Question

My program has the following lines, works fine when run from Netbeans,

JButton Button_1=new JButton(new ImageIcon(Phone_Dialer.class.getResource(“Dir_Icons/”+”Key_1″+Botton_Color+”.gif”)));

But when I run it from the resulting Jar file, this line caused “java.lang.NullPointerException” error, why ?

The dir is like this :

C:\Phone_Dialer\src\Phone_Dialer.java
C:\Phone_Dialer\src\Dir_Icons\Key_1_Silver.gif
C:\Phone_Dialer\dist\Phone_Dialer.jar

===========================================================================================
It’s definitely not the “Botton_Color” problem, It’s a string like this : “Silver” or “Pink”, so if I change the above line to “Dir_Icons\Key_1_Silver.gif“, it still works fine in the IDE while not be able to run from an executable Jar file, the problem seems to be : Why after jar the project, it can’t find the resources. The Jar file was generated by Netbeans, and is executable.

Answer 1

I got it, somehow the sound file suffix is in uppercase, now I changed them to lowercase and it’s working, thanks !