Bugs in Rewrite Entry of type System ID to XML Catalog

[heidivanparys]

When I try to add a Rewrite Entry with "Key type to match" set to "System ID" to my XML Catalog, I get a NullPointerException.

Steps performed

(example from https://xmlcatalogs.org/catalogs-1.1#s.rewrite)

When clicking OK, the dialog does not close, and the error "Unhandled event loop exception" appears in the Error Log (see the whole log entry below).

Workaround

Add a Rewrite Entry with the "Key type to match" set to "URI".

Open the entry again, change "Key type to match" from "URI" to "System ID", and click OK.

The entry is displayed correct in when selecting it in the XML Catalog, and is also exported correct.

Note that there is another (related?) bug: when editing the entry again, the "Key type to match" dropdown will again show URI, although the entry was saved with "Key type to match" = "System ID".

eclipse.buildId=4.36.0.20250605-1300
java.version=21.0.7
java.vendor=Eclipse Adoptium
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.dsl.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.dsl.product

org.eclipse.ui
Error
Mon Jun 23 13:43:20 CEST 2025
Unhandled event loop exception

java.lang.NullPointerException: Cannot invoke "String.equals(Object)" because the return value of "org.eclipse.wst.xml.core.internal.catalog.provisional.IRewriteEntry.getStartString()" is null
	at org.eclipse.wst.xml.ui.internal.catalog.EditCatalogEntryDialog$RewriteEntryPage.validateData(EditCatalogEntryDialog.java:1317)
	at org.eclipse.wst.xml.ui.internal.catalog.EditCatalogEntryDialog$RewriteEntryPage.saveData(EditCatalogEntryDialog.java:1290)
	at org.eclipse.wst.xml.ui.internal.catalog.EditCatalogEntryDialog.buttonPressed(EditCatalogEntryDialog.java:1491)
	at org.eclipse.jface.dialogs.Dialog.lambda$0(Dialog.java:615)
	at org.eclipse.swt.events.SelectionListener$1.widgetSelected(SelectionListener.java:83)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:286)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4338)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1214)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4136)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3724)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:823)
	at org.eclipse.jface.window.Window.open(Window.java:799)
	at org.eclipse.wst.xml.ui.internal.catalog.XMLCatalogEntriesView.invokeDialog(XMLCatalogEntriesView.java:212)
	at org.eclipse.wst.xml.ui.internal.catalog.XMLCatalogEntriesView.invokeDialog(XMLCatalogEntriesView.java:217)
	at org.eclipse.wst.xml.ui.internal.catalog.XMLCatalogEntriesView.performNew(XMLCatalogEntriesView.java:225)
	at org.eclipse.wst.xml.ui.internal.catalog.XMLCatalogEntriesView$2.widgetSelected(XMLCatalogEntriesView.java:125)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:286)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4338)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1214)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4136)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3724)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:823)
	at org.eclipse.jface.window.Window.open(Window.java:799)
	at org.eclipse.ui.internal.OpenPreferencesAction.run(OpenPreferencesAction.java:64)
	at org.eclipse.jface.action.Action.runWithEvent(Action.java:474)
	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:581)
	at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:415)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4338)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1214)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4136)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3724)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1151)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1042)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:678)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:583)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:185)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:219)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:149)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:115)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:467)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:298)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:627)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1431)