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java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet	at java.lang.ClassLoader.defineClass0(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:493)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)	at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:143)	at java.lang.ClassLoader.loadClass(ClassLoader.java:299)	at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:112)	at java.lang.ClassLoader.loadClass(ClassLoader.java:255)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)