SYS-CON MEDIA Authors: Elizabeth White, Liz McMillan, Yeshim Deniz, Roger Strukhoff, Jason Bloomberg

Article

Revisitng Java SE 6 Features! @CloudExpo #Java #Cloud #OpenSource

A tutorial series on Java as we all eagerly await the official release of Java SE 9

I have provided some of the most important core language enhancements for JDK 6.0, along with code samples. The examples provided below can be directly pasted into your IDE and you may name the class as provided.

Integrated Web Services
From JDK6, Java allows the creation, publishing and lookup of web services through a mixture of annotations and command-line utilities. The below is located in package 'jdk6.features'
 package jdk6.features;  
 import javax.jws.WebMethod;  
 import javax.jws.WebService;  
 import javax.xml.ws.Endpoint;  

 /**  
  * @author sumith_puri  
  *  
  * credits: https://weblogs.java.net/blog/vivekp/archive/2006/12/webservices_in.html  
  *   
  * apt -d sample jdk6_WebServices.java  
  * java -cp sample jdk6.features.jdk6_WebServices  
  * wsimport -p client -keep http://localhost:8080/calculator?wsdl  
  */  
 @WebService  
 public class jdk6_WebServices {  
      @WebMethod  
      public int add(int a, int b) {  
           return (a+b);  
      }  
      public static void main(String[] args) {  
           jdk6_WebServices calculator = new jdk6_WebServices();  
           Endpoint endpoint = Endpoint.publish("http://localhost:8080/calculator", calculator);  
      }  
 }  

In the same folder as the root of the above source file/package, you should type the following:
apt -d sample jdk6_WebServices.java

Then type the following, to deploy the Web Service at the specified URL.
java -cp sample jdk6.features.jdk6_WebServices

Now, it is time to create the client. You may use the following command to create the client stubs.
wsimport -p client -keep http://localhost:8080/calculator?wsdl

We can import the generated sources from the 'client' folder now to Eclipse. Using the imported client stubs, you can create client application using the following. Execute it either on command-line or from Eclipse (Run As > Java Application)
 package client;  

 public class JDK6WebServicesClientApp {  
      public static void main(String[] args) {          
           Jdk6WebServicesService service = new Jdk6WebServicesService();  
           Jdk6WebServices serviceProxy = service.getJdk6WebServicesPort();  
           int result = serviceProxy.add(12, 12);  
           System.out.println("Sum: " + result);  
      }  
 }  


Java Compiler API
A powerful feature in JDK6 that will be of really help to create artifacts such as plugins, filters, extensions for dynamic (customer based or client based) execution - is Dynamic Compilation using the Java Compiler API.
 public class jdk6_DynamicCompilation {  

      public static void main(String[] args) throws Exception {            
           System.out.println("Testing Dynamic Compilation....");  
           System.out.println("plugin\\Plugin.java");       
           String fileToStream = "plugin" + java.io.File.separator + "Plugin.java";  
           JavaCompiler javaCompiler = ToolProvider.getSystemJavaCompiler();                 
           FileOutputStream fileOutputStream = new FileOutputStream("errors.txt");  
           int compilationResult = javaCompiler.run(null, null, fileOutputStream,   
                                                          "-verbose", fileToStream);            
           System.out.println("Compilation Result..." + compilationResult);  
      }  
 }  

The following code should be provided under 'plugin'. You may name it as 'Plugin.java'
 package plugin;  
   
 public class Plugin {  
      public boolean filter(String data) {            
           boolean flag=false;  
           if(data.contains("fish")) {                 
                flag=true;  
           }  
           return flag;  
      }  
 
     public static void main(String[] args) {  
      }  
 }  

You may now run the jdk6_DynamicCompilation and obtain Plugin.class as dynamically compiled class under the 'plugin' folder.  Now execute the generated class either using reflection (which you may use in real-world products or solutions) or from the command-line.
java -cp . plugin.Plugin


Scripting Language Support
With JDK6, you may execute JavaScript (Tcl, Ruby, Groovy, etc.) from within Java. This is possible through ScriptingEngine. The example below shows the usage of JavaScript within Java.

 package jdk6.features;  
 import java.io.File;  
 import java.io.FileReader;  
 import javax.script.Invocable;  
 import javax.script.ScriptEngine;  
 import javax.script.ScriptEngineManager;  
   
 public class jdk6_Scripting {  
      public void todaysLogic() throws Exception {            
        // dynamically change script - invoke code in groovy, js - even tcl!  
        ScriptEngineManager manager = new ScriptEngineManager();  
        ScriptEngine jsEngine = manager.getEngineByName("JavaScript");  
        System.out.println(jsEngine.toString());  
        if (jsEngine instanceof Invocable) {  
             try {  
                  File file = new File("market.js");  
             } catch (Throwable e) {  
                  e.printStackTrace();  
             }              
             FileReader reader = new FileReader("market.js");              
             jsEngine.eval(reader);              
             ((Invocable) jsEngine).invokeFunction("current");  
         }  
      }  
      public static void main(String[] args) throws Exception {  
           jdk6_Scripting scripting = new jdk6_Scripting();  
           scripting.todaysLogic();  
      }  
 }  


You must place the following JavaScript code in your classpath, maybe within the root folder of your Eclipse Project. You should name it 'market.js'
 function current() {  
   var x = "", i;  
   for (i=0; i<100; i++) {  
        x="";  
        x = x + "The Number Is " + i;  
        println(x);  
   }    
 }  



Happy Programming with JDK6!

More Stories By Sumith Kumar Puri

Sumith Kumar Puri, an author (Java/JEE) at Packt Publishing, has close to 14 years of experience in entrepreneurship, conceptualization, architecture, design and development of software products and solutions. He also holds multiple certifications in Core Java, JEE, C, C++, Algorithms and Data Structures. He is an open source contributor and likes competitive programming and hackathons. He has 11 publications to his name in international and national conferences, journals and magazines. He is an active member of the IEEE/Computer Society, ACM and CSI.

He holds a Bachelor of Engineering [Information Science and Engineering] from Sri Revana Siddeshwara Institute of Technology, Bangalore, India. He has also completed the Executive Programme [Data Mining and Analytics] from the Indian Institute of Technology, Roorkee, India and the Executive Certificate Programme [Entrepreneurship] from the Indian Institute of Management, Kashipur, India. His current interests are in data mining, machine learning, Big Data and artificial intelligence. He is based out of Bangalore, India.

Latest Stories
Tapping into blockchain revolution early enough translates into a substantial business competitiveness advantage. Codete comprehensively develops custom, blockchain-based business solutions, founded on the most advanced cryptographic innovations, and striking a balance point between complexity of the technologies used in quickly-changing stack building, business impact, and cost-effectiveness. Codete researches and provides business consultancy in the field of single most thrilling innovative te...
Atmosera delivers modern cloud services that maximize the advantages of cloud-based infrastructures. Offering private, hybrid, and public cloud solutions, Atmosera works closely with customers to engineer, deploy, and operate cloud architectures with advanced services that deliver strategic business outcomes. Atmosera's expertise simplifies the process of cloud transformation and our 20+ years of experience managing complex IT environments provides our customers with the confidence and trust tha...
CloudEXPO has been the M&A capital for Cloud companies for more than a decade with memorable acquisition news stories which came out of CloudEXPO expo floor. DevOpsSUMMIT New York faculty member Greg Bledsoe shared his views on IBM's Red Hat acquisition live from NASDAQ floor. Acquisition news was announced during CloudEXPO New York which took place November 12-13, 2019 in New York City. Our Silicon Valley 2019 schedule will showcase 200 keynotes, sessions, general sessions, power panels, and...
With the introduction of IoT and Smart Living in every aspect of our lives, one question has become relevant: What are the security implications? To answer this, first we have to look and explore the security models of the technologies that IoT is founded upon. In his session at @ThingsExpo, Nevi Kaja, a Research Engineer at Ford Motor Company, discussed some of the security challenges of the IoT infrastructure and related how these aspects impact Smart Living. The material was delivered interac...
ShieldX's CEO and Founder, Ratinder Ahuja, believes that traditional security solutions are not designed to be effective in the cloud. The role of Data Loss Prevention must evolve in order to combat the challenges of changing infrastructure associated with modernized cloud environments. Ratinder will call out the notion that security processes and controls must be equally dynamic and able to adapt for the cloud. Utilizing four key factors of automation, enterprises can remediate issues and impro...
Intel is an American multinational corporation and technology company headquartered in Santa Clara, California, in the Silicon Valley. It is the world's second largest and second highest valued semiconductor chip maker based on revenue after being overtaken by Samsung, and is the inventor of the x86 series of microprocessors, the processors found in most personal computers (PCs). Intel supplies processors for computer system manufacturers such as Apple, Lenovo, HP, and Dell. Intel also manufactu...
Darktrace is the world's leading AI company for cyber security. Created by mathematicians from the University of Cambridge, Darktrace's Enterprise Immune System is the first non-consumer application of machine learning to work at scale, across all network types, from physical, virtualized, and cloud, through to IoT and industrial control systems. Installed as a self-configuring cyber defense platform, Darktrace continuously learns what is ‘normal' for all devices and users, updating its understa...
As you know, enterprise IT conversation over the past year have often centered upon the open-source Kubernetes container orchestration system. In fact, Kubernetes has emerged as the key technology -- and even primary platform -- of cloud migrations for a wide variety of organizations. Kubernetes is critical to forward-looking enterprises that continue to push their IT infrastructures toward maximum functionality, scalability, and flexibility. As they do so, IT professionals are also embr...
The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long development cycles that produce software that is obsolete at launch. DevOps may be disruptive, but it is essential. DevOpsSUMMIT at CloudEXPO expands the DevOps community, enable a wide sharing of knowledge, and educate delegates and technology providers alike.
At CloudEXPO Silicon Valley, June 24-26, 2019, Digital Transformation (DX) is a major focus with expanded DevOpsSUMMIT and FinTechEXPO programs within the DXWorldEXPO agenda. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throug...
Industry after industry is under siege as companies embrace digital transformation (DX) to disrupt existing business models and disintermediate their competitor’s customer relationships. But what do we mean by “Digital Transformation”? The coupling of granular, real-time data (e.g., smartphones, connected devices, smart appliances, wearables, mobile commerce, video surveillance) with modern technologies (e.g., cloud native apps, big data architectures, hyper-converged technologies, artificial in...
OpsRamp is an enterprise IT operation platform provided by US-based OpsRamp, Inc. It provides SaaS services through support for increasingly complex cloud and hybrid computing environments from system operation to service management. The OpsRamp platform is a SaaS-based, multi-tenant solution that enables enterprise IT organizations and cloud service providers like JBS the flexibility and control they need to manage and monitor today's hybrid, multi-cloud infrastructure, applications, and wor...
CloudEXPO has been the M&A capital for Cloud companies for more than a decade with memorable acquisition news stories which came out of CloudEXPO expo floor. DevOpsSUMMIT New York faculty member Greg Bledsoe shared his views on IBM's Red Hat acquisition live from NASDAQ floor. Acquisition news was announced during CloudEXPO New York which took place November 12-13, 2019 in New York City.
The Master of Science in Artificial Intelligence (MSAI) provides a comprehensive framework of theory and practice in the emerging field of AI. The program delivers the foundational knowledge needed to explore both key contextual areas and complex technical applications of AI systems. Curriculum incorporates elements of data science, robotics, and machine learning-enabling you to pursue a holistic and interdisciplinary course of study while preparing for a position in AI research, operations, ...
Codete accelerates their clients growth through technological expertise and experience. Codite team works with organizations to meet the challenges that digitalization presents. Their clients include digital start-ups as well as established enterprises in the IT industry. To stay competitive in a highly innovative IT industry, strong R&D departments and bold spin-off initiatives is a must. Codete Data Science and Software Architects teams help corporate clients to stay up to date with the mod...