gwt 1.7 compile from ant build file

I need to compile my GWT 1.7 project from my ant build file....anyone know how to do that???

I was able to d开发者_StackOverflow社区o this in GWT 1.5 with the following code in my ant file:

<target name="compile">
   <exec executable="${root.dir}/HelloWorld-compile.cmd"  failonerror="true"/>

here are some ant targets that I use to run in hosted mode and to compile using gwt 1.7.1.

<property name="src.dir" value="src/main/java" />
<property name="build.dir" value="war" />

<path id="compile.classpath">
        <fileset dir="${build.dir}/WEB-INF/lib">
            <include name="**/*.jar" />
            <include name="**/*.xml" />
        </fileset>
    </path>

<target name="hosted" depends="javac" description="Starts gwt project in a standalone hosted browser and runs embedded jetty on port 8888">
            <java failonerror="true" fork="true" classname="com.google.gwt.dev.HostedMode">
                <classpath>
                    <pathelement location="${src.dir}" />
                    <path refid="compile.classpath" />
                </classpath>
                <jvmarg value="-Xms256M" />
                <jvmarg value="-Xmx256M" />
                <arg value="-startupUrl" />
                <arg value="index.html" />
                <arg value="com.gwt-example.ModuleName" />
            </java>
        </target>

<target name="gwtc" depends="javac" description="GWT compile to JavaScript">
            <java failonerror="true" fork="true" classname="com.google.gwt.dev.Compiler">
                <classpath>
                    <pathelement location="${src.dir}" />
                    <path refid="compile.classpath" />
                </classpath>
                <jvmarg value="-Xmx256M" />
                <arg value="com.gwt-example.ModuleName" />
            </java>
        </target>