Matlab matlab.addons.installedAddons uses Java when not using feature('webui') (The New Desktop mandatory in R2025a)

Readme.md

matlab.addons.installedAddons can use Java in Matlab < R2025a

One might use matlab.addons.installedAddons to check if a Matlab package is installed. However, if not using the "New Desktop" such that feature('webui') is true, Java is invoked by this function, which might fail. Matlab R2025a always uses feature('webui') so you're good. Matlab R2024b and older might not be using the New Desktop, which was not installed by default.

matlab.addons.installedAddons.log

# Error experienced with Matlab R2024b on macOS that was not using the New Desktop 
# feature('webui') == false

Error using getInstalledAddOns (line 31)
Java exception occurred:
java.lang.UnsatisfiedLinkError:
com.mathworks.connector.message_service.api.JniMessageServiceAdaptor.doStart()V
	at
    com.mathworks.connector.message_service.api.JniMessageServiceAdaptor.doStart(Native
    Method)
	at
    com.mathworks.connector.message_service.api.JniMessageServiceAdaptor.start(JniMessageServiceAdaptor.java:27)
	at
    com.mathworks.matlabserver.connector.impl.ConnectorImpl.startMessageService(ConnectorImpl.java:523)
	at
    com.mathworks.matlabserver.connector.impl.ConnectorImpl.doStart(ConnectorImpl.java:413)
	at
    com.mathworks.matlabserver.connector.impl.ConnectorImpl.doEnsureServiceOn(ConnectorImpl.java:237)
	at
    com.mathworks.matlabserver.connector.api.Connector.ensureServiceOn(Connector.java:150)
	at
    com.mathworks.addons_common.notificationframework.UnifiedUninstallerHelper.<init>(UnifiedUninstallerHelper.java:28)
	at
    com.mathworks.addons_common.notificationframework.UnifiedUninstallerHelper.initialize(UnifiedUninstallerHelper.java:35)
	at
    com.mathworks.addons_common.notificationframework.InstalledAddOnsCache.<init>(InstalledAddOnsCache.java:38)
	at
    com.mathworks.addons_common.notificationframework.InstalledAddOnsCache.<init>(InstalledAddOnsCache.java:29)
	at
    com.mathworks.addons_common.notificationframework.InstalledAddOnsCache$LazyHolder.<clinit>(InstalledAddOnsCache.java:52)
	at
    com.mathworks.addons_common.notificationframework.InstalledAddOnsCache.getInstance(InstalledAddOnsCache.java:56)

Error in matlab.addons.installedAddons (line 36)
    addons = getInstalledAddOns();
             ^^^^^^^^^^^^^^^^^^^^
Error in <snip>
addons = matlab.addons.installedAddons;
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Exception in thread "connector": org.apache.commons.lang.NotImplementedException: Connector is not running. Use Connector.ensureServiceOn() to ensure it is running before using it.
	at com.mathworks.messageservice.MessageServiceFactory.getBuilder(MessageServiceFactory.java:39)
	at com.mathworks.messageservice.MessageServiceFactory.getMessageService(MessageServiceFactory.java:17)
	at com.mathworks.peermodel.synchronizer.utils.PeerModelInitialize.initialize(PeerModelInitialize.java:20)
	at com.mathworks.matlabserver.connector.impl.ConnectorImpl.startPeerModel(ConnectorImpl.java:528)
	at com.mathworks.matlabserver.connector.impl.ConnectorImpl.doStart(ConnectorImpl.java:414)
	at com.mathworks.matlabserver.connector.impl.ConnectorImpl$1.lambda$run$0(ConnectorImpl.java:194)
exit status 1