InvalidPathException: Malformed input or input contains unmappable characters

[tadaben]

What steps will reproduce the problem?

1.Cntl-S
2.Error

What is the expected result?

Save file ( *.osm or *.geojson ...)

What happens instead?

unexpected exception occurred

Please provide any additional information below. Attach a screenshot if possible.

Revision:15553
Is-Local-Build:true
Build-Date:2019-12-04 16:53:16

Identification: JOSM/1.5 (15553 SVN ja) Linux Ubuntu 18.04.3 LTS
Memory Usage: 479 MB / 974 MB (138 MB allocated, but free)
Java version: 11.0.4+11-post-Ubuntu-1ubuntu218.04.3, Ubuntu, OpenJDK 64-Bit Server VM
Screen: :0.0 1366x768
Maximum Screen Size: 1366x768
VM arguments: [-Duser.home=${HOME}]
Dataset consistency test: No problems found

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.
- W: Region [WMS_BLOCK_v2] Resetting cache
- W: Region [WMTS_BLOCK_v2] Resetting cache
- E: Handled by bug report queue: java.nio.file.InvalidPathException: Malformed input or input contains unmappable characters: /home/<user.name>/������������������
- E: Handled by bug report queue: java.nio.file.InvalidPathException: Malformed input or input contains unmappable characters: /home/<user.name>/������������������


=== REPORTED CRASH DATA ===
BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: Basic L&F File Loading Thread (109)
java.nio.file.InvalidPathException: Malformed input or input contains unmappable characters: /home/tadaben/������������������
	at java.base/sun.nio.fs.UnixPath.encode(UnixPath.java:145)
	at java.base/sun.nio.fs.UnixPath.<init>(UnixPath.java:69)
	at java.base/sun.nio.fs.UnixFileSystem.getPath(UnixFileSystem.java:280)
	at java.base/java.nio.file.Path.of(Path.java:147)
	at java.base/java.nio.file.Paths.get(Paths.java:69)
	at java.desktop/sun.awt.shell.ShellFolder.getShellFolder(ShellFolder.java:247)
	at java.desktop/javax.swing.filechooser.FileSystemView.getFiles(FileSystemView.java:523)
	at java.desktop/javax.swing.plaf.basic.BasicDirectoryModel$FilesLoader.run0(BasicDirectoryModel.java:290)
	at java.desktop/javax.swing.plaf.basic.BasicDirectoryModel$FilesLoader.run(BasicDirectoryModel.java:279)
	at java.base/java.lang.Thread.run(Thread.java:834)

[Klumbumbus]

As quick workaround you could use "save as..." and choose a filename without special characters.

[Don-vip]

Closed as duplicate of #14596.
This is usually caused by a bad locale configuration. Check locale and LC_ALL configuration on your system, and #14596 on how to fix the issue.