title: .NoClassDefFoundError when trying to use pdfBox
body: <p>when I try to use one of the <code>PDFBox</code> examples for extracting images, in the run time,it gives me the following exception:</p>
  
  <pre><code>   Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
      at org.apache.pdfbox.pdfparser.BaseParser.&lt;clinit&gt;(BaseParser.java:68)
      at org.apache.pdfbox.pdmodel.PDDocument.load(PDDocument.java:1218)
      at org.apache.pdfbox.pdmodel.PDDocument.load(PDDocument.java:1186)
      at org.apache.pdfbox.pdmodel.PDDocument.load(PDDocument.java:1111)
      at pdfboxtest.PdfBoxTest.extractImage(PdfBoxTest.java:69)
      at pdfboxtest.PdfBoxTest.main(PdfBoxTest.java:53)
  Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
      at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
      at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
      ... 6 more
  </code></pre>
  
  <p>here is the part of the code that exception occurs, at the last two lines:</p>
  
  <pre><code>         String pdfFile = "pdf file path";
           File pdf=new  File(pdfFile);
           PDDocument document = null;
           document = PDDocument.loadNonSeq(pdf, null, password);
           document = PDDocument.load( pdfFile );
  </code></pre>