Gain insights into Java 17, cloud and microservices, reactive programming, and top JVM languages. Explore hands-on projects using Scala, Groovy, and Gradle to boost your software development career.

Modern Java Second Edition by Adam L. Davis.png

file.tar.gz

modern_java

Groovy

Scala

Java 12

Java 14

Java 16

Java 17

Java 16-copy

Play

jshell

SPA-play

Gradle-uppercase

Gradle-copyimages

Gradle-properties

Java 14-copy

Java 16-fruits

Java 16-strings

Gradle-java

This course is meant for Java programmers or aspiring programmers who want to know about the latest Java and JVM technology. Throughout this course, you will get several opportunities to get hands-on experience with various Java concepts. 

This course will help you understand the latest in Java up to version 17; cloud and microservices; build, testing, and web frameworks; reactive programming in Java; and the best JVM languages so you can advance your career in software development. 

Moreover, you will also get to work with Scala, Groovy, and Gradle. The course explains Java concepts in detail and also draws comparisons with its older versions, as well as JVM languages.

The All-in-One Guide to Java Programming

Ratpack includes many test fixtures for aiding your unit, functional, and integration tests. It assumes
you’ll be using Spock to test your application.

First, if you’re using the ratpack gradle plugin, simply add the following dependencies:



```
dependencies {
  testCompile ratpack.dependency('test')
  testCompile "org.spockframework:spock-core:1.1-groovy-2.4"
  testCompile 'cglib:cglib:2.2.2'
  testCompile 'org.objenesis:objenesis:2.1'
}
```

The `cglib` and `objenesis` dependencies are needed for object mocking.

Second, add your Spock tests under the `src/test/groovy` directory using the same package structure as your main project. A simple test might look like the following:

```
package myapp.services
import spock.lang.Specification

class MyServiceSpec extends Specification {
    void "default service should return Hello World" () {
        setup: "Set up the service for testing"
        def service = new MyService()
        when: "Perform the service call"
        def result = service.doStuff()
        then: "Ensure that the service call returned the proper result"
        result == "Hello World"
        "Shutdown the service when this feature is complete"
        service.shutdown()
    }
}
```
Ratpack enables your functional tests by running your full application within a test environment
using `GroovyRatpackMainApplicationUnderTest`. For example, the following test would test the text
rendered by your default handler:
```
package myapp
import ratpack.groovy.test.GroovyRatpackMainApplicationUnderTest
import spock.lang.Specification

class FunctionalSpec extends Specification {
    void "default handler should render Hello World" () {
        setup: def aut = new GroovyRatpackMainApplicationUnderTest()
        when: def response = aut.httpClient.text
        then: response == "Hello World!"
        cleanup: aut.close()
    }
}
```
Merely calling `text` on the httpClient invokes a GET request. However, more complex requests can be invoked using `requestSpec`. For example, to test a specific response, it is returned based on the `User-Agent` header:

```
void "should properly render for v2.0 clients" () {
    when: 
    def response = aut.httpClient.requestSpec { nspec - >
            spec.headers.'User-Agent' = ["Client v2.0"]
    }.get("api").body.text
    then: 
    response == "V2 Model"
}
```



Learn about testing operations in Ratpack.

Testing and Conclusion

Introduction

Java Syntax and Conventions

Java 7

Idiomatic Java 8: Lambdas, Streams, and Dates

New Date and Time API

Java 8 Miscellaneous

Advantages of Java 9

Java 10 - 17

Java Ecosystem

Maven and JUnit

Utilizing Essential Libraries

Modern Java Concurrency

RxJava

Other JVM Languages

Groovy

Gradle

Spock

Scala

RESTful

Microservices and Clouds

Grails

Spark

Spring Boot

Play Framework

Ratpack

Final Thoughts

Appendix

Testing and Conclusion

Testing