Cannot launch JOSM through javaws - Provider org.apache.xerces.jaxp.validation.XMLSchemaFactory not found

[Wulf4096]

Hello,

I'm running debian unstable with openjdk 11.0.4 and icedtea-netx 1.7.2 and libxerces2-java 2.12.0

When trying to run josm, I get:

$ javaws josm.jnlp
Gtk-Message: 17:01:37.594: Failed to load module "canberra-gtk-module"
Gtk-Message: 17:01:39.142: Failed to load module "canberra-gtk-module"
Codebase matches codebase manifest attribute, and application is signed. Continuing. See: ​http://docs.oracle.com/javase/7/docs/technotes/guides/jweb/security/no_redeploy.html for details.
Starting application [org.openstreetmap.josm.gui.MainApplication] ...
2019-04-30 17:01:41.575 INFO: Log level is at INFO (INFO, 800)
netx: Launch Error: Could not launch JNLP file. ( (Provider for class javax.xml.validation.SchemaFactory cannot be created (javax.xml.validation.SchemaFactory: Provider org.apache.xerces.jaxp.validation.XMLSchemaFactory not found)))
net.sourceforge.jnlp.LaunchException: Fatal: Launch Error: Could not launch JNLP file. The application has not been initialized, for more information execute javaws/browser from the command line and send a bug report.

at java.desktop/net.sourceforge.jnlp.Launcher.launchApplication(Launcher.java:582)
at java.desktop/net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:945)

Caused by: java.lang.reflect.InvocationTargetException

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at java.desktop/net.sourceforge.jnlp.Launcher.launchApplication(Launcher.java:576)
... 1 more

Caused by: javax.xml.validation.SchemaFactoryConfigurationError: Provider for class javax.xml.validation.SchemaFactory cannot be created

at java.xml/javax.xml.validation.SchemaFactoryFinder.findServiceProvider(SchemaFactoryFinder.java:350)
at java.xml/javax.xml.validation.SchemaFactoryFinder._newFactory(SchemaFactoryFinder.java:217)
at java.xml/javax.xml.validation.SchemaFactoryFinder.newFactory(SchemaFactoryFinder.java:144)
at java.xml/javax.xml.validation.SchemaFactory.newInstance(SchemaFactory.java:245)
at org.openstreetmap.josm.tools.XmlUtils.newXmlSchemaFactory(XmlUtils.java:55)
at org.openstreetmap.josm.data.preferences.PreferencesReader.validateXML(PreferencesReader.java:97)
at org.openstreetmap.josm.data.preferences.PreferencesReader.validateXML(PreferencesReader.java:85)
at org.openstreetmap.josm.data.Preferences.load(Preferences.java:411)
at org.openstreetmap.josm.data.Preferences.init(Preferences.java:522)
at org.openstreetmap.josm.gui.MainApplication.mainJOSM(MainApplication.java:782)
at org.openstreetmap.josm.gui.MainApplication$3.processArguments(MainApplication.java:277)
at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:704)
... 6 more

Caused by: java.util.ServiceConfigurationError: javax.xml.validation.SchemaFactory: Provider org.apache.xerces.jaxp.validation.XMLSchemaFactory not found

at java.base/java.util.ServiceLoader.fail(ServiceLoader.java:588)
at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.nextProviderClass(ServiceLoader.java:1211)
at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNextService(ServiceLoader.java:1220)
at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator$1.run(ServiceLoader.java:1267)
at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator$1.run(ServiceLoader.java:1266)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNext(ServiceLoader.java:1269)
at java.base/java.util.ServiceLoader$2.hasNext(ServiceLoader.java:1299)
at java.base/java.util.ServiceLoader$3.hasNext(ServiceLoader.java:1384)
at java.xml/javax.xml.validation.SchemaFactoryFinder$2.run(SchemaFactoryFinder.java:339)
at java.xml/javax.xml.validation.SchemaFactoryFinder$2.run(SchemaFactoryFinder.java:335)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.xml/javax.xml.validation.SchemaFactoryFinder.findServiceProvider(SchemaFactoryFinder.java:335)
... 17 more

The file /usr/share/java/xercesImpl-2.12.0.jar contains the class "org/apache/xerces/jaxp/validation/XMLSchemaFactory.class".

Downloading josm.jar and running it directly works.
Until recently, javaws worked. And from what I remember, I didn't change anything that might cause it to not work anymore.
It stopped working ~ Apr 20 or perhaps a few days earlier.