https://bz.apache.org/bugzilla/show_bug.cgi?id=61212
Bug ID: 61212
Summary: Slow application boot time due to constant jar file
content read
Product: Tomcat 8
Version: 8.5.15
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ----
Created attachment 35071
--> https://bz.apache.org/bugzilla/attachment.cgi?id=35071&action=edit
Profile Before
We do have relativelly big spring based application with ~250mb of jars.
After migrating from tc 7 to tc 8 application boot time significantly
increased. Seems that most of the time is taken by a constant call to
java.util.jar.JarFile.getJarEntry.
Looks like tc8 class/resource loaded on each ClassLoader.loadClass(String)
iterates throught all jars and asked each jar if resource exists instead of
caching jar content once in memmory.
tc 8 has the ability to read jar contens only once but to enable it we had to
extend org.apache.catalina.webresources.StandardRoot iwth custom
implementation.
After change total time spent on
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(String) dropped from
87sec to 39sec. It was 40+sec of time wasted on constant jar content check.
package org.apache.catalina.webresources;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.WebResourceSet;
/**
* Created by adi on 09/06/2017.
*/
public class CustomStandardRoot extends
org.apache.catalina.webresources.StandardRoot {
@Override
protected void startInternal() throws LifecycleException {
super.startInternal();
for (WebResourceSet webResourceSet : getClassResources()) {
if (webResourceSet instanceof AbstractArchiveResourceSet) {
// Load Jar Content into Memory
((AbstractArchiveResourceSet)webResourceSet).getArchiveEntries(false);
}
}
}
}
and register custom implementation in TOMCAT_HOME/conf/context.xml
<?xml version="1.0" encoding="UTF-8"?>
Context containerSciFilter="org.apache.tomcat.websocket.server.WsSci">
...
<Resources cachingAllowed="true"
className="org.apache.catalina.webresources.CustomStandardRoot"/>
...
</Context>
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