Follow the instructions below to install WSO2 Enterprise Service Bus (binary) v.4.0.3 on Windows.
Note
Before you install the ESB, ensure that your system meets the minimum hardware and software requirements described in Installation Prerequisites.
Step 1. Obtain Installation Pack
Download the latest version of the program (for downloading instructions, see Obtaining ESB).
Step 2. Extract the Archive
After the download is complete, extract installation files to the user-defined folder (further to be referred to as ESB_HOME).
Step 3. Set up JAVA_HOME
JAVA_HOME environment variable set up is needed to run WSO2 ESB. The variable points at the directory where the Java™ Development Kit (JDK) is installed on the computer.
Reference
Environment variables are global system variables accessible by all the processes running under the operating system.
Locate the Installation Folder of the Java™ Development Kit (JDK) on the Machine
1. In order to set the variable, it is necessary to know the system folder to which JDK is installed. Unless the installation path was changed by the user during the installation process, it is installed into the default folder C:\Program Files\Java. Open the directory C:\Program Files\Java using the browser.
2. Inside that path there will be one or more subdirectories, for example, jdk1.5.0_08. If you just have installed the Java Development Kit, it is in the newest directory, which you can find by sorting by date. For example, it may be installed in C:\Program Files\Java\jdk1.6.0_25. This is the installation path.
There are two ways to set up JAVA_HOME: via "System Properties", or via "Windows Command Prompt".
JAVA_HOME Setup via System Properties
Follow the instructions below to set up the JAVA_HOME environment variable using "System Properties".
1. Right-click the "My Computer" icon on the desktop.
2. Click "Properties."
3. The "System Properties" window opens with its functional tabs. Go to the "Advanced" tab.
4. In the "Advanced" tab click on the "Environment Variables" button.
5. The "Environment variables" window opens. Click the "New" button under "System variables" (for all users).
6. The "New system variable" input box opens. Fill in the required fields:
- In the "Variable name" field, enter "JAVA_HOME" without quotes.
- In the "Variable value" field, enter the installation path of the Java Development Kit. For example,
c:\Program Files\Java\jdk1.6.0_25.
6. In the "New User Variable" popup, fill in the required fields:
- In the "Variable name" field, enter "JAVA_HOME" without quotes.
- In the "Variable value" field, enter the installation path of the Java Development Kit, for example,
C:\Program Files\java\jdk1.6.0_25.
7. Click "OK."
*"System variables"* or *"User variables"*?
In case there is a need to set up variables only for the user currently logged in, JAVA_HOME should be set up in "User Variables" (the same way as in "System variables"). These changes will not affect any other users.
Notice
Variable set up will be effective for the CMD opened after this operation. In case a CMD had run before the variable was set up, this change will not be effective for it. To ensure the variable set up is effective, and variable value is reset, close and reopen the CMD you will be running ESB from, or close and re-open the browser (e.g. Total Commander) you are going to run the CMD from.
JAVA_HOME setup via Windows command prompt (CMD)
Alternatively, you can temporarily set the JAVA_HOME environment variable within a Windows command prompt window (CMD).
1. Click "Start" 
"Run".
2. Type "cmd" click "OK" to run CMD.
3. In the opened CMD, enter the following command and press "Enter":
set JAVA_HOME=<JDK_INSTALLATION_PATH>
Where "<JDK_INSTALLATION_PATH>" is the actual JDK installation directory.
For example, set JAVA_HOME=c:\Program Files\java\jdk1.6.0_25.
4. JAVA_HOME is effectively set up.
Notice
A variable set via the SET command under CMD is a local variable, available to the current CMD session only.
Verify JAVA_HOME Set Up
Follow the instructions below to check if JAVA_HOME was set up correctly:
1. Click "Start" "Run".
2. Type "cmd" click "OK" to run CMD.
3. In the opened CMD window, enter the following command and press "Enter":
set JAVA_HOME
4. The program shows that JAVA_HOME is set to the JDK installation path, for example, JAVA_HOME=:c\Program Files\java\jdk1.6.0_25.
This means that JAVA_HOME was set up correctly.
Step 4. Run ESB Start Script
In order to run ESB Management Console, it is necessary to run ESB start script.
Follow the instructions below:
1. Click "Start" "Run".
2. Type "cmd" click "OK" to run "CMD".
3. Go to ESB_HOME\bin via the following command:
cd ESB_HOME\bin
For example, cd c:\wso2\wso2esb-4.0.3\bin.
4. Execute the following command:
wso2server.bat --run
5. Operation log is displayed. Make sure no errors occurred.
Step 4. Access ESB Management Console
ESB is installed and environment variables are set up. Proceed to Starting ESB Management Console on Windows for the instructions on how to run the ESB Management Console.