How to connect to the SDL Tridion 2011 core services client using JAVA?

1. Create a new folder under your source project
2. Open a terminal window and go to the JDK\bin folder
3. Type the following ws-import command:
   wsimport -extension -keep -Xnocompile -d {location of the source folder} {Webservice URL}
   
   
4. Create the authenticator class:
   import java.net.Authenticator;
   import java.net.PasswordAuthentication;
   
   public class BasicHttpAuthenticator extends Authenticator {
   
      private String user;
      private String password;
   
      public BasicHttpAuthenticator(String user, String password) {
         this.user = user;
         this.password = password;
      }
   
      @Override
      protected PasswordAuthentication getPasswordAuthentication() {
         return new PasswordAuthentication(user, password.toCharArray());
      }
   }
   
   
5. Create the web service client class:
   
   import java.net.Authenticator;
   import java.net.URL;
   
   import javax.xml.namespace.QName;
   
   import com.sdltridion.contentmanager.coreservice._2011.CoreService2011;
   import com.sdltridion.contentmanager.coreservice._2011.ICoreService;
   import com.sdltridion.contentmanager.r6.UserData;
   
   public class Main {
      private static final QName Q_NAME = new QName("http://www.sdltridion.com/ContentManager/CoreService/2011", "CoreService2011");
   
      public static void main(String[] args) throws Exception {
         BasicHttpAuthenticator basicHttpAuthenticator = new BasicHttpAuthenticator({user}, {password});
         Authenticator.setDefault(basicHttpAuthenticator);
   
         URL url = new URL({Webservice URL});
         CoreService2011 service = new CoreService2011(url, Q_NAME);
         ICoreService client = service.getBasicHttp();
   
         UserData currentUser = client.getCurrentUser();
         System.out.println(String.format("'%s' %s",
         currentUser.getTitle().getValue(), currentUser.getId()));
   }

{user} is an account with access to the CMS
{password} is the account password
{Webservice URL} is the core service URL

Example:

Java version used for this project is Java 1.8.0_66-b17

{user}: administrator
{password}: h}S<77Sn
{Webservice URL}: http://www.blogger.com/webservices/CoreService2011.svc?singleWsdl
{location of the source folder}
     Windows: C:\source\CoreService2011\src
     Linux: /source/CoreService2011/src
JDK\bin folder: the default locations are
     Windows 64-bits: C:\Program Files\Java\jdk1.8.0_66\bin
     Linux: /usr/lib/jvm/java-8-oracle/bin

Structure of the project:
src
+--- BasicHttpAuthenticator.java
+--- Main.java

wsimport -extension -keep -Xnocompile -d /source/CoreService2011/src http://www.blogger.com/webservices/CoreService2011.svc?singleWsdl

import java.net.Authenticator;
import java.net.PasswordAuthentication;

public class BasicHttpAuthenticator extends Authenticator {

   private String user;
   private String password;

   public BasicHttpAuthenticator(String user, String password) {
      this.user = user;
      this.password = password;
   }

   @Override
   protected PasswordAuthentication getPasswordAuthentication() {
      return new PasswordAuthentication(user, password.toCharArray());
   }
}

import java.net.Authenticator;
import java.net.URL;

import javax.xml.namespace.QName;

import com.sdltridion.contentmanager.coreservice._2011.CoreService2011;
import com.sdltridion.contentmanager.coreservice._2011.ICoreService;
import com.sdltridion.contentmanager.r6.UserData;

public class Main {
   private static final QName Q_NAME = new QName("http://www.sdltridion.com/ContentManager/CoreService/2011", "CoreService2011");

   public static void main(String[] args) throws Exception {
      BasicHttpAuthenticator basicHttpAuthenticator = new BasicHttpAuthenticator("administrator", "h}S<77Sn");
      Authenticator.setDefault(basicHttpAuthenticator);

      URL url = new URL("http://www.blogger.com/webservices/CoreService2011.svc?singleWsdl");
      CoreService2011 service = new CoreService2011(url, Q_NAME);
      ICoreService client = service.getBasicHttp();

      UserData currentUser = client.getCurrentUser();
      System.out.println(String.format("'%s' %s", currentUser.getTitle().getValue(), currentUser.getId()));
   }
}

Source: http://yatb.mitza.net/2012/12/a-core-service-java-client.html