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Aug 31, 2015 3:06:08 PM com.vaadin.server.DefaultErrorHandler doDefault
SEVERE:
java.lang.NoClassDefFoundError: com/google/common/eventbus/SubscriberExceptionHandler
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2472)
    at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:854)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1274)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157)
    at info.chrismcgee.sky.scheduling.SchedulingUI.<init>(SchedulingUI.java:48)

private final SchedulingEventBus schedulingEventbus = new SchedulingEventBus();

package info.chrismcgee.sky.event;

import info.chrismcgee.sky.scheduling.SchedulingUI;

import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.SubscriberExceptionContext;
import com.google.common.eventbus.SubscriberExceptionHandler;

/**
 * A simple wrapper for Guava event bus. Defines static convenience methods for
 * relevant actions.
 *
 * @author Marketing
 *
 */
public class SchedulingEventBus implements SubscriberExceptionHandler {

    private final EventBus eventBus = new EventBus(this);

    public static void post(final Object event) {
        SchedulingUI.getSchedulingEventbus().eventBus.post(event);
    }

    public static void register(final Object object) {
        SchedulingUI.getSchedulingEventbus().eventBus.register(object);
    }

    public static void unregister(final Object object) {
        SchedulingUI.getSchedulingEventbus().eventBus.unregister(object);
    }

    @Override
    public void handleException(final Throwable exception,
            final SubscriberExceptionContext context) {

        exception.printStackTrace();
    }

}