How increase allocated memory when using JOSM webstart?

[iman]

Hi, I'm on Windows 7 with the latest Java installed. I've installed JOSM using "josm.jnlp" Webstart.

When I add -Xmx1024M to the target path of JOSM shortcut, like this:

"C:\Program Files\Java\jre1.8.0_161\bin\javaws.exe" -Xmx1024M -localfile -J-Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp "C:\Users\UserName\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\56\1ee8cfb8-6314d71c"

the allocated memory doesn't change. How may I do this?

There is no problem with "josm-tested.jar" and adding -Xmx1024M will work.

[Hb---]

Are the JAVA run options case sensitive? Did you check https://josm.openstreetmap.de/wiki/Help/CommandLineOptions ?

[Don-vip]

Applet has been dropped years ago. Please don't use this component.

[anonymous]

Replying to Hb---:

Are the JAVA run options case sensitive? Did you check https://josm.openstreetmap.de/wiki/Help/CommandLineOptions ?

Not sure, maybe not. I tried -Xmx1024m, but no luck.

As mentioned at ​JNLP File Syntax I modified the josm.jnlp file in one of these ways and memory allocation worked:

• Adding -Xmx1024m argument to java-vm-args.
• Adding max-heap-size=1024M attribute to java element (<java version="1.8+" max-heap-size=1024M java-vm-args="..."/>)

Then I cannot use shortcut on desktop and should open josm.jnlp directly. This is what I've totally found out.

[Hb---]

Replying to comment 2:

Applet has been dropped years ago.

Clicking Launch josm.jnlp on / under Windows 7 creates as side effect two JOSM.lnk files. One as Desktop icon and the second as Start Menu item in C:\Users\<user>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\JOSM\. These .lnk files have the target "C:\Program Files\Java\jre1.8.0_161\bin\javaws.exe" -localfile -J-Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp "C:\Users\<user>\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\56\1ee8cfb8-507a5420"

Aside from OPs question: Will these links break after updating java because of the hard coded javaws location?

Replying to anonym:

As mentioned at ​JNLP File Syntax I modified the josm.jnlp file in one of these ways and memory allocation worked ...

Thanks for working that out. But it seems that we have easier options.

Then I cannot use shortcut on desktop and should open josm.jnlp directly. This is what I've totally found out.

I could control the memory used with:

1. Downloading the josm.jnlp file
2. Open a command prompt (As usually javaws.exe is found in the Path=)
3. Run javaws -J-Xmx2048m josm.jnlp

Placing a -J before each parameter makes javaws giving them to the virtual machine. Otherwise those parameters are only read by the WebLauncher.

Our Help does not handle this task right in Download#Doubleclickonafiledoesnothing currently. The -Xmx must be preceded by an own -J prefix and must not have an equation sign before the numeric value.

Please feel free to edit the wiki.

[anonymous]

Replying to Hb---:

I could control the memory used with:

1. Downloading the josm.jnlp file
2. Open a command prompt (As usually javaws.exe is found in the Path=)
3. Run javaws -J-Xmx2048m josm.jnlp

Placing a -J before each parameter makes javaws giving them to the virtual machine. Otherwise those parameters are only read by the WebLauncher.

I tried adding -J-Xmx1024m to the target path of the shortcut on desktop. Nothing happened. No run.

Replying to Hb---:

Are the JAVA run options case sensitive? Did you check https://josm.openstreetmap.de/wiki/Help/CommandLineOptions ?

Then I tried -J-Xmx1024M and it worked! I modified target of shortcut to:

"C:\Program Files\Java\jre1.8.0_161\bin\javaws.exe" -J-Xmx1024M -localfile -J-Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp "C:\Users\<UserName>\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\56\1ee8cfb8-6314d71c"

Thank you man!

[Don-vip]

mmm, this clearly needs to be documented :)

[Hb---]

See Help/CommandLineOptions@25

[richlv]

Not sure how to best put it in the wikipage, dropping info here for now in case it helps somebody.
On a Mac, when using webstart, I managed to change the memory limit by editing ~/Library/Application\ Support/Oracle/Java/Deployment/cache/6.0/bundles/JOSM.app/Contents/Info.plist.

There was a WebStartArgs key like this:

        <key>WebStartArgs</key>
        <array>
                <string>-localfile</string>
                <string>-online</string>
                <string>-J-Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp </string>
                <string>/Users/<username>/Library/Application Support/Oracle/Java/Deployment/cache/6.0/56/1ee8cfb8-615850a3</string>
        </array>

Added one line (6th; cannot get line highlighting to work) to make it look like this:

        <key>WebStartArgs</key>
        <array>
                <string>-localfile</string>
                <string>-online</string>
                <string>-J-Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp </string>
                <string>-J-Xmx3048M</string>
                <string>/Users/richlv/Library/Application Support/Oracle/Java/Deployment/cache/6.0/56/1ee8cfb8-615850a3</string>
        </array>

In JOSM, this can be validated by checking reported memory before/after changes in Help -> Show Status Report.

No idea how well will this survive upgrades, will see in a few weeks.

[Hb---]

Replying to richlv:

On a Mac, when using webstart, I managed to change the memory limit by ...

The current https://josm.openstreetmap.de/download/josm.jnlp line number 23 should be:
<java version="1.8+" max-heap-size="2048m" java-vm-args="--add-modules=java.activation,java.se.ee --add-exports=java.base/sun.security.util=ALL-UNNAMED --add-exports=java.base/sun.security.x509=ALL-UNNAMED --add-exports=java.desktop/com.apple.eawt=ALL-UNNAMED --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED --add-exports=javafx.graphics/com.sun.javafx.application=ALL-UNNAMED --add-exports=jdk.deploy/com.sun.deploy.config=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.nio=ALL-UNNAMED --add-opens=java.base/jdk.internal.loader=ALL-UNNAMED --add-opens=java.base/jdk.internal.ref=ALL-UNNAMED --add-opens=java.desktop/javax.imageio.spi=ALL-UNNAMED --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED"/>

Is this line present in the josm.jnlp file on your system?

So your editing would increase the heap from 2048 MB to 3048 MB?

[richlv]

Sorry, I'm I'm not sure where the jnlp file is by now.
Yes, 3048 is an obvious quick test by changing the first digit only :)

[Don-vip]

We can document this, but keep in mind Oracle Java WebStart is going away (end of 2020). We'll see with OpenWebStart how to configure things properly :)