Opened 6 years ago

Last modified 5 months ago

#10213 reopened defect

JOSM should have by default 512 MB or more

Reported by: baditaflorin Owned by: team
Priority: normal Milestone:
Component: Core Webstart Version: tested
Keywords: template_report Cc:


With the new Java7 switch, if i open BING, Mapbox and Mapnik Layer, and i download one or 2 layers of data to work with, i get really fast JOSM is out of memory, and if i try to sae a file, it will sometimes save it partially, leading to a corrupt file

What steps will reproduce the problem?

What is the expected result?

What happens instead?

Please provide any additional information below. Attach a screenshot if

Repository Root:
Build-Date: 2014-05-26 07:29:16
Last Changed Author: akks
Revision: 7182
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last Changed Date: 2014-05-26 09:22:25 +0200 (Mon, 26 May 2014)
Last Changed Rev: 7182

Identification: JOSM/1.5 (7182 en) Windows 7 64-Bit
Memory Usage: 247 MB / 247 MB (6 MB allocated, but free)
Java version: 1.7.0_55, Oracle Corporation, Java HotSpot(TM) Client VM
VM arguments: [\Program Files (x86)\Java\jre7\lib\security\javaws.policy, -DtrustProxy=true, -Xverify:remote, -Djnlpx.home=<java.home>\bin, -Djnlpx.origFilenameArg=C:\Users\florin\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\56\1ee8cfb8-6679a95c, -Djnlpx.remove=false, -Dsun.awt.warmup=true, -Xbootclasspath/a:C:\Program Files (x86)\Java\jre7\lib\javaws.jar;C:\Program Files (x86)\Java\jre7\lib\deploy.jar;C:\Program Files (x86)\Java\jre7\lib\plugin.jar, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.splashport=52721, -Djnlp.application.href=, -Djnlpx.jvm=<java.home>\bin\javaw.exe, -Djnlpx.vmargs=-Djava.util.Arrays.useLegacyMergeSort=true -Djnlp.application.href=]
Dataset consistency test: No problems found

Plugin: AddrInterpolation (30416)
Plugin: FastDraw (30416)
Plugin: HouseNumberTaggingTool (30416)
Plugin: ImportImagePlugin (30416)
Plugin: OpeningHoursEditor (30416)
Plugin: SimplifyArea (30416)
Plugin: alignways (30416)
Plugin: buildings_tools (30485)
Plugin: conflation (0.1.7)
Plugin: geotools (30416)
Plugin: jts (30416)
Plugin: log4j (30416)
Plugin: merge-overlap (30416)
Plugin: opendata (30436)
Plugin: print (30416)
Plugin: terracer (30416)
Plugin: turnrestrictions (30454)
Plugin: utilsplugin2 (30460)
Plugin: walkingpapers (30416)

Attachments (0)

Change History (8)

comment:1 Changed 6 years ago by anonymous

Summary: JOSM should have but default 512 MB or moreJOSM should have by default 512 MB or more

comment:2 Changed 6 years ago by bastiK

This is not possible as webstart is also used on older machines. You can download the jar file and add an option at start: java -Xmx500m -jar josm.jar

comment:3 Changed 6 years ago by bastiK

Resolution: wontfix
Status: newclosed

comment:4 Changed 6 years ago by Klumbumbus

Or you use the .jnlp file and change in a text editor the line

<j2se version="1.6+"/>


<j2se version="1.6+" initial-heap-size="256m" max-heap-size="768m"/>

(or other values for initial-heap-size and max-heap-size)

Last edited 6 years ago by Klumbumbus (previous) (diff)

comment:5 Changed 4 years ago by anonymous

Resolution: wontfix
Status: closedreopened

I suggest to provide some alternative download links on, which already include larger values for max-heap-size (like 1GB, 2GB, ..). This way, the original 512MB is retained, while it allows for larger heap sizes without any manual file fiddling.

Rationale: Asking a user to download .jnlp and manually editing the file may be too much for some users, see:

comment:6 Changed 4 years ago by skyper

Did not try it with webstart but running .jar-files on Linux the java environment is providing more memory if the system has plenty. So, this might be better fixed within java by a smarter default setting depending on the available memory and not by every executable itself.

comment:7 Changed 4 years ago by anonymous

@skypet: setting the max heap size in the jnlp file (a text file!) works on any os, not just Linux. It is just a matter of providing a suitable jnlp file according to what a user wants to run.

comment:8 Changed 5 months ago by Don-vip

Component: CoreCore Webstart

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