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Flutter doctor: No Java Development Kit (JDK) found on Windows 11

The problem: When you run flutter doctor, you get a “no Java Development Kit (JDK) found” error:

The solution: Install a Java Development Kit, then set the environment variables

Download and install a JDK

The download link given by flutter doctor didn’t work when I tried it, but this one did.

Download the file and run the installer.

Add the JAVA_HOME environment variable and update the PATH

Now for the “fun” part: You may have to manually edit the JAVA_HOME and PATH environment variables on your Windows system. In the example below, I’m using JDK19. Please make sure to adapt the instructions so they match your particular setup.

Locate your JDK installation directory. The default path is usually C:\Program Files\Java\jdk-19, but it can vary depending on your installation settings. Make sure to copy this path for later use.
Right-click on the Windows Start button and select System.
In the System window, click on Advanced system settings:

In the System Properties window, click on the Environment Variables button near the bottom right:

Under System variables, click on the New button.
Enter the variable name JAVA_HOME. As the variable value, enter the path to your JDK installation directory from the first step:

For example, if your JDK is installed in C:\Program Files\Java\jdk-19, then the value should be C:\Program Files\Java\jdk-19.

Click OK to save the new environment variable.
In the System Variables list, locate the Path variable, and click Edit.
In the Edit environment variable window, click New, and add %JAVA_HOME%\bin to the list. This ensures that the JDK executables are available in your system’s PATH.

Click OK to save the changes to the Path variable, and close all remaining windows by clicking OK as well.

Please keep in mind that you will need to open a new Command Prompt window for the changes to take effect, as the environment variables are loaded when the Command Prompt is launched.

To verify the changes, you can run echo %JAVA_HOME% in a new Command Prompt window. This should display the path to your JDK installation directory. Running java -version should display the version information of your JDK 19 installation.

Finally, running flutter doctor should show that the “No Java Development Kit (JDK) found” error has disappeared:

DaVinci Control Panels app crashes? Try installing it on a different computer

Whenever DaVinci Resolve notifies me that a new firmware is available for the Speed Editor, the following happens:

I open the DaVinci Control Panels software.
It shows up like this for a few seconds (at most) and then disappears (crashes):

DaVinci Control Panels app showing a blank window before crashing

I was unable to resolve this problem on my PC. Instead, I’ve installed the Control Panels application on a different computer, where it worked just fine:

Unfortunately this required installing DaVinci Resolve, too, which can take a while. It would be nice if Blackmagic made the Control Panels app available as a separate download.

This post is mainly meant to remind me to simply use this method the next time I want to do a firmware update. If you don’t like it, you can always try to get help on the official DaVinci Resolve forum.

Change the keyboard for an existing language in Windows 11

The problem: You’ve added several languages with different keyboard layouts to Windows 11.

Windows 11 language bar showing multiple languages with different keyboards

However, you want all of them to use the same keyboard (in this example “United States-International”).

The solution

In the language bar, click on More keyboard settings (or go to Settings > Time & language > Language & region).

Click on the three dots on the right of the language you want to change and choose Language options:

Windows 11 Language & region settings: Language options

Under Keyboards, click on Add a keyboard and add the keyboard you want:

Windows 11 Language & region settings > Language options: Add a keyboard

Finally, remove the original keyboard:

Windows 11 Language & region settings > Language options: Remove a keyboard

Your language bar should now show multiple languages with the same keyboard:

Windows 11 language bar showing multiple languages with the same keyboard

A user-friendly desktop wallet for Namecoin (NMC)?

Yes, such a wallet exists, though it is still in beta: AtomicDEX (desktop version only) supports Namecoin (NMC).

You can even use the built-in “atomic swap” feature to trade your NMC, for example, for Komodo (KMD), which you can hold in the wallet and collect rewards or sell on many popular exchanges like Binance (affiliate link). Make sure you read the instructions first (found under Support). The atomic swap protocol requires that the maker and taker stay online and monitor the blockchains involved.

Exchanges which accept Namecoin can be found here.

Bootstrap file to synchronize your Dogecoin Core wallet faster

Update February 28, 2021: Dogecoin Core 1.14.3 has been released and significantly improves the synchronization speed. The method described in the original post below is no longer be necessary.

This article assumes that you have backed up your wallet and updated to the most recent version of Dogecoin Core (currently 1.14.2).

At the time of writing, you can get a torrent here which contains blocks until January 29, 2021. Note that it is not a single Bootstrap.dat file, instead it contains the blocks and chainstate directory.

You can find further information on the Dogecoin Discord (in the FAQ section), the Dogecoin Core GitHub and the Dogecoin subreddit.

Once synchronized, consider forwarding port 22556 to help the network. This should give you over a hundred connections instead of the usual 8:

This will, of course, create significant network activity as can be seen in Dogecoin Core under Help > Debug window > Network traffic. This is my traffic from just two days:

Interested in buying or selling Dogecoin? Take a look at Binance (affiliate link) , Bitpanda (affliate link) or Crypto.com (affiliate link).

Edit: My Dogecoin wallet on a PC that was running 24/7 still went out of sync multiple times:

Let’s not forget that Dogecoin was created as a joke.

Edit 2: I do not recommend using the full node wallet (version 1.14.2) if you’re just getting started with Dogecoin. Consider using a simple mobile wallet like Trust Wallet.