# On-Device Debugging And JUnit 5

DevFeed: [On-Device Debugging And JUnit 5](<https://devfeed.tech/articles/on-device-debugging-and-junit-5-19285.md>)

Original publisher: [Read original article](<https://www.codenameone.com/blog/developer-workflow-debug-and-junit/>)

Author: Shai Almog

Published: 2026-05-30T00:00:00Z

Content type: tutorial

Language: en

Sources: [CodeName One](<https://devfeed.tech/sources/codename-one.md>)

Topics: [debugging](<https://devfeed.tech/topics/debugging.md>), [IntelliJ IDEA](<https://devfeed.tech/topics/intellij-idea.md>), [Android](<https://devfeed.tech/topics/android.md>), [iOS](<https://devfeed.tech/topics/ios.md>), [ide](<https://devfeed.tech/topics/ide.md>), [simulator](<https://devfeed.tech/topics/simulator.md>), [Tooling](<https://devfeed.tech/topics/tooling.md>), [Code](<https://devfeed.tech/topics/code.md>), [Emulator](<https://devfeed.tech/topics/emulator.md>), [SDK](<https://devfeed.tech/topics/sdk.md>), [Visual Studio Code](<https://devfeed.tech/topics/visual-studio-code.md>)

Tags: [android](<https://devfeed.tech/tags/android.md>), [android-apps](<https://devfeed.tech/tags/android-apps.md>), [android-studio](<https://devfeed.tech/tags/android-studio.md>), [apk](<https://devfeed.tech/tags/apk.md>), [app](<https://devfeed.tech/tags/app.md>), [breakpoint](<https://devfeed.tech/tags/breakpoint.md>), [build](<https://devfeed.tech/tags/build.md>), [code](<https://devfeed.tech/tags/code.md>), [debugging](<https://devfeed.tech/tags/debugging.md>), [developer](<https://devfeed.tech/tags/developer.md>), [emulator](<https://devfeed.tech/tags/emulator.md>), [ide](<https://devfeed.tech/tags/ide.md>), [intellij](<https://devfeed.tech/tags/intellij.md>), [intellij-idea](<https://devfeed.tech/tags/intellij-idea.md>), [ios](<https://devfeed.tech/tags/ios.md>), [java](<https://devfeed.tech/tags/java.md>), [junit](<https://devfeed.tech/tags/junit.md>), [linux](<https://devfeed.tech/tags/linux.md>), [on-device](<https://devfeed.tech/tags/on-device.md>), [simulator](<https://devfeed.tech/tags/simulator.md>)

## AI overview

This tutorial describes Codename One's new JDWP-based on-device debugging for ParparVM iOS and Android apps. It explains debugging Java code and objects on simulators and physical devices using IntelliJ IDEA or other JDWP-speaking debuggers, and briefly covers standard JUnit 5 integration with the JavaSE simulator.

## Source excerpt

A walk-through of the new JDWP-based on-device debugging pipeline for ParparVM iOS apps and Android apps, with a step-by-step IntelliJ tutorial for each, and a short tutorial on the new standard JUnit 5 integration against the JavaSE simulator.