Could not initialize class javax.imageio.ImageIO

Question

I\'m trying to deploy a Spring web app to a Tomcat 7 running on a production environment on Windows Azure (tried Ubuntu and Windows Datacenter VM). Sadly, I get an error whi

Answer 1

I have tomcat 8.5 and used it with log4j as a general logger. I changed the tomcat-juli.jar in the $CATALINA_Home/bin directory. and I got this error. I changed to the original tomcat-juli.jar ( a link ../../java/tomcat8-juli.jar) and it worked again !

Answer 2

Got fixed for me by adding following JVM option.

JAVA_OPTS="-Djava.awt.headless=true -Dawt.toolkit=sun.awt.HToolkit"

Answer 3

Ok so I fixed this issue =)

1. I removed OpenJDK from Linux distribution and installed Oracle Java 7 > u25 by hand. (Good tutorial: http://de.wikihow.com/Installation-von-Oracle-Java-unter-Ubuntu-Linux)

2. Then I added an ApplicationListener which loads the sunToolkit by hand (because AppContext is always null for some reason)

   @SuppressWarnings("restriction")
   public class ContextConfiguration implements ApplicationListener<ContextRefreshedEvent> {
       @Override
       public void onApplicationEvent(ContextRefreshedEvent arg0) {
           //refresh awt context
           if(AppContext.getAppContext() == null) {
               SunToolkit.createNewAppContext();
           }
       }
   }
   

Thanks at haraldK =)