How to add external resources to classpath in Tomcat 8?

Solution Verified - Updated -

Issue

  • How to add external resources to classpath in Tomcat 8?
  • What is replaced by VirtualWebappLoader in Tomcat8?
  • How to configure PreResources element in Tomcat8 server.xml?
  • Is it recommended to configure PreResources element in Tomcat8 server.xml?
  • When configuring the PreResources element as follow in Tomcat server.xml then accessing /docs context will throw HTTP 404 error but configuring the same in $CATALINA_HOME/conf/context.xml will works fine.Why?Is this is a bug?
 <Context path="/docs">
                    <Resources className="org.apache.catalina.webresources.StandardRoot">
                        <PreResources className="org.apache.catalina.webresources.DirResourceSet"
                                      base="/tmp"
                                      internalPath="/"
                                      webAppMount="/WEB-INF/classes"/>
                    </Resources>
</Context>

Environment

  • Red Hat JBoss Web Server (JWS) 3.0
    • Tomcat 8

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