Getting Started

Getting Binaries

You can find binaries and dependency information for Maven, Ivy, Gradle, SBT, and others at http://search.maven.org.

Example for Maven:

<dependency>
    <groupId>com.netflix.rxjava</groupId>
    <artifactId>rxjava-core</artifactId>
    <version>0.17.0</version>
</dependency>

and for Ivy:

<dependency org="com.netflix.rxjava" name="rxjava-core" rev="0.17.0" />

and for SBT:

libraryDependencies += "com.netflix.rxjava" % "rxjava-scala" % "0.17.0"

If you need to download the jars instead of using a build system, create a Maven pom file like this with the desired version:

<?xml version="1.0"?>
<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.netflix.rxjava.download</groupId>
	<artifactId>rxjava-download</artifactId>
	<version>1.0-SNAPSHOT</version>
	<name>Simple POM to download rxjava-core and dependencies</name>
	<url>http://github.com/Netflix/RxJava</url>
	<dependencies>
		<dependency>
			<groupId>com.netflix.rxjava</groupId>
			<artifactId>rxjava-core</artifactId>
			<version>0.17.0</version>
			<scope/>
		</dependency>
	</dependencies>
</project>

Then execute:

$ mvn -f download-rxjava-pom.xml dependency:copy-dependencies

That command downloads rxjava-core-*.jar and its dependencies into ./target/dependency/.

You need Java 6 or later.

Hello World!

The following are RxJava implementations of “Hello World” in Java, Groovy, Clojure and Scala:

In Java =>

    public static void hello(String... names) {
        Observable.from(names).subscribe(new Action1<String>() {

            @Override
            public void call(String s) {
                System.out.println("Hello " + s + "!");
            }

        });
    }

In Groovy =>

def hello(String[] names) {
    Observable.toObservable(names)
        .subscribe({ println "Hello " + it + "!"})
}

In Clojure =>

(defn hello
  [&rest]
  (-> (Observable/toObservable &rest)
    (.subscribe #(println (str "Hello " % "!")))))

In Scala =>

def hello(args: String*) = Observable.from(args) subscribe { e =>
  println(e)
}

You can find more examples and information in the How To Use section and in the following source folders:

• Groovy: https://github.com/Netflix/RxJava/tree/master/language-adaptors/rxjava-groovy/src/examples
• Clojure: https://github.com/Netflix/RxJava/tree/master/language-adaptors/rxjava-clojure/src/examples
• Scala: https://github.com/Netflix/RxJava/tree/master/language-adaptors/rxjava-scala/src/examples

Building

To check out and build the RxJava source, issue the following commands:

$ git clone git@github.com:Netflix/RxJava.git
$ cd RxJava/
$ ./gradlew build

To do a clean build, issue the following command:

$ ./gradlew clean build

A build should look similar to this:

$ ./gradlew build
:rxjava-core:compileJava
:rxjava-core:processResources UP-TO-DATE
:rxjava-core:classes
:rxjava-core:jar
:rxjava-core:sourcesJar
:rxjava-core:signArchives SKIPPED
:rxjava-core:assemble
:rxjava-core:licenseMain UP-TO-DATE
:rxjava-core:licenseTest UP-TO-DATE
:rxjava-core:compileTestJava
:rxjava-core:processTestResources UP-TO-DATE
:rxjava-core:testClasses
:rxjava-core:test
:rxjava-core:check
:rxjava-core:build

BUILD SUCCESSFUL

Total time: 30.758 secs

On a clean build you will see the unit tests run. They will look something like this:

> Building > :rxjava-core:test > 91 tests completed

Troubleshooting

One developer reported getting the following error:

Could not resolve all dependencies for configuration ':language-adaptors:rxjava-scala:provided'

He was able to resolve the problem by removing old versions of scala-library from .gradle/caches and .m2/repository/org/scala-lang/ and then doing a clean build. (See this page for details.)