Haven error! at launch.

[alexmateko]

Was using the official client.

PC has:
Intel HD Graphics (MSI)
1950W (91336x768@60Hz)
4 Gb DDR 3
Intel G530 CPU

Game worked fine on Windows 7.
It was upgraded to Windows 10 then gave an error at launch with a white Java window:

Haven error!
The error report could not be processed because of the following error:
java.lang.ClassNotFoundException: haven.GLconfig$HardwareException

All drivers were updated.
Java was freshly installed.
Other games worked normally.

Rolled back to Windows 7.
The same error came up.

Tried getting openGL, direcX, openAL, .NET Framework
Tried everything possible short of taking Ayahuasca and praying to the Machine Spirit.
Nothing worked.
Currently building an altar.

If anybody has any ideas, please share them.
The copper and neodymium idols are really expensive and the altar is already taking up half of my room.

[luarocks]

I'm not sure about all clients but most of them require exactly Oracle Java 8. Any other versions will not work. Probably you installed Java 10 or something. Check the version in terminal by typing java -version. It should be like 1.8.0_241.

[MagicManICT]

I'm not sure about all clients but most of them require exactly Oracle Java 8.

The new client (which you access via the "Play" button now) is supposed to support all Java versions 8 or newer. I believe loftar said he is running with OpenJDK 9 (I'll have to double check that to be sure.)

Game worked fine on Windows 7.
It was upgraded to Windows 10 then gave an error at launch with a white Java window:

Odds are, a 32-bit build of Java is installed. Upgrading this to a 64-bit build (assuming a 64-bit operating system is installed) should fix the issue. You can download the version of java you want manually: https://java.com/en/download/manual.jsp

Also, there is an update to the "minimum specs" with this most recent update. GPUs need OpenGL 3.0+ support. If I'm finding the correct information for the CPU and integrated graphics, you should be fine, however, 32-bit drivers that support OpenGL properly may not be available.

The old client is still available to use on a limited time basis, at least long enough for the client modders to get their code updated to the changes. It can be found here: http://game.havenandhearth.com/java/old-launcher.jar