Use ant+ivy to build java project without having to perform dependency resolution on every compilation.

build.xml

<project name="test" xmlns:ivy="antlib:org.apache.ivy.ant">
    <property name="src.dir" value="src/main/java" />
    <property name="build.dir" value="build" />
    <property name="classes.dir" value="build/main/classes" />

    <target name="resolve">
        <ivy:cachepath pathid="lib.path.id" />
        <echo file="classpath.properties">compile.classpath=${toString:lib.path.id}</echo>
    </target>

    <target name="compileJava">
        <property file="classpath.properties" />
        <mkdir dir="${classes.dir}"/>
        <javac srcdir="${src.dir}" destdir="${classes.dir}" classpath="${compile.classpath}"/>
     </target>
</project>