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07: HATEOAS RESTFul Service with Spring tutorial

Step 1: Create a Maven project structure

mvn archetype:generate -DgroupId=com.mytutorial -DartifactId=simpleSpringRestWeb -DarchetypeArtifactId=maven-archetype-webapp

1	mvn archetype:generate -DgroupId=com.mytutorial -DartifactId=simpleSpringRestWeb -DarchetypeArtifactId=maven-archetype-webapp

Step 2: pom.xml to get right jars

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mytutorial</groupId>
    <artifactId>simpleSpringRestWeb</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>simpleSpringRestWeb</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <scope>provided</scope>
            <version>2.1.3</version>
        </dependency>
        <dependency>
            <groupId>xml-apis</groupId>
            <artifactId>xml-apis</artifactId>
            <scope>provided</scope>
            <version>1.0.b2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
            <version>3.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.logback-extensions</groupId>
            <artifactId>logback-ext-spring</artifactId>
            <version>0.1.1</version>
        </dependency>
         <dependency>
            <groupId>org.springframework.hateoas</groupId>
            <artifactId>spring-hateoas</artifactId>
             <version>0.17.0.RELEASE</version>
        </dependency>
         <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-joda</artifactId>
            <version>2.3.2</version>
        </dependency>

    </dependencies>
</project>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<groupId>com.mytutorial</groupId>

<artifactId>simpleSpringRestWeb</artifactId>

<version>1.0-SNAPSHOT</version>

<name>simpleSpringRestWeb</name>

<url>http://maven.apache.org</url>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

</dependency>

<scope>provided</scope>

</dependency>

<scope>provided</scope>

</dependency>

<groupId>javax.servlet</groupId>

<artifactId>javax.servlet-api</artifactId>

<scope>provided</scope>

</dependency>

<groupId>org.logback-extensions</groupId>

<artifactId>logback-ext-spring</artifactId>

</dependency>

<groupId>org.springframework.hateoas</groupId>

<artifactId>spring-hateoas</artifactId>

<version>0.17.0.RELEASE</version>

</dependency>

<groupId>com.fasterxml.jackson.datatype</groupId>

<artifactId>jackson-datatype-joda</artifactId>

</dependency>

</dependencies>

</project>

Note that “spring-hateoas” is included. The “com.fasterxml.jackson.datatype” is required for the JSON processing. Step 3: Hello class with “ … Read more ›...

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07: Java 8 API examples using lambda expressions and functional programming

Java 8 API examples using lambda expressions and functional programming. Example 1: The java.lang.Runnable interface has been made a functional interface.

package com.java8.examples;

public class Example1 {
 
 public static void main(String[] args) {
   System.out.println("main thread: " + Thread.currentThread().getName());
   
   //run method takes no arguments so: () -> (body)
   //closure worker thread1
   Runnable r = () -> (System.out.println("worker thread: " + Thread.currentThread().getName())); 
   new Thread(r).start(); //pass the Runnable closure to Thread constructor
   
   //closure worker thread2
   new Thread( () -> (System.out.println("worker thread: " + Thread.currentThread().getName()))).start(); 
 }
}

package com.java8.examples;

public class Example1 {

public static void main(String[] args) {

System.out.println("main thread: " + Thread.currentThread().getName());

//run method takes no arguments so: () -> (body)

//closure worker thread1

Runnable r = () -> (System.out.println("worker thread: " + Thread.currentThread().getName()));

new Thread(r).start(); //pass the Runnable closure to Thread constructor

//closure worker thread2

new Thread( () -> (System.out.println("worker thread: " + Thread.currentThread().getName()))).start();

}

Output: main thread: main worker thread: Thread-0 worker thread: Thread-1 Example 2: The java.util.function package has a number of functional interfaces. … Read more ›...

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07: Java FP – CompletableFuture monadic chaining with examples – part 1

This extends Future Vs. CompletableFuture interview Q&As with Java 8 functional programming (i.e. FP). Q1. Why was CompletableFuture introduced in Java 8 when you already had the Future interface? A1. The CompletableFuture implements both CompletionStage<T> and Future<T> … Read more ›...

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07: Java Iterable Vs Iterator differences and know how

Q1. What are the differences between Iterator<T> Vs Iterable<T>?
A1. The “Iterable” was introduced to be able to use in the “foreach” loop. A class implementing the Iterable interface can be iterated over. For example,

public interface Collection<E> extends Iterable<E>

1	public interface Collection<E> extends Iterable<E>

Hence,

…

07: Java ThreadLocal Interview questions & answers

Java ThreadLocal Interview questions & answers in detail with code focusing more on when to use it and how to not abuse it. Q1. What is a ThreadLocal class? When to use it? How to not abuse it? A1. … Read more ›...

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07: Q33 Top 5 OOP tips for Java developers

Tip #1: Tightly encapsulate your classes. A class generally contains data as well as methods, and is responsible for the integrity of its own data. The standard way to protect the data is to make it private, so that no other class can get direct access to it, … Read more...

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07: Reactive Programming or Reactor pattern (RP) in Java Interview Q&As

Q1. Explain “pull” vs “push” paradigms (aka imperative/interactive vs reactive) with respect to processing data in programming? A1. Interactive/imperative Programming (Pull): is all about asking for something and getting it in return. … Read more ›...

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07: When to use a ServletContextListener in Java EE? Understanding ServletContext and ServletContextListener with examples

A ServletContext object refers to the whole web application, whilst a ServletConfig is for a Servlet. Once an application is deployed onto the web application, ServletContextListener may be configured using annotations or the configuration file named web.xml. … Read more ›...

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08: 4 Java FP Monads interview Q&As with examples

Q01. What is a monad? A01. Monad is a wrapper (or a context) that flattens the result so that it can be further processed by mapping over each element. Everything that’s a monad is a functor with extra operation to flatten the results with “flatMap” … Read more ›...

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08: 7 basic Java Executor framework Interview Q&As with Future & CompletableFuture

Basic level Java Executor framework Interview Q&As with Future & CompletableFuture (introduced in Java 8), which you would be using very often in Java apps. Q01. What is an Executor Framework? A01.In Java 5, Executor framework was introduced with the java.util.concurrent. … Read more ›...

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08: CompletableFuture monadic chaining with examples – part 2

This extends Java FP – CompletableFuture monadic chaining with examples – part 1. f and g are processed asynchronously, and then combined A “Supplier” returns a result by taking nothing as an argument.

Supplier: () -> T

1 2	Supplier: () -> T

“CompletableFuture.supplyAsync” executes a “Supplier” without blocking. This means executes it asynchronously. … Read more ›...

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08: If Java did not have a stack or map, how would you ….

Q1 If Java did not have a Stack implementation, how would you go about implementing your own? A1 1) Determine the backing data structure (e.g. array, linked list, etc). 2) Determine the methods that need to be implemented like pop( ), … Read more ›...

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08: REST constraints (i.e. design rules) interview Q&A

Q1. What are the 6 REST constraints? A1. REST constraints are design rules that are applied to establish the distinct characteristics of the REST architectural style. These constraints don’t dictate what kind of technology to use, and they only define how data is transferred between components and what benefits we...

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Blog Archives

07: HATEOAS RESTFul Service with Spring tutorial

07: Java 8 API examples using lambda expressions and functional programming

07: Java FP – CompletableFuture monadic chaining with examples – part 1

07: Java Iterable Vs Iterator differences and know how

07: Java ThreadLocal Interview questions & answers

07: Q33 Top 5 OOP tips for Java developers

07: Reactive Programming or Reactor pattern (RP) in Java Interview Q&As

07: When to use a ServletContextListener in Java EE? Understanding ServletContext and ServletContextListener with examples

08: 4 Java FP Monads interview Q&As with examples

08: 7 basic Java Executor framework Interview Q&As with Future & CompletableFuture

08: CompletableFuture monadic chaining with examples – part 2

08: If Java did not have a stack or map, how would you ….

08: REST constraints (i.e. design rules) interview Q&A

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