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I have a Tomcat application which needs to reference some properties files that are external to the app. Generally these are stored on a local machine at a specific place like C:\PROJECT_NAME\conf\.
In Tomcat 7 this was achievable by placing a context.xml file inside of /META-INF/ which used a VirtualWebappLoader to essentially add this location to the application classpath as follows:
<Context> <Loader className="org.apache.catalina.loader.VirtualWebappLoader" virtualClasspath="/PROJECT_NAME/conf" searchVirtualFirst="true" /> </Context> How do I achieve this same thing in Tomcat 8?
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A classpath is an argument that tells the JVM where to find the classes and packages necessary to run a program. The classpath is always set from a source outside the program itself.
Like many server applications, Tomcat installs a variety of class loaders (that is, classes that implement java. lang. ClassLoader ) to allow different portions of the container, and the web applications running on the container, to have access to different repositories of available classes and resources.
you can upload the . jar's to /home/tomcat/lib, which is mentioned in this doc. /home/tomcat/lib is added to Tomcat's class loader, so the . jar will be added just like when you put it under CATALINA_HOME/lib."
There is a section about this in the Tomcat 8 migration guide which will direct you to use a resources configuration
In particular, you will be creating a WebResourceRoot object which contains the following text in its description.
VirtualWebappLoader - Replaced by Pre- and Post-Resources mapped to WEB-INF/lib and WEB-INF/classes
Your new context.xml will look something like the following:
<Context> <Resources className="org.apache.catalina.webresources.StandardRoot"> <PreResources className="org.apache.catalina.webresources.DirResourceSet" base="C:\\PROJECT_NAME\\conf" internalPath="/" webAppMount="/WEB-INF/classes" /> </Resources> </Context> Just another example:
Please note the comments inside and note that I used PostResources and not PreResources so that I can override classes in my current project if I'm not happy with my "util" implementation. I'm not actually sure if JarResource is treated as a "PostResource" or "PreResource" but overriding static content and classes works.
<!-- https://tomcat.apache.org/tomcat-8.0-doc/config/resources.html http://stackoverflow.com/questions/23143697/adding-external-resources-to-class-path-in-tomcat-8 http://stackoverflow.com/questions/34515852/tomcat-7-application-migration-to-tomcat-8 http://mikusa.blogspot.co.za/2014/07/tips-on-migrating-to-tomat-8-resources.html --> <Context path="/MY_PROJECT" docBase="/MY_PROJECT"> <Resources className="org.apache.catalina.webresources.StandardRoot"> <!-- Post-load the static content from my util project --> <PostResources className="org.apache.catalina.webresources.DirResourceSet" base="/workspace/MY_UTIL_PROJECT/WebContent" webAppMount="/"> </PostResources> <!-- Post-load the classes from my util project --> <PostResources className="org.apache.catalina.webresources.DirResourceSet" base="/workspace/MY_UTIL_PROJECT/WebContent/WEB-INF/classes" webAppMount="/WEB-INF/classes"> </PostResources> <!-- Load the JARs contained within my util project --> <JarResources className="org.apache.catalina.webresources.DirResourceSet" base="/workspace/MY_UTIL_PROJECT/WebContent/WEB-INF/lib" webAppMount="/WEB-INF/lib"> </JarResources> </Resources> </Context> If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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