STMicroelectronics and IS2T’s STM32Java was an embedded Java development environment built around MicroEJ technology, with Java platforms tailored to supported STM32 microcontrollers and their board peripherals. The historical STM3220G-JAVA and STM3240G-JAVA evaluation kits are now marked obsolete and out of production by ST; they are not current board recommendations. MicroEJ documents support for a range of STM32 families today, but an exact device, release, and license must be confirmed with the vendor.
What STM32Java was
STM32Java was a Java toolchain and platform for developing embedded applications on specifically supported STM32 hardware. MicroEJ describes it as including an IDE, Java compiler, STM32-optimized Java platforms, standard libraries, and related tools. The workflow included PC simulation and graphical-interface tooling, as well as lightweight Java/C interoperability libraries. Those capabilities depended on features implemented on supported hardware: the fact that a chip is an STM32 does not by itself mean it can run an STM32Java application.
ST’s general STM32 IDE information mentions Java among languages available across its wider ecosystem, alongside C, C++, and Pascal. That broad statement does not establish that every Java IDE or workflow supports every STM32 part. STM32Java was a distinct, hardware-dependent path, not a feature supplied by every STM32 development setup.
What came with the STM3220G-JAVA evaluation kit
ST described the STM3220G-JAVA as a platform for evaluating embedded Java development on STM32F2-series microcontrollers. The kit paired an STM3220G-EVAL board with a DVD-ROM containing an evaluation version of the STM32Java SDK based on MicroEJ. Its demo ran on an STM32F207IGH6. ST now lists the kit as obsolete and out of production. STMicroelectronics: STM3220G-JAVA
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCrashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minute#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
The kit’s documented Java Platform Features connected software capabilities to the board’s built-in hardware:
- Display and user interface: a 3.2-inch, 240 × 320 color TFT touchscreen, MicroUI for HMI applications, and Micro Widget Toolkit.
- Networking: Ethernet with an integrated TCP/IP stack and sockets.
- Communication and integration: RS-232 USART communication and SNI/SP interfaces between Java and C.
- Physical controls: a four-direction joystick, selector, wakeup/tamper/user buttons, and four color LEDs.
- Development hardware: embedded ST-LINK/V2.
These were features of the documented evaluation platform; they should not be assumed for other STM32 boards or devices.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
The related STM3240G-JAVA kit
ST also offered the STM3240G-JAVA for evaluating Java on STM32F4. It used an STM3240G-EVAL board, with its demo programmed on an STM32F407IGH6. ST’s feature list was similar to the F2 kit and also noted hardware floating-point support. ST marks this product obsolete and out of production as well. STMicroelectronics: STM3240G-JAVA
Are the Java evaluation kits still available?
As of October 4, 2026, ST’s product pages classify both named kits as “Obsolete” and “Out of Production.” That is the lifecycle status shown by the manufacturer; it does not determine whether an individual used kit might appear through a reseller. Treat any such listing as used historical hardware and verify its condition, included accessories, and software media directly with the seller. The old evaluation-kit status also says nothing about current MicroEJ licensing.
Free tools Windows power users keep installed
One-click scans. No signup required.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
ST’s historical terms for the evaluation software included with these kits limited use to three months from first launch and one hour of runtime. Those limits apply to the kit’s evaluation version, not to current MicroEJ offerings. ST’s STM3220G-JAVA product page and STM3240G-JAVA product page
Can Java run on an STM32 today?
Potentially, but compatibility is specific to the MCU, platform release, and hardware configuration. MicroEJ’s supported-hardware page lists examples across STM32F0, F2, F4, F7, L0, L4, U5, G0, G4, H7, WB, and WL families, among others. A family appearing on that page is not proof that every part number, peripheral, or release is supported. Check the exact MCU and intended release with MicroEJ before choosing hardware. MicroEJ Developer: Supported Embedded Platforms
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
For a current STM32 project, ST’s mainstream STM32Cube ecosystem is a separate route. Series-dependent STM32Cube MCU/MPU packages include HAL and LL APIs and middleware, while STM32CubeMX generates initialization code. These tools provide context for standard STM32 development, but they are not the STM32Java SDK. STM32Cube MCU & MPU Packages · STM32 software development tools
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to evaluate a present-day STM32Java path
Before selecting a board or committing to a Java-based embedded design, confirm the points that made the legacy kits specific rather than universally applicable:
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
- Exact MCU and release: ask MicroEJ whether the precise STM32 part number is supported by the intended platform and software release.
- Board peripherals: compare the required display, touch input, network, serial interfaces, and controls with the actual board. The old evaluation kits’ peripheral lists do not describe current hardware.
- Application workflow: establish whether the available IDE, compiler, simulation, GUI tools, libraries, and Java/C integration match the project’s needs.
- Lifecycle and licensing: obtain current terms and product availability from MicroEJ; the three-month and one-hour limitations documented for ST’s historical evaluation software are not current-license terms.
- Alternative STM32 development: if the project does not require Java, assess the appropriate STM32Cube package, HAL/LL APIs, and middleware for the target MCU series.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
