JOSM consume 100% CPU for no apprent reason

[francois.lacombe]

What steps will reproduce the problem?

This issue occurs often on my computer, but really hard to reproduce.
It can independently happen when editing with several image layers and plugin or on the welcome screen with several minutes of idle activity.

What is the expected result?

JOSM shouldn't consume 100% 8-core CPU full time

What happens instead?

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

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2019-12-01 23:10:15 +0100 (Sun, 01 Dec 2019)
Revision:15553
Build-Date:2019-12-02 02:30:57
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (15553 fr) Linux Debian GNU/Linux 10 (buster)
Memory Usage: 1182 MB / 3996 MB (725 MB allocated, but free)
Java version: 11.0.5+10-post-Debian-1deb10u1, Debian, OpenJDK 64-Bit Server VM
Screen: :0.0 1920x1200, :0.1 1920x1200, :0.2 1920x1200
Maximum Screen Size: 1920x1200
Java package: openjdk-11-jre:amd64-11.0.5+10-1~deb10u1
Java ATK Wrapper package: libatk-wrapper-java:all-0.33.3-22
fonts-noto: fonts-noto:all-20181227-1
VM arguments: [-Djosm.restart=true, -Djava.net.useSystemProxies=true]

Plugins:
+ apache-commons (35092)
+ buildings_tools (35171)
+ ejml (35122)
+ geotools (35169)
+ http2 (35062)
+ jaxb (35014)
+ jts (35122)
+ opendata (35179)
+ utilsplugin2 (35238)

Map paint styles:
+ /data/OpenStreetMap/Modele Power/Style/osm_power_josm_fr.mapcss

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.
- W: java.net.http.HttpTimeoutException: request timed out

[francois.lacombe]

JOSM report

[Don-vip]

Closed as duplicate of #17921.
Took me about 20 seconds to figure what it is once I read your status report :p Please either remove http2 plugin or upgrade to Java 13.

[francois.lacombe]

Thanks Vincent, I didn't knew http2 support was inly experimental
I've removed httpd2 plugin and josm works well now. I'll see if I go for java 13 in a few days

All the best :)