error while installing josm-tested.jar (Version 19555)

[urk@…]

While installing josm-tested.jar (Version 19555) after download: pop-up window "A Java Exception has occured".
Newly installed Java version:
java version "1.8.0_491"
Java(TM) SE Runtime Environment (build 1.8.0_491-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.491-b10, mixed mode)

[stoecker]

Thanks for your report, however your ticket is incomplete and therefore not helpful in its current form.

Please add all needed information according to this list:

• The required parts of the Status Report from your JOSM.
  • Please, use Report Bug from Help menu and copy & paste.
• Describe what behaviour you expected.
• Describe what did happen instead.
• Describe if and how the issue is reproducible.
• Add any relevant information like error messages or screenshots.

To ensure that all technical relevant information is contained, create new tickets by clicking in JOSMs Main Menu on Help → Report Bug.

Remember: This is a generic notice so we don't need to write the same stuff again and again. It may only apply in parts to the specific case!

[urk@…]

Hi stoecker,
Status Report from JOSM is not available because the installation of JOSM failed.
Describe what behaviour you expected: I expected that JOSM installation would be finished successfully.
Describe what did happen instead: Installation of JOSM aborted with the pop-up window "A Java Exception has occured".
Describe if and how the issue is reproducible: I tried multiple times to replace JOSM 19481 by JOSM 19555 starting josm-tested.jar (Version 19555).

[stoecker]

Usually the software not only says "A Java Exception has occured", but actually WHICH exception occurred. Without the details the report isn't helpful.

[anonymous]

There is and there was no specific output, WHICH exception occurred. Pls see the enclosed screen copy.

[stoecker]

Boah, what a broken software doesn't output a useful error message...

Anyway if that is really true: "Java(TM) SE Runtime Environment (build 1.8.0_491-b10)" then your problem is that you try to run JOSM with a Java version which is no longer supported for some years. You need Java 11 minimum.

Typically java should tell you that it does not support class file version 55.0 (which is Java 11), but only <= 52.0 (which is Java 8). It's strange, that you get only such a useless error message.

I suggest you install the Windows MSI, which contains a proper Java version.