How does this work, and where does the container come from? Spring's SpringServletContainerInitializer will automatically detect any implementation of WebApplicationInitializer and use it, providing the servlet context. We will implement Spring's WebAppInitializer interface to configure our servlet: Here we will use Java configuration to replace those. This would traditionally be done in web.xml and a context.xml file. Now that we have a Tomcat instance up and running, the next step is to tell it about our servlet. Next we need to create a launcher class with a main method that will serve as our JAR entry point, and start Tomcat (code below is based on this nice example from Heroku): One for embedded Tomcat, and one for Spring Web MVC: Embedded Tomcat 5.5 The same principles apply to any other framework as well.įirst, let's setup our Maven dependencies. We will use Spring web-mvc (without Boot) to illustrate the concept. But if you are not using such a framework, or don't want to use those features of it, here is how to do it manually. Some frameworks can do this for you automatically, like Spring Boot. This may not be a good option if your app is composed of several servlets, because each one will have a duplicate server embedded. How To Run Embedded Tomcat with Maven, Maven has a tomcat plugin that allows us to run an embedded tomcat instance without the need of Include the Tomcat Maven Plugin as shown in the following POM example.Ĭreating a runnable server jar can be a great option if you want an easily portable and deployable app. Maven - Using tomcat-maven-plugin to deploy war file to Tomcat server. There is no need to setup or configure anything else! This jar file can then be moved to any platform with a JVM and run with a simple java -jar myServlet.jar. In this article we will see how to create a self-contained Java servlet as runnable jar (a fat jar).
Maven Embedded Tomcat 8 Example Program.
That’s the version we want.Ĭhange your pom.xml in the following way: On the other hand, shows that the latest version at the moment of this It hasn’t been updated for a while, the latest version being 2.2 which Solution: Update your Tomcatīut how do you update your Tomcat? Its information So I needed to upgrade my Tomcat maven plugin. When I added dependencies for log4j2 (versionĢ.11.0) to my project, I got the error: .:Īpparently, log4j2 is a multi-release jar and older versions of TomcatĬan’t handle that. I use tomcat7-maven-plugin to spin up a Tomcat 7 container where I can Tomcat7 Maven Plugin Invalid Byte Tag in Constant Pool 19
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