.finder.ClassFinder.findClass(ClassFinder.java:67)
at
com.sun.beans.finder.ClassFinder.findClass(ClassFinder.java:110)
at
com.sun.beans.finder.InstanceFinder.instantiate(InstanceFinder.java:93)
at
com.sun.beans.finder.InstanceFinder.find(InstanceFinder.java:66)
at
java.beans.Introspector.findExplicitBeanInfo(Introspector.java:448)
at java.beans.Introspector.<init>(Introspector.java:398)
at java.beans.Introspector.getBeanInfo(Introspector.java:173)
at
org.springframework.beans.CachedIntrospectionResults.getBeanInfo(Cach
edIntrospectionResults.java:255)
Is there some configuration setting in Spring that would disable
caching? (I’m not really knowledgeable about Spring.)
There should be more in the stack trace that would show what’s triggering the
getBeanInfo() calls. Tomcat won’t be doing the lookup unless something asks for
it.
- Chuck
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