I'm porting a webapp from Tomcat 7 to another server with Tomcat 7 but with Java 8. Tomcat starts successfully but in log catalina.out I get: org.apache.tomcat.util.bcel.classfile.ClassFormatExce...

Trying to Run Vaadin 8.1 app under Java 9 prerelease in IntelliJ 2017.2.2 I was able to build a vaadinjavanine.war using a fresh project and host the same using Jetty Server. I ended up trying to...

I tried upgrading to Java 8. When starting our tomcat7 server, with a Java 7-compiled .war file, I get the mysteriously error below. Should I expect this to work? This post says tomcat 7 sho...