Assignment calls the wrong setter, depending on order of declaration

<?xml version="1.0" encoding="UTF-8"?>
<project name="test" default="run">

	<path id="groovy.classpath">
		<fileset dir="." includes="groovy-*.jar"/>
	</path>

	<taskdef name="groovy" classname="org.codehaus.groovy.ant.Groovy" classpathref="groovy.classpath"/>

	<target name="compile">
		<echo file="Test.java">
			public class Test
			{
				public void setField( String value )
				{ 
					System.out.println( "String" );
				}
			
				public void setField( Integer value )
				{ 
					System.out.println( "Integer" );
				}
			}
		</echo>
		<javac srcdir="." includes="Test.java"/>
	</target>

	<target name="run" depends="compile">
		<groovy>
			try
			{
				new Test().setField( "sss" ) // This works
				println "success 1"
				new Test().field = "sss" // This gives exception
				println "success 2"
			}
			catch( Exception e )
			{
				e.printStackTrace( System.out )
			}
		</groovy>
	</target>

</project>