This is simple JavaCard project template using Gradle build system.

You can develop your JavaCard applets and build cap files with the Gradle! Moreover the project template enables you to test the applet with JCardSim or on the physical cards.

Gradle project contains one module:

• applet: contains the javacard applet. Can be used both for testing and building CAP

Features:

• Gradle build (CLI / IntelliJ Idea)
• Build CAP for applets
• Test applet code in JCardSim / physical cards
• IntelliJ Idea: Coverage
• Travis support

The template contains simple Hello World applet generating random bytes on any APDU message received. There is also implemented very simple test that sends static APDU command to this applet - in JCardSim.

The Gradle project can be opened and run in the IntelliJ Idea.

Running in IntelliJ Idea gives you a nice benefit: Coverage!

• Clone this template repository:

git clone --recursive https://github.com/ph4r05/javacard-gradle-template.git

• Implement your applet in the applet module.

• Run Gradle wrapper ./gradlew on Unix-like system or ./gradlew.bat on Windows to build the project for the first time (Gradle will be downloaded if not installed).

• Setup your Applet ID (AID) in the ./applet/build.gradle.

• Run the buildJavaCard task:

./gradlew buildJavaCard  --info --rerun-tasks

Generates a new cap file ./applet/out/cap/applet.cap

Note: --rerun-tasks is to force re-run the task even though the cached input/output seems to be up to date.

Typical output:

[ant:cap] [ INFO: ] Converter [v3.0.5]
[ant:cap] [ INFO: ]     Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
[ant:cap]     
[ant:cap]     
[ant:cap] [ INFO: ] conversion completed with 0 errors and 0 warnings.
[ant:verify] XII 10, 2017 10:45:05 ODP.  
[ant:verify] INFO: Verifier [v3.0.5]
[ant:verify] XII 10, 2017 10:45:05 ODP.  
[ant:verify] INFO:     Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
[ant:verify]     
[ant:verify]     
[ant:verify] XII 10, 2017 10:45:05 ODP.  
[ant:verify] INFO: Verifying CAP file /Users/dusanklinec/workspace/jcard/applet/out/cap/applet.cap
[ant:verify] javacard/framework/Applet
[ant:verify] XII 10, 2017 10:45:05 ODP.  
[ant:verify] INFO: Verification completed with 0 warnings and 0 errors.

./gradlew test --info --rerun-tasks

Output:

Running test: Test method hello(AppletTest)

Gradle suite > Gradle test > AppletTest.hello STANDARD_OUT
    Connecting to card... Done.
    --> [00C00000080000000000000000] 13
    <-- 51373E8B6FDEC284DB569204CA13D2CAA23BD1D85DCAB02A0E3D50461E73F1BB 9000 (32)
    ResponseAPDU: 34 bytes, SW=9000

This project uses mainly:

• https://github.com/bertrandmartel/javacard-gradle-plugin
• https://github.com/martinpaljak/ant-javacard
• https://github.com/martinpaljak/oracle_javacard_sdks
• https://github.com/licel/jcardsim
• Petr Svenda scripts

Big kudos for a great work!

Thanks to Martin Paljak's ant-javacard and oracle_javacard_sdks we support:

• JavaCard 2.1.2
• JavaCard 2.2.1
• JavaCard 2.2.2
• JavaCard 3.0.3
• JavaCard 3.0.4
• JavaCard 3.0.5u1

This is a nice benefit of the IntelliJ Idea - gives you coverage results out of the box.

You can see the test coverage on your applet code.

• Go to Gradle plugin in IntelliJ Idea
• Tasks -> verification -> test
• Right click - run with coverage.

Coverage summary:

Coverage code:

If you experience the following error:

java.lang.VerifyError: Expecting a stackmap frame at branch target 19
    Exception Details:
      Location:
        javacard/framework/APDU.<init>(Z)V @11: ifeq
      Reason:
        Expected stackmap frame at this location.

Then try running JVM with -noverify option.

In the IntelliJ Idea this can be configured in the top tool bar with run configurations combo box -> click -> Edit Configurations -> VM Options.

TODOs for this project:

• Polish Gradle build scripts
• Add basic libraries as maven dependency.

Community feedback is highly appreciated - pull requests are welcome!