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Chapter 3. Getting started
This chapter guides you through the steps to set up your environment and run a simple messaging program.
3.1. Prerequisites
- To build the example, Maven must be configured to use the Red Hat repository or a local repository.
- You must install the examples.
-
You must have a message broker listening for connections on
localhost
. It must have anonymous access enabled. For more information, see Starting the broker. -
You must have a queue named
queue
. For more information, see Creating a queue.
3.2. Running Hello World
The Hello World example creates a connection to the broker, sends a message containing a greeting to the queue
queue, and receives it back. On success, it prints the received message to the console.
Procedure
Use Maven to build the examples by running the following command in the
<install-dir>/examples
directory:$ mvn clean package dependency:copy-dependencies -DincludeScope=runtime -DskipTests
The addition of
dependency:copy-dependencies
results in the dependencies being copied into thetarget/dependency
directory.Use the
java
command to run the example.On Linux or UNIX:
$ java -cp "target/classes:target/dependency/*" org.apache.qpid.jms.example.HelloWorld
On Windows:
> java -cp "target\classes;target\dependency\*" org.apache.qpid.jms.example.HelloWorld
For example, running it on Linux results in the following output:
$ java -cp "target/classes/:target/dependency/*" org.apache.qpid.jms.example.HelloWorld Hello world!
The source code for the example is in the <install-dir>/examples/src/main/java
directory. The JNDI and logging configuration is in the <install-dir>/examples/src/main/resources
directory.