Cannot invoke "java.net.URL.toExternalForm()" because "location" is null

[techlifelk]

I get the following exception

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null

My code is

     java.net.URL auth = getClass().getResource("auth.jpg");
    Icon auth1 = new ImageIcon(auth);
    java.net.URL alert = getClass().getResource("alert.jpg");
    Icon alert1 = new ImageIcon(alert);
    java.net.URL insuf = getClass().getResource("insuf.jpg");
    Icon insuf1 = new ImageIcon(insuf);
    java.net.URL inva = getClass().getResource("inva.jpg");
    Icon inva1 = new ImageIcon(inva);
    URL see = getClass().getResource("see.jpg");
    Icon see1 = new ImageIcon(see);
    java.net.URL tap = getClass().getResource("tap.jpg");
    Icon tap1 = new ImageIcon(tap);
    java.net.URL wel = getClass().getResource("wel.jpg");
    Icon wel1 = new ImageIcon(wel);

[JamesCherrill]

It looks like your files are in the wrong place.
As used in your code, getResource will look for the files in same folder (or package if you are runnng from a jar) that the current class was loaded from. I don't see any class files in that directory.

It looks like you are using NetBeans?
If so, create a package called (eg) images in your project's Source Packages alongside the package containing your source code. Add all the image files to it. Reference them like getClass().getResource("/images/auth.jpg");
Netbeans will create the correct folder or jar struture for you and put things in the right place.

Here's an example

[techlifelk]

I still get the same issue

[techlifelk]

The thing is that i want to set images to my labels. I have located the images using the pallette but when i execute the jar in another machine it does not show the images.I wanted to fix it and saw that this is the approach but it does not work

[JamesCherrill]

Yes, this is the right way, and will work just fine when NetBeans puts it all in a Jar.
We need to see the full Stack trace from the exception, and the exact line of your code that it refers to.

[techlifelk]

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null
at java.desktop/javax.swing.ImageIcon.<init>(ImageIcon.java:217)
at com.mycompany.smarttraveller.Form.<init>(Form.java:73)
at com.mycompany.smarttraveller.Form$8.run(Form.java:625)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:316)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[JamesCherrill]

And what exactly is at com.mycompany.smarttraveller.Form.<init>(Form.java:73) (and the preceeding few lines)

ps (may be nothing)

at com.mycompany.smarttraveller.Form.<init>(Form.java:73)
at com.mycompany.smarttraveller.Form$8.run(Form.java:625)

that seems a bit odd. Form$8 is an anonymous inner class of Form, but it seems to be ceating a new instance of Form.
Is that what you intended?

[techlifelk]

Now it shows at 61

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null
at java.desktop/javax.swing.ImageIcon.<init>(ImageIcon.java:217)
at com.mycompany.smarttraveller.Form.initComponents(Form.java:405)
at com.mycompany.smarttraveller.Form.<init>(Form.java:61)
at com.mycompany.smarttraveller.Form$8.run(Form.java:625)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:316)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[JamesCherrill]

Its the other one, line 405, where the problem starts. What's on that?

[Manu_18]

This post has no text-based content.

[Dani]

Manu_18, can you show your code? Better yet, start a new topic and show your code and the error message. This way your question doesn't get lost inside a 2 year old topic.