title: Spring Boot: Deploy WAR on Tomcat 7
body: <p>I have developed a webapp with Spring Boot and generated the WAR. 
  I have followed <a href="https://docs.spring.io/spring-boot/docs/current/reference/html/howto-traditional-deployment.html" rel="noreferrer">this</a> instructions before generate the war. I'm deploying it in a Tomcat 7.0.52 but I get this:</p>
  
  <blockquote>
    <p>INFO:
    validateJarFile(/opt/devel/server/apache-tomcat-7.0.52/webapps/myapp/WEB-INF/lib/tomcat-embed-el-8.0.32.jar)
    - jar not loaded. See Servlet Spec 3.0, section 10.7.2. Offending class: javax/el/Expression.class
    2016-04-19 11:48:28.579  WARN 27983 --- [io-8080-exec-14] org.apache.catalina.deploy.WebXml        : Unknown version string [3.1]. Default version will be used.</p>
  </blockquote>
  
  <p>I thought it was due to servlet spec version, but in the link above says that it supports 3.0 as well as 3.1 (Tomcat 8). If I deploy my app in a Tomcat 8, everything works.</p>
  
  <p>Thanks.</p>