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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: org/eclipse/osgi/baseadaptor/HookConfigurator	at java.lang.ClassLoader.findBootstrapClass(Native Method)	at java.lang.ClassLoader.findBootstrapClass0(ClassLoader.java:892)	at java.lang.ClassLoader.loadClass(ClassLoader.java:302)	at java.lang.ClassLoader.loadClass(ClassLoader.java:300)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:169)	at org.eclipse.osgi.baseadaptor.HookRegistry.loadConfigurators(HookRegistry.java:176)	at org.eclipse.osgi.baseadaptor.HookRegistry.initialize(HookRegistry.java:100)	at org.eclipse.osgi.baseadaptor.BaseAdaptor.(BaseAdaptor.java:96)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)	at org.eclipse.core.runtime.adaptor.EclipseStarter.createAdaptor(EclipseStarter.java:751)	at org.eclipse.core.runtime.adaptor.EclipseStarter.startup(EclipseStarter.java:282)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:175)	at org.eclipse.core.runtime.adaptor.EclipseStarter.main(EclipseStarter.java:150)