NoClassDefFoundError pops out of nowhere

[Flimm]

I'm trying to learn iText (http://itextpdf.com), so I created a small file named PDFTest.java:

import com.itextpdf.text.pdf.*;

public class PDFTest
{

public static void main(String args[]) throws java.io.IOException
{
PdfReader reader = new PdfReader("/home/user/Documents/test.pdf");
System.out.println("number of pages: " + reader.getNumberOfPages());
}
}
I compile the file using:
javac -cp iText.jar PDFTest.java
It compiles successively, but I get this error when I try to run the result:

$ java PDFTest
Exception in thread "main" java.lang.NoClassDefFoundError: com/itextpdf/text/pdf/PdfReader
at PDFTest.main(PDFTest.java:8)
Caused by: java.lang.ClassNotFoundException: com.itextpdf.text.pdf.PdfReader
at java.net.URLClassLoader$1.run(URLClassLoader.java: 200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 07)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 52)
at java.lang.ClassLoader.loadClassInternal(ClassLoade r.java:320)
... 1 more
I'm using java-6-sun (Ubuntu 9.10) and the latest version of iText library (5.0.0) downloaded from the site. Any idea on what's gone wrong?

[Zugzwang]

When running, you need to add the library to the class path as well:


java -cp iText.jar PDFTest

[Flimm]

When running, you need to add the library to the class path as well:


java -cp iText.jar PDFTest

Thanks, I didn't think of that.
Unfortunately, that's not quite the solution, as I get this error:

$ java -cp iText.jar PDFTest
Exception in thread "main" java.lang.NoClassDefFoundError: PDFTest
Caused by: java.lang.ClassNotFoundException: PDFTest
at java.net.URLClassLoader$1.run(URLClassLoader.java: 200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 07)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 52)
at java.lang.ClassLoader.loadClassInternal(ClassLoade r.java:320)
Could not find the main class: PDFTest. Program will exit.

Turns out, I need to include the current directory. This works perfectly:
$ javac -cp .:iText.jar PDFTest.java
$ java -cp .:iText.jar PDFTest
number of pages: 2
$