Can't input Korean Character(한글) in the text field

[ray4167@…]

What steps will reproduce the problem?

ex) Presets->Annotation->Address->addr:city

What is the expected result?

Can't type Korean

What happens instead?

Can't type Korean

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

It isn't certain that whether this is the problem of my IME(fcitx) or JOSM.
I'm using default IME of Ubuntu, fcitx.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2018-01-28 23:08:56 +0100 (Sun, 28 Jan 2018)
Build-Date:2018-01-28 22:25:44
Revision:13367
Relative:URL: ^/trunk

Identification: JOSM/1.5 (13367 en) Linux Ubuntu 17.10
Memory Usage: 469 MB / 1300 MB (324 MB allocated, but free)
Java version: 1.8.0_151-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: :0.0 1366x768
Maximum Screen Size: 1366x768
VM arguments: [-Djava.security.policy=file:${JAVA_HOME}/jre/lib/security/javaws.policy, -DtrustProxy=true, -Djnlpx.home=${JAVA_HOME}/jre/bin, -Djava.security.manager, -Djnlpx.origFilenameArg=${HOME}/.java/deployment/cache/6.0/56/1ee8cfb8-1e76715c, -Djnlpx.remove=false, -Dsun.awt.warmup=true, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.splashport=54473, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp, -Djnlpx.jvm=${JAVA_HOME}/jre/bin/java]

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.

[Don-vip]

We do nothing fancy concerning character input. The issue either comes from your IME or the ​OpenJDK Debian package.

[bastiK]

ray, this input field has autocompletion, which might possibly interfere with fcitx. You can try again in a plain input field (e.g. Preferences > GPS points > drawing width of GPX lines) or another Java application. If it works in any of those, then it would be a JOSM bug.

[Don-vip]

Maybe you're right it looks like #15825