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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: weblogic/security/providers/authentication/MyUse
rNameMapper (wrong name: MyUserNameMapper)	at java.lang.ClassLoader.defineClass0(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:502)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:250)	at java.net.URLClassLoader.access$100(URLClassLoader.java:54)	at java.net.URLClassLoader$1.run(URLClassLoader.java:193)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:186)	at java.lang.ClassLoader.loadClass(ClassLoader.java:299)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)	at java.lang.ClassLoader.loadClass(ClassLoader.java:292)	at java.lang.ClassLoader.loadClass(ClassLoader.java:255)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:140)	at weblogic.security.providers.authentication.DefaultIdentityAsserterProviderImpl.initialize(DefaultIdentityAsserterProviderImpl.java:115)	at weblogic.security.service.SecurityServiceManager.createSecurityProvider(SecurityServiceManager.java:1696)	at weblogic.security.service.PrincipalAuthenticator.initialize(PrincipalAuthenticator.java:158)	at weblogic.security.service.PrincipalAuthenticator.(PrincipalAuthenticator.java:260)	at weblogic.security.service.SecurityServiceManager.doATN(SecurityServiceManager.java:1481)	at weblogic.security.service.SecurityServiceManager.initializeRealm(SecurityServiceManager.java:1282)	at weblogic.security.service.SecurityServiceManager.loadRealm(SecurityServiceManager.java:1216)	at weblogic.security.service.SecurityServiceManager.initializeRealms(SecurityServiceManager.java:1338)	at weblogic.security.service.SecurityServiceManager.initialize(SecurityServiceManager.java:1018)	at weblogic.t3.srvr.T3Srvr.initializeHere(T3Srvr.java:783)	at weblogic.t3.srvr.T3Srvr.initialize(T3Srvr.java:627)	at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:337)	at weblogic.Server.main(Server.java:32)