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solr/server/contexts/solr-jetty-context.xml

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+<?xml version="1.0"?>
+<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_10_0.dtd">
+<Configure class="org.eclipse.jetty.webapp.WebAppContext">
+  <Set name="contextPath"><Property name="hostContext" default="/solr"/></Set>
+  <Set name="war"><Property name="jetty.base"/>/solr-webapp/webapp</Set>
+  <Set name="defaultsDescriptor"><Property name="jetty.base"/>/etc/webdefault.xml</Set>
+  <Set name="extractWAR">false</Set>
+
+  <!--
+  The rest of this file is necessary for us to deduplicate jetty server jars in our server build.
+  Jetty disallows "server" classes that are loaded via the server classloader (live in server/lib/ or server/lib/ext/)
+  from being used by the Webapp. Solr has a need for many of these classes, especially http and http2 for HTTP Client
+  libraries.
+
+  By default, Solr would need to duplicate these jars between server/lib/ and WEB-INF/lib/.
+  Therefore, if we want to deduplicate these Jetty jars, we need to remove the class packages that Solr uses from the
+  Jetty "server" class matcher, using the "-" prefix in from of the sub-package name.
+
+  The default server class matcher can be found here:
+  https://github.com/eclipse/jetty.project/blob/jetty-10.0.12/jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebAppContext.java#L178
+
+  Setting parentLoaderPriority=true is also necessary in order to be able to use these classes from the server classloader.
+
+  Documentation for this can be found here: https://www.eclipse.org/jetty/documentation/jetty-10/old_docs/index.html#jetty-classloading
+  -->
+  <Set name="parentLoaderPriority">true</Set>
+  <Call name="addServerClassMatcher">
+    <Arg>
+      <New id="removeServerClasses" class="org.eclipse.jetty.webapp.ClassMatcher">
+        <Arg>
+          <Array type="java.lang.String">
+            <Item>-org.eclipse.jetty.</Item>
+          </Array>
+        </Arg>
+      </New>
+    </Arg>
+  </Call>
+</Configure>