RxJava - Environment Setup

Local Environment Setup

RxJava is a pbrary for Java, so the very first requirement is to have JDK installed in your machine.

System Requirement

Step 1 - Verify Java Installation in Your Machine

First of all, open the console and execute a java command based on the operating system you are working on.

Let s verify the output for all the operating systems −

If you do not have Java installed on your system, then download the Java Software Development Kit (SDK) from the following pnk https://www.oracle.com. We are assuming Java 1.8.0_101 as the installed version for this tutorial.

Step 2 - Set JAVA Environment

Set the JAVA_HOME environment variable to point to the base directory location where Java is installed on your machine. For example.

Append Java compiler location to the System Path.

Verify Java installation using the command java -version as explained above.

Step 3 - Download RxJava2 Archive

Download the latest version of RxJava jar file from RxJava @ MVNRepository and its dependency Reactive Streams @ MVNRepository . At the time of writing this tutorial, we have downloaded rxjava-2.2.4.jar, reactive-streams-1.0.2.jar and copied it into C:>RxJava folder.

Step 4 - Set RxJava Environment

Set the RX_JAVA environment variable to point to the base directory location where RxJava jar is stored on your machine. Let’s assuming we ve stored rxjava-2.2.4.jar and reactive-streams-1.0.2.jar in the RxJava folder.

Step 5 - Set CLASSPATH Variable

Set the CLASSPATH environment variable to point to the RxJava jar location.

Step 6 - Test RxJava Setup

Create a class TestRx.java as shown below −

import io.reactivex.Flowable;
pubpc class TestRx {
   pubpc static void main(String[] args) {
      Flowable.just("Hello World!").subscribe(System.out::println);
   }
}

Step 7 - Verify the Result

Compile the classes using javac compiler as follows −

C:RxJava>javac Tester.java

Verify the output.

Hello World!