Hi
I'm analyzing a memory leak reported by Tomcat, and have narrowed it
down to org.apache.jasper.compiler.EncodingDetector:
private static final XMLInputFactory XML_INPUT_FACTORY;
static {
XML_INPUT_FACTORY = XMLInputFactory.newInstance();
}
This class is called by webapp code on a GET request
at
org.apache.jasper.compiler.EncodingDetector.<clinit>(EncodingDetector.java:38)
at
org.apache.jasper.compiler.ParserController.determineSyntaxAndEncoding(ParserController.java:324)
at
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:201)
at
org.apache.jasper.compiler.ParserController.parseDirectives(ParserController.java:128)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:207)
...
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:396)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
The EncodingDetector class, if not yet loaded, will be loaded in the
common classloader, then continue by loading the XMLInputFactory using
the webapp context, and might end up with a XMLInputFactory
implementation from a webapp-provided JAR. If that happens, the webapp
can't undeploy. (In my case, woodstox WstxInputFactory registers
itself as ServiceProvider for XMLInputFactory)
For completeness: javax.xml.stream.FactoryFinder.findServiceProvider()
is called without classloader (cl = null), and has
if (cl == null) {
//the current thread's context class loader
serviceLoader = ServiceLoader.load(type);
} else {
serviceLoader = ServiceLoader.load(type, cl);
}
I can't find anything online about memory leaks from webapp-provided
XMLInputFactory implementations, but this must be fairly common. Is my
understanding correct, or have I mis-configured something? (I'm mainly
wondering whether any XMLInputFactory-implementing JARs belong in
tomcat/lib, but again I'm not finding anything online confirming that)
Tomcat 10.1.19
JVM 17.0.10+7-Ubuntu-120.04.1
Ubuntu 20.04.6 LTS
Simon
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