I don’t know about your most recent stack trace, but the first one had this
frame:
at javax.xml.parsers.FactoryFinder$1.run(FactoryFinder.java:293)
What’s the rest of the stack trace? I suspect you’re recreating a SAX parser
or parser factory over and over. The intent of those factories is that you
initialize them once and reuse them. Recreate the document builder,
transformer, parser, etc as necessary, but don’t recreate the factory. The
java service loader is very expensive. If you’re doing it dozens or hundreds
of times a second, that can definitely chew up your CPU.
Thanks
From: Jalaj Asher <jalaj.as...@eclinicalworks.com.INVALID>
Sent: Wednesday, July 10, 2024 5:02 PM
To: users@tomcat.apache.org
Subject: RE: Reg: tomcat CPU spikes
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)
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(CachedIntrospectionResults.java:255)
Regards
Jalaj
From: Jalaj Asher
Sent: Wednesday, July 10, 2024 4:19 PM
To: users@tomcat.apache.org<mailto:users@tomcat.apache.org>
Subject: Reg: tomcat CPU spikes
Hello,
We are using tomcat version 9.0.80.
We are seeing intermittent CPU spikes with the requests having the following
stack and it is also causing disk spikes on our end because of this call stack .
at java.util.zip.ZipFile.getEntry(Native Method)
at java.util.zip.ZipFile.getEntry(ZipFile.java:328)
- locked <0x00000000bb4fbf08> (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.getResourcesInternal(StandardRoot.java:316)
at
org.apache.catalina.webresources.StandardRoot.getResources(StandardRoot.java:307)
at
org.apache.catalina.webresources.StandardRoot.getClassLoaderResources(StandardRoot.java:226)
at
org.apache.catalina.loader.WebappClassLoaderBase.findResources(WebappClassLoaderBase.java:1009)
at
org.apache.catalina.loader.WebappClassLoaderBase.getResources(WebappClassLoaderBase.java:1110)
at java.util.ServiceLoader$LazyIterator.hasNextService(ServiceLoader.java:348)
at java.util.ServiceLoader$LazyIterator.hasNext(ServiceLoader.java:393)
at java.util.ServiceLoader$1.hasNext(ServiceLoader.java:474)
at javax.xml.parsers.FactoryFinder$1.run(FactoryFinder.java:293)
at java.security.AccessController.doPrivileged(Native Method)
these are the runnable threads.
Wanted to get some understanding to see when does tomcat access the
archiveresourceset and why is it calling getjarentry and zip file entry and any
suggestions to address this issue ?
Would appreciate any help with this review.
Regards
Jalaj
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