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Local Environment Setup
RxJava is a library for Java, so the very first requirement is to have JDK installed in your machine.
System Requirement
| JDK | 1.5 or above. |
|---|---|
| Memory | No minimum requirement. |
| Disk Space | No minimum requirement. |
| Operating System | No minimum 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.
| OS | Task | Command |
|---|---|---|
| Windows | Open Command Console | c:> java -version |
| Linux | Open Command Terminal | $ java -version |
| Mac | Open Terminal | machine:< joseph$ java -version |
Let”s verify the output for all the operating systems −
| OS | Output |
|---|---|
| Windows |
java version “1.8.0_101” Java(TM) SE Runtime Environment (build 1.8.0_101) |
| Linux |
java version “1.8.0_101” Java(TM) SE Runtime Environment (build 1.8.0_101) |
| Mac |
java version “1.8.0_101” Java(TM) SE Runtime Environment (build 1.8.0_101) |
If you do not have Java installed on your system, then download the Java Software Development Kit (SDK) from the following link 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.
| OS | Output |
|---|---|
| Windows | Set the environment variable JAVA_HOME to C:Program FilesJavajdk1.8.0_101 |
| Linux | export JAVA_HOME = /usr/local/java-current |
| Mac | export JAVA_HOME = /Library/Java/Home |
Append Java compiler location to the System Path.
| OS | Output |
|---|---|
| Windows | Append the string C:Program FilesJavajdk1.8.0_101bin at the end of the system variable, Path. |
| Linux | export PATH = $PATH:$JAVA_HOME/bin/ |
| Mac | not required |
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.
| OS | Archive name |
|---|---|
| Windows | rxjava-2.2.4.jar, reactive-streams-1.0.2.jar |
| Linux | rxjava-2.2.4.jar, reactive-streams-1.0.2.jar |
| Mac | rxjava-2.2.4.jar, reactive-streams-1.0.2.jar |
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.
| Sr.No | OS & Description |
|---|---|
| 1 |
Windows Set the environment variable RX_JAVA to C:RxJava |
| 2 |
Linux export RX_JAVA = /usr/local/RxJava |
| 3 |
Mac export RX_JAVA = /Library/RxJava |
Step 5 – Set CLASSPATH Variable
Set the CLASSPATH environment variable to point to the RxJava jar location.
| Sr.No | OS & Description |
|---|---|
| 1 |
Windows Set the environment variable CLASSPATH to %CLASSPATH%;%RX_JAVA%rxjava-2.2.4.jar;%RX_JAVA%reactive-streams-1.0.2.jar;.; |
| 2 |
Linux export CLASSPATH = $CLASSPATH:$RX_JAVA/rxjava-2.2.4.jar:reactive-streams-1.0.2.jar:. |
| 3 |
Mac export CLASSPATH = $CLASSPATH:$RX_JAVA/rxjava-2.2.4.jar:reactive-streams-1.0.2.jar:. |
Step 6 – Test RxJava Setup
Create a class TestRx.java as shown below −
import io.reactivex.Flowable;
public class TestRx {
public 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!
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