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downgrade elk version for fix #389

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@cgi
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@cgi cgi commented Sep 17, 2025

Workaround for error #336

Tested locally successfully for personal use.

@The-Lum
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The-Lum commented Sep 17, 2025

Hi all,

  • Do we have any other workaround solution without downgrading ELK?
    Especially to track the developments or evolution of ELK

Regards,
Th.

@cgi
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cgi commented Sep 17, 2025

The correct solution to the problem is to add a block of code for the initialization service to the main PlantUML project, but I can't find the right place for this.

@arnaudroques
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arnaudroques commented Sep 17, 2025

You may add a new method in https://github.com/plantuml/plantuml-server/blob/master/src/main/java/net/sourceforge/plantuml/servlet/PlantUmlServlet.java

Something like:

	@Override
	public void init() throws ServletException {
		super.init();
		// block of code for the initialization service
	}

@arnaudroques
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arnaudroques commented Sep 17, 2025

BTW,

elk version are different in the main library
https://github.com/plantuml/plantuml/blob/master/gradle/libs.versions.toml

Is this an issue?

@cgi
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cgi commented Sep 17, 2025

There is 0.11.0 version of ELK - and related bug seems to be fixed - will try to compile with 0.11.0 version and return with feedback

@cgi
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cgi commented Sep 17, 2025

Try to update version to 0.11.0 and run ELK diagram - result : Error

java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at net.sourceforge.plantuml.elk.proxy.Reflect.call2(Reflect.java:224)
        at net.sourceforge.plantuml.elk.proxy.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:13)
        at net.sourceforge.plantuml.elk.CucaDiagramFileMakerElk.createFile(CucaDiagramFileMakerElk.java:323)
        at net.atmp.CucaDiagram.exportDiagramInternal(CucaDiagram.java:489)
        at net.sourceforge.plantuml.classdiagram.ClassDiagram.exportDiagramInternal(ClassDiagram.java:85)
        at net.sourceforge.plantuml.UmlDiagram.exportDiagramNow(UmlDiagram.java:119)
        at net.sourceforge.plantuml.AbstractPSystem.exportDiagram(AbstractPSystem.java:217)
        at net.sourceforge.plantuml.servlet.DiagramResponse.sendMap(DiagramResponse.java:321)
        at net.sourceforge.plantuml.servlet.MapServlet.doGet(MapServlet.java:57)
        at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:500)
        at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:587)
        at org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1410)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)
        at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)
        at org.eclipse.jetty.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:170)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:598)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:223)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1580)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1381)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1553)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1303)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:149)
        at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:51)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.Server.handle(Server.java:563)
        at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)
        at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:287)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
        at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)
        at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.util.ServiceConfigurationError: org.eclipse.elk.core.data.ILayoutMetaDataProvider: Provider org.eclipse.elk.alg.layered.options.LayeredMetaDataProvider could not be instantiated
        at java.base/java.util.ServiceLoader.fail(Unknown Source)
        at java.base/java.util.ServiceLoader$ProviderImpl.newInstance(Unknown Source)
        at java.base/java.util.ServiceLoader$ProviderImpl.get(Unknown Source)
        at java.base/java.util.ServiceLoader$3.next(Unknown Source)
        at org.eclipse.elk.core.data.LayoutMetaDataService.getInstance(LayoutMetaDataService.java:81)
        at org.eclipse.elk.core.data.LayoutMetaDataService.getInstance(LayoutMetaDataService.java:58)
        at org.eclipse.elk.core.data.LayoutAlgorithmResolver.resolveAndSetAlgorithm(LayoutAlgorithmResolver.java:86)
        at org.eclipse.elk.core.data.LayoutAlgorithmResolver.resolveAlgorithm(LayoutAlgorithmResolver.java:46)
        at org.eclipse.elk.core.data.LayoutAlgorithmResolver.visit(LayoutAlgorithmResolver.java:28)
        at org.eclipse.elk.core.util.ElkUtil.applyVisitors(ElkUtil.java:1088)
        at org.eclipse.elk.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:101)
        at org.eclipse.elk.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:81)
        ... 55 more
Caused by: java.lang.NoClassDefFoundError: org/eclipse/xtext/xbase/lib/CollectionLiterals
        at org.eclipse.elk.alg.layered.options.LayeredMetaDataProvider.<clinit>(LayeredMetaDataProvider.java:1432)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Unknown Source)
        at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)
        ... 66 more
Caused by: java.lang.ClassNotFoundException: org.eclipse.xtext.xbase.lib.CollectionLiterals
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
        at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
        at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:511)
        at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
        ... 72 more
java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at net.sourceforge.plantuml.elk.proxy.Reflect.call2(Reflect.java:224)
        at net.sourceforge.plantuml.elk.proxy.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:13)
        at net.sourceforge.plantuml.elk.CucaDiagramFileMakerElk.createFile(CucaDiagramFileMakerElk.java:323)
        at net.atmp.CucaDiagram.exportDiagramInternal(CucaDiagram.java:489)
        at net.sourceforge.plantuml.classdiagram.ClassDiagram.exportDiagramInternal(ClassDiagram.java:85)
        at net.sourceforge.plantuml.UmlDiagram.exportDiagramNow(UmlDiagram.java:119)
        at net.sourceforge.plantuml.AbstractPSystem.exportDiagram(AbstractPSystem.java:217)
        at net.sourceforge.plantuml.servlet.DiagramResponse.sendDiagram(DiagramResponse.java:204)
        at net.sourceforge.plantuml.servlet.UmlDiagramService.doDiagramResponse(UmlDiagramService.java:100)
        at net.sourceforge.plantuml.servlet.UmlDiagramService.doGet(UmlDiagramService.java:62)
        at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:500)
        at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:587)
        at org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1410)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)
        at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)
        at org.eclipse.jetty.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:170)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:598)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:223)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1580)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1381)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1553)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1303)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:149)
        at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:51)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.Server.handle(Server.java:563)
        at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)
        at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:287)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
        at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)
        at java.base/java.lang.Thread.run(Unknown Source)
Caused by: org.eclipse.elk.core.UnsupportedConfigurationException: Unable to load default layout algorithm org.eclipse.elk.layered for unconfigured node Root Node
        at org.eclipse.elk.core.data.LayoutAlgorithmResolver.resolveAlgorithm(LayoutAlgorithmResolver.java:61)
        at org.eclipse.elk.core.data.LayoutAlgorithmResolver.visit(LayoutAlgorithmResolver.java:28)
        at org.eclipse.elk.core.util.ElkUtil.applyVisitors(ElkUtil.java:1088)
        at org.eclipse.elk.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:101)
        at org.eclipse.elk.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:81)
        ... 56 more
java.lang.IllegalArgumentException: java.lang.reflect.InvocationTargetException
        at net.sourceforge.plantuml.elk.proxy.Reflect.call2(Reflect.java:227)
        at net.sourceforge.plantuml.elk.proxy.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:13)
        at net.sourceforge.plantuml.elk.CucaDiagramFileMakerElk.createFile(CucaDiagramFileMakerElk.java:323)
        at net.atmp.CucaDiagram.exportDiagramInternal(CucaDiagram.java:489)
        at net.sourceforge.plantuml.classdiagram.ClassDiagram.exportDiagramInternal(ClassDiagram.java:85)
        at net.sourceforge.plantuml.UmlDiagram.exportDiagramNow(UmlDiagram.java:119)
        at net.sourceforge.plantuml.AbstractPSystem.exportDiagram(AbstractPSystem.java:217)
        at net.sourceforge.plantuml.servlet.DiagramResponse.sendMap(DiagramResponse.java:321)
        at net.sourceforge.plantuml.servlet.MapServlet.doGet(MapServlet.java:57)
        at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:500)
        at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:587)
        at org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1410)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)
        at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)
        at org.eclipse.jetty.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:170)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:598)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:223)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1580)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1381)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1553)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1303)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:149)
        at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:51)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.Server.handle(Server.java:563)
        at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)
        at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:287)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
        at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)
        at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at net.sourceforge.plantuml.elk.proxy.Reflect.call2(Reflect.java:224)
        ... 50 more
Caused by: java.util.ServiceConfigurationError: org.eclipse.elk.core.data.ILayoutMetaDataProvider: Provider org.eclipse.elk.alg.layered.options.LayeredMetaDataProvider could not be instantiated
        at java.base/java.util.ServiceLoader.fail(Unknown Source)
        at java.base/java.util.ServiceLoader$ProviderImpl.newInstance(Unknown Source)
        at java.base/java.util.ServiceLoader$ProviderImpl.get(Unknown Source)
        at java.base/java.util.ServiceLoader$3.next(Unknown Source)
        at org.eclipse.elk.core.data.LayoutMetaDataService.getInstance(LayoutMetaDataService.java:81)
        at org.eclipse.elk.core.data.LayoutMetaDataService.getInstance(LayoutMetaDataService.java:58)
        at org.eclipse.elk.core.data.LayoutAlgorithmResolver.resolveAndSetAlgorithm(LayoutAlgorithmResolver.java:86)
        at org.eclipse.elk.core.data.LayoutAlgorithmResolver.resolveAlgorithm(LayoutAlgorithmResolver.java:46)
        at org.eclipse.elk.core.data.LayoutAlgorithmResolver.visit(LayoutAlgorithmResolver.java:28)
        at org.eclipse.elk.core.util.ElkUtil.applyVisitors(ElkUtil.java:1088)
        at org.eclipse.elk.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:101)
        at org.eclipse.elk.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:81)
        ... 55 more
Caused by: java.lang.NoClassDefFoundError: org/eclipse/xtext/xbase/lib/CollectionLiterals
        at org.eclipse.elk.alg.layered.options.LayeredMetaDataProvider.<clinit>(LayeredMetaDataProvider.java:1432)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Unknown Source)
        at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)
        ... 66 more
Caused by: java.lang.ClassNotFoundException: org.eclipse.xtext.xbase.lib.CollectionLiterals
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
        at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
        at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:511)
        at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
        ... 72 more
java.lang.IllegalArgumentException: java.lang.reflect.InvocationTargetException
        at net.sourceforge.plantuml.elk.proxy.Reflect.call2(Reflect.java:227)
        at net.sourceforge.plantuml.elk.proxy.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:13)
        at net.sourceforge.plantuml.elk.CucaDiagramFileMakerElk.createFile(CucaDiagramFileMakerElk.java:323)
        at net.atmp.CucaDiagram.exportDiagramInternal(CucaDiagram.java:489)
        at net.sourceforge.plantuml.classdiagram.ClassDiagram.exportDiagramInternal(ClassDiagram.java:85)
        at net.sourceforge.plantuml.UmlDiagram.exportDiagramNow(UmlDiagram.java:119)
        at net.sourceforge.plantuml.AbstractPSystem.exportDiagram(AbstractPSystem.java:217)
        at net.sourceforge.plantuml.servlet.DiagramResponse.sendDiagram(DiagramResponse.java:204)
        at net.sourceforge.plantuml.servlet.UmlDiagramService.doDiagramResponse(UmlDiagramService.java:100)
        at net.sourceforge.plantuml.servlet.UmlDiagramService.doGet(UmlDiagramService.java:62)
        at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:500)
        at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:587)
        at org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1410)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)
        at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)
        at org.eclipse.jetty.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:170)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:598)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:223)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1580)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1381)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1553)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1303)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:149)
        at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:51)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.Server.handle(Server.java:563)
        at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)
        at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:287)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
        at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)
        at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at net.sourceforge.plantuml.elk.proxy.Reflect.call2(Reflect.java:224)
        ... 51 more
Caused by: org.eclipse.elk.core.UnsupportedConfigurationException: Unable to load default layout algorithm org.eclipse.elk.layered for unconfigured node Root Node
        at org.eclipse.elk.core.data.LayoutAlgorithmResolver.resolveAlgorithm(LayoutAlgorithmResolver.java:61)
        at org.eclipse.elk.core.data.LayoutAlgorithmResolver.visit(LayoutAlgorithmResolver.java:28)
        at org.eclipse.elk.core.util.ElkUtil.applyVisitors(ElkUtil.java:1088)
        at org.eclipse.elk.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:101)
        at org.eclipse.elk.core.RecursiveGraphLayoutEngine.layout(RecursiveGraphLayoutEngine.java:81)
        ... 56 more

@arnaudroques
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arnaudroques commented Sep 17, 2025

Maybe we should add ?

    <dependency>
      <groupId>org.eclipse.xtext</groupId>
      <artifactId>org.eclipse.xtext.xbase.lib</artifactId>
      <version>2.25.0</version> <!-- Java 8/11 -->
    </dependency>

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