Easy to use Ant task for building JavaCard Classic applets (2.1.2 to 3.0.5)
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Building JavaCard applet CAP files with Ant

Easy to use Ant task for building JavaCard CAP files in a declarative way.

Build status   Coverity   Latest release   Maven Central   MIT licensed


  • Do What I Mean. You will love it!
  • No dependencies, no extra or unrelated downloads. Just a 14KB jar.
  • Supports all available JavaCard SDK versions: 2.1.2, 2.2.1, 2.2.2, 3.0.3, 3.0.4 and 3.0.5
  • Works on all platforms with Java 1.8: Windows, OSX, Linux.
  • Almost everything integrates or works with Ant.
  • Can be easily integrated into continuous integration workflows.
  • Generates CAP files from sources or pre-compiled class files.
  • Import external libraries: natural use of .exp files and .jar libraries.
  • No restrictions on project folder layout.
  • Loading JavaCard applets is equally pleasing with GlobalPlatformPro

Download & Use

<get src="https://github.com/martinpaljak/ant-javacard/releases/download/18.07.12/ant-javacard.jar" dest="." skipexisting="true"/>
  • Then add the following to your build.xml file:
<taskdef name="javacard" classname="pro.javacard.ant.JavaCard" classpath="ant-javacard.jar"/>
  • Now you can create applets within your Ant targets like this:
  <cap jckit="/path/to/jckit_dir" aid="0102030405" output="MyApplet.cap" sources="src/myapplet">
    <applet class="myapplet.MyApplet" aid="0102030405060708"/>

(which results in output similar to this)

      [cap] INFO: using JavaCard v2.2.2 SDK in ../jc222_kit
      [cap] Setting package name to testapplets
      [cap] Building CAP with 1 applet from package testapplets
      [cap] testapplets.Empty 0102030405060708
  [compile] Compiling 1 source file to /var/folders/l7/h99c5w6j0y1b8_qbsth_9v4r0000gn/T/antjc4506897175807383834
      [cap] CAP saved to /Users/martin/projects/ant-javacard/Empty222.cap



<javacard jckit="/path/to/jckit_dir1">
  <cap jckit="/path/to/jckit_dir2" aid="0102030405" package="package.name" version="0.1" output="MyApplet.cap" sources="src/myapplet" classes="path/to/classes" export="mylib">
    <applet class="myapplet.MyApplet" aid="0102030405060708"/>
    <import exps="path/to/exps" jar="/path/to/lib.jar"/>


  • javacard tag - generic task
    • jckit attribute - path to the JavaCard SDK that is used if individual cap does not specify one. Optional if cap defines one, required otherwise.
  • cap tag - construct a CAP file
    • jckit attribute - path to the JavaCard SDK to be used. Optional if javacard defines one, required otherwise.
    • targetsdk attribute - path to the target JavaCard SDK to be used for this CAP. Optional, value of jckit used by default. Allows to use a more recent converter to target older JavaCard platforms.
    • sources attribute - path to Java source code, to be compiled against the current JavaCard SDK. Either sources or classes is required.
    • sources2 attribute - additional sources to build per-platform applets. Optional.
    • classes attribute - path to pre-compiled class files to be assembled into a CAP file. If both classes and sources are specified, compiled class files will be put to classes folder, which is created if missing.
    • package attribute - name of the package of the CAP file. Optional for applets - set to the parent package of the applet class if left unspecified, required for libraries
    • version attribute - version of the package. Optional - defaults to 0.1 if left unspecified.
    • fidesmoappid attribute - Fidesmo appId, to create the package AID and applet AID-s automatically. Optional.
    • aid attribute - AID (hex) of the package. Recommended - or set to the 5 first bytes of the applet AID if left unspecified.
    • output attribute - path where to save the generated CAP file. Recommended - or set to applet class/package name + ".cap"
    • export attribtue - path (folder) where to place the JAR and generated EXP file. Optional.
    • jar attribute - path where to save the generated archive JAR file. Optional.
    • jca attribute - path where to save the generated JavaCard Assembly (JCA) file. Optional.
    • verify attribute - if set to false, disables verification of the resulting CAP file with offcardeverifier. Optional.
    • debug attribute - if set to true, generates debug CAP components. Optional.
    • ints attribute - if set to true, enables support for 32 bit int type. Optional.
    • javaversion attribute - override the Java source and target version. Optional.
  • applet tag - for creating an applet inside the CAP
    • class attribute - class of the Applet where install() method is defined. Required.
    • aid attribute - AID (hex) of the applet. Recommended - or set to package aid+i where i is index of the applet definition in the build.xml instruction
  • import tag - for linking against external components/libraries, like GPSystem or OPSystem
    • exps attribute - path to the folder keeping .exp files. Optional. Required if jar does not include .exp files.
    • jar attribute - path to the JAR file for compilation. Required if using sources mode and not necessary with classes mode if java code is already compiled


  • jc.home property has the highest precedence, followed by jckit path of cap, followed by path in javacard, followed by JC_HOME environment variable. SDK must be valid to be considered for use.


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