将Java项目导出为可运行的Jar：不执行任何操作

Question

So I have a problem with exporting my eclipse project. The project works perfectly when running it inside eclipse, but when exporting it, it doesn't do anything.

I can't post a third link since I have less than 10 reputation, but in there I chose my "main" as launch configuration, and "package required libraries.

When I double click the runnable Jar nothing happens, nothing pops up.. No message nothing. When I run it using java -jar smergy.jar I receive

`C:\Users\Jean>java -jar Smergy.jar
java.lang.NullPointerException
        at javax.swing.ImageIcon.<init>(Unknown Source)
        at smergy.SmergyMain.<init>(SmergyMain.java:162)
        at smergy.SmergyMain$1.run(SmergyMain.java:50)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$500(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionP
rivilege(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)`

Answer 1

Most likely the images are not being packaged into the jar. Or they are not being loaded. One way to deal with loading resources is using the Toolkit like this: setIconImage(Toolkit.getDefaultToolkit().getImage(getClass().getResource("/package1/package2/dump.jpg")));