Already imported the jar files in netbeans but my source cannot find the library

Question

I already imported the jar files in netbeans but my main java file still cannot find the methods. I am using netbeans 7.3.1 on Mac. Does anyone know how make it work?

Thank you,

Solution

I also had problem with importing classes from imported jar. It was so damn annoying...

There are couple solutions @ web, (clear cache in user's AppData. or make sure to add jar's properly - by using "Add Jar/Folder..." option) but none of them worked for me.

What worked was new project and importing THE SAME (that's sad) jar files into it. So I had 2 project with exactly the same contents, but only one of them was working (compiling).

EDIT: However, your problem is not related to mine. Root cause of your issue is the jar itself.

It contains class files in default package that is making them impossible to import.

Read here how to import class from default (unnamed) package.

Comments

[jax]

I am new to java environment. I added the stdlib.jar from project properties -> libraries ->compile -> add jar folder. For instance there is a StdIn.java in that library. I tried to import it using import StdIn.java; and it tells me StdIn.java does not exist.

[dantuch]

@arashaga try with import StdIn;

[dantuch]

where you get that jar from?

[Scott Barta]

Putting jar files inside your Java installation is a bad idea.

[user3217883]

What worked for me was to close NetBeans and re-open it.