Java SE (Java Platform, Standard Edition)

I know this message has been ask a few times already, but none of the answers worked for me.

I created a Java application in Netbeans. I want to remove the Java logo in the JFrame title bar. I tried it with setIconImage(......), I put it in a try-catch block. When I ran the app, no exception where thrown, but the image of the JFrame hasn't changed. Is there any other way to change or remove the logo-icon in the title bar??

I thought of deleting/changing the default logo. The default logo (I think) should be located in either the netbeans or the jdk folder. Does anyone know where the java logo is located (and if it is a .ico or .png or etc..), and if it will work???

I appreciate any suggestions!!