What is an incompatible magic value?

Reported where?

Your Java Runtime Environment is corrupted.

In a pop-up dialog box on the video console. So far it's only happened after a day or two of uptime.

Any hints how to sort this out? It seems that the corruption must be developing somewhere in the executing binaries in memory; fresh off the microSD card things work fine....

There've been a few other mysterious developments, lxterminal windows vanishing without comment when clicked in the text area among them.

The boot microSD was set up some time (months) ago and kept un-updated after I discovered that updates were not compatible with the Owon software. I've got a Pi5 running bookworm that _is_ updated and I check occasionaly to see if it works with the 'scope. So far, it hasn't.

The Owon software is from

Thanks for writing!

bob prohaska

There might be more information in the kernel log, readable with: sudo journalctl -ke

I suspect a hardware issue. The uSD card is a common source of trouble, they have a bit of a habit of wearing out, though other components can fail too.

For the kernel: uname -a

For Debian (including the Pi OS) the current distribution version is usually captured in /etc/debian_version, although this is very coarse grained. You can get version information about the installed packages with: dpkg -l

Can’t find any matches on that value (in either decimal or hex), so I think it’s just simple file corruption, rather than confusion with a file in the wrong format. The “magic” value that identifies a .jar file is supposed to be 3405691582, or “CAFEBABE” in hex (geek humour).