XML Language Server Crashes Due to an Out Of Memory Error

[itchozyn]

WHen I start VSCode after the latest update, XML Server crashes. Full Output text from "XML Support":

[Info - 10:40:14 AM] Oct 10, 2025 10:40:14 org.eclipse.lemminx.XMLLanguageServer initialize()
Message: Initializing XML Language server
LemMinX Server info:

• Version : 0.31.0
• Java : C:\Program Files\Java\jdk-21
• VM Version : 21.0.8
• Git de7f529 - [maven-release-plugin] prepare release 0.31.0
  [Info - 10:40:37 AM] Oct 10, 2025 10:40:36 org.eclipse.lemminx.extensions.contentmodel.uriresolver.XMLCatalogResolverExtension setCatalogs()
  Message: Adding XML catalog 'c:\Users<snipped>.vscode\extensions\salesforce.salesforcedx-vscode-core-64.17.2\resources\metadata-catalog.xml' with expand system id 'file:///c:/Users//.vscode/extensions/salesforce.salesforcedx-vscode-core-64.17.2/resources/metadata-catalog.xml' and root URI 'file:///c%3A/Users//Documents/newITBatch/'.
  [Info - 10:40:37 AM] Oct 10, 2025 10:40:36 org.eclipse.lemminx.extensions.contentmodel.uriresolver.XMLCatalogResolverExtension setCatalogs()
  Message: Adding XML catalog 'c:\Users<snipped>.vscode\extensions\salesforce.salesforcedx-vscode-lwc-64.17.2\resources\static\js-meta-home.xml' with expand system id 'file:///c:/Users//.vscode/extensions/salesforce.salesforcedx-vscode-lwc-64.17.2/resources/static/js-meta-home.xml' and root URI 'file:///c%3A/Users//Documents/newITBatch/'.
  [Error - 10:40:40 AM] Connection to server got closed. Server will not be restarted.

VSCode About:
Version: 1.105.0 (user setup)
Commit: 03c265b1adee71ac88f833e065f7bb956b60550a
Date: 2025-10-08T14:09:35.891Z
Electron: 37.6.0
ElectronBuildId: 12502201
Chromium: 138.0.7204.251
Node.js: 22.19.0
V8: 13.8.258.32-electron.0
OS: Windows_NT arm64 10.0.26100

[datho7561]

Is this happening after the latest update of VS Code? We haven't released a new version of vscode-xml in a while.

There's nothing in the logs here that can help us to figure out when wrong, unfortunately.

Were you trying to edit a large XML file? Did you try changing the memory allocated to the extension through modifying the setting xml.server.vmargs? (eg. adding -Xmx1G will increase the memory allow to be used to 1 gigabyte).

It could be specific to running Windows arm64, I don't think that we have access to a Windows arm64 machine to test it, unfortunately.

[itchozyn]

Yes, it started after the last update. I am only developing for Salesforce in Apex right now. Each Salesforce file has an associated XML file with its metadata settings. But none of them are very large and I usually do not edit them directly. Perhaps VSCode does make changes to them when I update the files, but I don't know.

I specified 512MB for the xml.server.vmargs, but it still crashed. I then switched to the binary server and it works.

I would agree that this new ARM processor architecture has issues with otherwise stable apps.

[fgarciachipi]

I'm having the same problem in a Apple M1 ARM processor. Increasing memory didn't fixed it.

[angelozerr]

Even with binary mode?