java.lang.NoClassDefFoundError: This exception has no message.

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org.apache.http.config.Lookup class is in httpcore-4.3.jar not in httpclient-4.3.1.jar

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java.lang.NoClassDefFoundError:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:115)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:53)
at sun.awt.motif.MToolkit.(MToolkit.java:52)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:115)
at java.awt.Toolkit$2.run(Toolkit.java:507)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:498)
at javax.swing.ImageIcon.(ImageIcon.java:115)
at java.lang.Thread.run(Thread.java:479)

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