Building and releasing a simple java app using GO

1. Create repository (using git) and have sample java code. 

a. Create a git repository

C:\>mkdir git_repo
C:\>cd git_repo
C:\git_repo>git init

b. Create java code  and check-in:
-java code (hw.java). Place it in a subfolder called src in the git repository. The build.xml reads from the src folder
-create ant build file,  build.xml
-check-in the java code, build.xml and the src folders into git

2. Create a new pipeline from Admin menu
Goal is to create a hierachical structure like pipeline ==> stage ==> job

Create a new pipeline within the default pipeline group by clicking 'create a new pipeline within this group'

Step #1 : give new pipeline a name
Step #2 : Materials: Material Type =Git
                                   URL = C:/git_repo

Check connection to verify that it was created successfully
Step #3 : Stage/Job
                 Stage Name = defaultStage
                 Job Name = defaultJob
                 Task type = Ant
   
Task type could be a custom command, say a shell script, which gives more felxibility because now you can run a ant build from the script and also use the echo command to display interim results.

Click Finish and the new pipeline is ready.

Environment variables

-Create an environment variable for the pipeline by going to Admin-->your pipeline-->Ebvironment Variables tab.

JAVA_HOME=C:\Java\jdk1.6.0_27
This variable will be used by ant to compile java code created in #1.

-Add ant bin, git bin to the PATH environment variable by going to Control Panel -->System in Windows.
C:\apache-ant-1.5.2\bin;C:\Program Files (x86)\Git\bin

3. Execute the new pipeline from Pipeline menu
   -Lookup the pipeline that was created and click the arrow to trigger execution
   -Click defaultJob in left pane
   -Select Materials tab. Verify visually that it has the java code (src/hw.java)
   -Select Console tab. Scroll down to find the results of run. Verify that there are no errors. If there are no errors , the pipeline will turn green.

Verifying pipeline config by looking up xml
Goto Admin menu and select the 'Source XML' tab.
And make note of the XML for the pipeline

==================================================
<pipeline name="t">
      <environmentvariables>
        <variable name="JAVA_HOME">C:\Java\jdk1.6.0_27</variable>
      </environmentvariables>
      <materials>
        <git url="c:/git_repo" />
      </materials>
      <stage name="defaultStage">
        <jobs>
          <job name="defaultJob">
            <tasks>
              <ant />
            </tasks>
          </job>
        </jobs>
      </stage>
    </pipeline>

=== And in Source XML there is only one agent executing =========
<agents>
    <agent hostname="RC6186" ipaddress="10.102.100.134" uuid="00c2c460-68ed-4d9b-bce4-c7260f61caa7" />
</agents>

===================================================================

SAMPLE CODE

====== java code ==========
public class hw
{
public static void main(String args[])
{
   System.out.println("Hello World");
}
}
======= build.xml ===========

<project name="hw" basedir="." default="main">

    <property name="src.dir"     value="src"/>
    <property name="build.dir"   value="build"/>
    <property name="classes.dir" value="${build.dir}/classes"/>
    <property name="jar.dir"     value="${build.dir}/jar"/>
    <property name="main-class"  value="hw"/>

    <target name="clean">
        <delete dir="${build.dir}"/>
    </target>

    <target name="compile">
        <mkdir dir="${classes.dir}"/>
        <javac srcdir="${src.dir}" destdir="${classes.dir}"/>
    </target>

    <target name="jar" depends="compile">
        <mkdir dir="${jar.dir}"/>
        <jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
            <manifest>
                <attribute name="Main-Class" value="${main-class}"/>
            </manifest>
        </jar>
    </target>

    <target name="run" depends="jar">
        <java jar="${jar.dir}/${ant.project.name}.jar" fork="true"/>
    </target>

    <target name="clean-build" depends="clean,jar"/>

    <target name="main" depends="clean,run"/>

</project>

=========common git commands ==========
git status
git add build.xml
git commit -m "comming build.xml" -a
git log