Ant task "javac" was successful but doesn't produce any output - ant

Question

I'm trying to compile a project using ant. I guess the "javac" task was successful as i can see the following message on the console:
[javac] Compiling 151 source file to /var/lib/jenkins/jobs/project1/workspace/build
Here is the complete output of the command "ant compile"
clean:
[delete] Deleting directory /var/lib/jenkins/jobs/project1/workspace/build
[delete] Deleting directory /var/lib/jenkins/jobs/project1/workspace/docs
[delete] Deleting directory /var/lib/jenkins/jobs/project1/workspace/dist
makedir:
[mkdir] Created dir: /var/lib/jenkins/jobs/project1/workspace/build
[mkdir] Created dir: /var/lib/jenkins/jobs/project1/workspace/docs
[mkdir] Created dir: /var/lib/jenkins/jobs/project1/workspace/dist
compile:
[javac] /var/lib/jenkins/jobs/project1/workspace/build.xml:43: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
[javac] Compiling 151 source file to /var/lib/jenkins/jobs/project1/workspace/build
BUILD SUCCESSFUL
Total time: 1 second
The problem is there is nothing produced in the folder "build" !
I'm using the same build.xml template file in other projects and it works very well, but here i can't understand why i can't find the compiled sources in the build folder.
Please help.
Here is my build.xml file:
<?xml version="1.0"?>
<project name="project1" default="main" basedir=".">
<!-- Sets variables which can later be used. -->
<!-- The value of a property is accessed via ${} -->
<property name="src.dir" location="src" />
<property name="lib.dir" location="WebContent/WEB-INF/lib" />
<property name="server.common.lib.dir" location="/home/ghali/jboss-5.1.0.GA/common/lib" />
<property name="server.lib.dir" location="/home/ghali/jboss-5.1.0.GA/lib" />
<property name="build.dir" location="build" />
<property name="dist.dir" location="dist" />
<property name="docs.dir" location="docs" />
<!--
Create a classpath container which can be later used in the ant task
-->
<path id="build.classpath">
<fileset dir="${lib.dir}">
<include name="**/*.jar" />
</fileset>
<fileset dir="${server.common.lib.dir}">
<include name="**/*.jar" />
</fileset>
<fileset dir="${server.lib.dir}">
<include name="**/*.jar" />
</fileset>
</path>
<!-- Deletes the existing build, docs and dist directory-->
<target name="clean">
<delete dir="${build.dir}" />
<delete dir="${docs.dir}" />
<delete dir="${dist.dir}" />
</target>
<!-- Creates the build, docs and dist directory-->
<target name="makedir">
<mkdir dir="${build.dir}" />
<mkdir dir="${docs.dir}" />
<mkdir dir="${dist.dir}" />
</target>
<!-- Compiles the java code -->
<target name="compile" depends="clean, makedir">
<javac destdir="${build.dir}" classpathref="build.classpath" debug="true">
<src path="${src.dir}" />
</javac>
</target>
<!-- Creates Javadoc -->
<target name="docs" depends="compile">
<javadoc sourcepath="${src.dir}" destdir="${docs.dir}">
<!-- Define which files / directory should get included, we include all -->
<fileset dir="${src.dir}">
<include name="**" />
</fileset>
</javadoc>
</target>
<!--Creates the deployable jar file -->
<target name="package" depends="compile">
<war destfile="${dist.dir}/project1.war" webxml="WebContent/WEB-INF/web.xml">
<fileset dir="WebContent" />
<lib dir="WebContent/WEB-INF/lib" />
<classes dir="${build.dir}" />
</war>
</target>
<target name="main" depends="compile, package, docs">
<description>Main target</description>
</target>
</project>