build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="hello-javacard" default="help" basedir=".">
    <property name="src.dir" value="src"/>
    <property name="build.dir" value="build"/>
    <property name="classes.dir" value="${build.dir}/classes"/>
    <property name="cap.out.dir" value="${build.dir}/cap"/>

    <!-- Java Card app/package identifiers for this starter applet -->
    <property name="package.name" value="com.example.jc"/>
    <property name="package.aid" value="0xA0:0x00:0x00:0x00:0x62:0x03:0x01:0x0C:0x01"/>
    <property name="package.version" value="1.0"/>
    <property name="applet.class" value="com.example.jc.HelloApplet"/>
    <property name="applet.aid" value="0xA0:0x00:0x00:0x00:0x62:0x03:0x01:0x0C:0x01:0x01"/>

    <!-- Prefer JC_HOME; fallback to local SDK folder in this repo -->
    <condition property="jc.home" value="${env.JC_HOME}" else="${basedir}/tools/sdk-2.2.2">
        <and>
            <isset property="env.JC_HOME"/>
            <not>
                <equals arg1="${env.JC_HOME}" arg2=""/>
            </not>
        </and>
    </condition>

    <property name="jc.api.jar" value="${jc.home}/lib/api.jar"/>
    <property name="jc.converter.jar" value="${jc.home}/lib/converter.jar"/>
    <property name="jc.verifier.jar" value="${jc.home}/lib/offcardverifier.jar"/>
    <property name="jc.export.path" value="${jc.home}/api_export_files"/>

    <!-- Compile Java Card 2.2.2 sources with JDK 8 toolchain explicitly. -->
    <condition property="java8.home" value="${env.JAVA8_HOME}" else="/Library/Java/JavaVirtualMachines/temurin-8.jdk/Contents/Home">
        <and>
            <isset property="env.JAVA8_HOME"/>
            <not>
                <equals arg1="${env.JAVA8_HOME}" arg2=""/>
            </not>
        </and>
    </condition>

    <target name="help">
        <echo>Targets:</echo>
        <echo>  ant check-env      - Validate Java and Java Card SDK setup.</echo>
        <echo>  ant clean          - Remove build outputs.</echo>
        <echo>  ant compile        - Compile applet source.</echo>
        <echo>  ant package-cap    - Convert class files to CAP/EXP/JCA outputs.</echo>
    </target>

    <target name="check-env">
        <available file="${jc.home}" type="dir" property="jc.home.exists"/>
        <available file="${jc.api.jar}" property="jc.api.exists"/>
        <available file="${jc.converter.jar}" property="jc.converter.exists"/>
        <available file="${jc.verifier.jar}" property="jc.verifier.exists"/>
        <available file="${jc.export.path}" type="dir" property="jc.export.exists"/>
        <available file="${java8.home}/bin/javac" property="java8.javac.exists"/>
        <available file="${java8.home}/bin/java" property="java8.java.exists"/>

        <fail message="Java runtime not detected. Install JDK 8 and ensure 'java' is available in PATH.">
            <condition>
                <not>
                    <available file="${java.home}"/>
                </not>
            </condition>
        </fail>

        <fail message="Java Card SDK directory not found: ${jc.home}">
            <condition>
                <not>
                    <isset property="jc.home.exists"/>
                </not>
            </condition>
        </fail>

        <fail message="Missing API jar: ${jc.api.jar}">
            <condition>
                <not>
                    <isset property="jc.api.exists"/>
                </not>
            </condition>
        </fail>

        <fail message="Missing converter jar: ${jc.converter.jar}">
            <condition>
                <not>
                    <isset property="jc.converter.exists"/>
                </not>
            </condition>
        </fail>

        <fail message="Missing verifier jar: ${jc.verifier.jar}">
            <condition>
                <not>
                    <isset property="jc.verifier.exists"/>
                </not>
            </condition>
        </fail>

        <fail message="Missing export path: ${jc.export.path}">
            <condition>
                <not>
                    <isset property="jc.export.exists"/>
                </not>
            </condition>
        </fail>

        <fail message="JDK8 javac not found at ${java8.home}/bin/javac. Set JAVA8_HOME or adjust java8.home in build.xml.">
            <condition>
                <not>
                    <isset property="java8.javac.exists"/>
                </not>
            </condition>
        </fail>

        <fail message="JDK8 java not found at ${java8.home}/bin/java. Set JAVA8_HOME or adjust java8.home in build.xml.">
            <condition>
                <not>
                    <isset property="java8.java.exists"/>
                </not>
            </condition>
        </fail>

        <echo message="JC_HOME=${jc.home}"/>
        <echo message="JAVA8_HOME=${java8.home}"/>
        <echo message="Java runtime: ${java.version}"/>
        <echo message="Toolchain check passed."/>
    </target>

    <target name="clean">
        <delete dir="${build.dir}"/>
        <mkdir dir="${build.dir}"/>
    </target>

    <target name="compile" depends="clean,check-env">
        <mkdir dir="${classes.dir}"/>
        <javac srcdir="${src.dir}"
               destdir="${classes.dir}"
               includeantruntime="false"
               source="1.5"
               target="1.5"
               debug="true"
               fork="true"
               executable="${java8.home}/bin/javac">
            <classpath>
                <pathelement path="${jc.api.jar}"/>
            </classpath>
        </javac>
    </target>

    <target name="package-cap" depends="compile">
        <mkdir dir="${cap.out.dir}"/>
        <java classname="com.sun.javacard.converter.Converter" fork="true" failonerror="true" jvm="${java8.home}/bin/java">
            <classpath>
                <pathelement path="${jc.converter.jar}"/>
                <pathelement path="${jc.verifier.jar}"/>
                <pathelement path="${jc.api.jar}"/>
            </classpath>
            <arg value="-classdir"/>
            <arg value="${classes.dir}"/>
            <arg value="-exportpath"/>
            <arg value="${jc.export.path}"/>
            <arg value="-out"/>
            <arg value="CAP"/>
            <arg value="EXP"/>
            <arg value="JCA"/>
            <arg value="-d"/>
            <arg value="${cap.out.dir}"/>
            <arg value="-applet"/>
            <arg value="${applet.aid}"/>
            <arg value="${applet.class}"/>
            <arg value="${package.name}"/>
            <arg value="${package.aid}"/>
            <arg value="${package.version}"/>
        </java>
        <echo message="CAP conversion done. Check ${cap.out.dir}/${package.name} (path form) for output files."/>
    </target>
</project>