Java Card 3.0.4 classic specification is introducing a syntax using the
String type in a new annotation which allows an annotation processor to
create source files with declarations of pre-initialized byte arrays
with the UTF-8 representation to correspond to the String constants.

To support this feature, please upadte the template used for creating a classic
applet application project's build-impl.xml file to include support for the annotation processor when the java card platform is a 3.0.4 or higher (defined by the property javacard.version=3.0.4 in the platform.properties file). The annotation processor may be invoked in the compile target as shown below :

<target name="compile" depends="-init">
        <javac destdir="${build.classes.dir}" source="${javac.source}"
               target="${javac.target}" nowarn="${javac.deprecation}"
               debug="${javac.debug}" optimize="no"
               bootclasspath="${javacard.classic.bootclasspath};${jcdk.lib}/api_classic_annotations.jar"
               includeAntRuntime="no">
            <src path="${src.dir}"/>
            <src path="${build.classes.dir}"/>
            <classpath id="compile.path"/>
            <compilerarg line="-processor com.oracle.javacard.stringproc.StringConstantsProcessor -processorpath \\'${jcdk.lib}/tools.jar;${jcdk.lib}/api_classic_annotations.jar\\'"/>
        </javac>
        <condition property="compile.proxies">
            <and>
                <isset property="use.my.proxies"/>
                <equals arg1="${use.my.proxies}" arg2="true"/>
                <available file="${src.proxies.dir}" type="dir"/>
            </and>
        </condition>
        <copy todir="${build.classes.dir}">
            <fileset dir="${src.dir}" includes="${includes}" excludes="${excludes}"/>
        </copy>
    </target>