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Prepare your development environment

This document describes how to prepare your development environment to use the Microsoft Azure IoT service SDK for Java.

## Install Java JDK SE To use the SDK and run the samples you will need **Java SE 8**.

Windows

For downloads and installation instructions go here: http://www.oracle.com/technetwork/java/javase/downloads/index.html

Set up environment variables

  • Please make sure that the PATH environment variable includes the full path to the jdk1.8.x\bin directory. (Example: C:\Program Files\Java\jdk1.8.0_60\bin)
  • Please make sure that the JAVA_HOME environment variable includes the full path to the jdk1.8.x directory. (Example: JAVA_HOME=C:\Program Files\Java\jdk1.8.0_60)

You can test whether your PATH variable is set correctly by restarting your console and running java -version.

Linux

Note: If you are running a version of Ubuntu below 14.10, you must run the command shown below to add the repository that contains the openjdk-8-jdk package to Ubuntu's list of software sources before you attempt to use the apt-get command to install openjdk-8-jdk:

sudo add-apt-repository ppa:openjdk-r/ppa

On Linux, the Java OpenJDK 8 can be installed as follows:

sudo apt-get update
sudo apt-get install openjdk-8-jdk

Set up environment variables

  • Please make sure that the PATH environment variable includes the full path to the bin folder containing java.

     which java
 echo $PATH

    Ensure that the bin directory shown by the which java command matches one of the directories shown in your $PATH variable. If it does not:

     export PATH=/path/to/java/bin:$PATH

  • Please make sure that the JAVA_HOME environment variable includes the full path to the jdk.

     update-alternatives --config java

    Take note of the jdk location. update-alternatives will show something similar to /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java. The jdk directory would then be /usr/lib/jvm/java-8-openjdk-amd64/.

     export JAVA_HOME=/path/to/jdk
## Install Maven Using **_Maven 3_** is the recommended way to install **Azure IoT service SDK for Java**.

Windows

For downloads and installation instructions go here: https://maven.apache.org/download.cgi

Set up environment variables

  • Please make sure that the PATH environment variable includes the full path to the apache-maven-3.x.x\bin directory. (Example: F:\Setups\apache-maven-3.3.3\bin). The apache-maven-3.x.x directory is where Maven 3 is installed.

You can verify that the environment variables necessary to run Maven 3 have been set correctly by restarting your console and running mvn --version.

Linux

On Linux, Maven 3 can be installed as follows:

sudo apt-get update
sudo apt-get install maven

Set up environment variables

Please verify the following:

Ensure the PATH environment variable contains the full path to the bin folder containing Maven 3.

```
which mvn
echo $PATH
```

Ensure that the bin directory shown by the which mvn command matches one of the directories shown in your $PATH variable. If it does not: export PATH=/path/to/mvn/bin:$PATH

You can verify that the environment variables necessary to run Maven 3 have been set correctly by running mvn --version.

## Install Azure IoT service SDK for Java
  • There are two ways to get the .jar library for the Azure IoT service SDK. You may either download the source code and build on your machine, or include the project as a dependency in your project if your project is a Maven project. Both methods are described below.
 ### Build Azure IoT service SDK for Java from Sources - Get a copy of the **Azure IoT service SDK** from GitHub. You should fetch a copy of the source from the **master** branch of the GitHub repository: - When you have obtained a copy of the source, you can build the SDK for Java.

Open a command prompt and use the following commands for the steps above:

	git clone https://github.com/Azure/azure-iot-sdks.git
	cd azure-iot-sdks/java/service
	mvn install

The compiled JAR file with all dependencies bundled in can then be found at:

{IoT SDK root}/java/service/iothub-java-client/target/iothub-java-client-{version}-with-deps.jar

When you're ready to use the Java SDK in your own project, include this JAR file in your project to use the IoT service SDK.

 ### Get Azure IoT service SDK for Java from Maven (as a dependency) _This is the recommended method of including the Azure IoT Service SDK in your project, however this method will only work if your project is a Maven project_
  • Navigate to http://search.maven.org, search for com.microsoft.azure.iothub-java-client and take note of the latest version number of the service client (or the version number of whichever version of the sdk you desire to use).

In your main pom.xml file, add the Azure IoT Service SDK as a dependency using your desired version as follows:

<dependency>
    <groupId>com.microsoft.azure.iothub-java-client</groupId>
    <artifactId>iothub-java-service-client</artifactId>
    <version>1.0.2</version>
	<!--This is the current version number as of the writing of this document. Yours may be different.-->
</dependency>
## Sample applications

This repository contains various sample applications that illustrate how to use the Microsoft Azure IoT service SDK for Java. For more information, see the readme.

To learn how to run a simple Getting started Java application that sends messages to an IoT hub, see Getting started - running a Java sample.