# Erreur à l'ouverture de GP failed to launch the UI :

**URL:** <https://help.ganttproject.biz/t/erreur-a-louverture-de-gp-failed-to-launch-the-ui/12343>\
**Category:** GanttProject Desktop Support\
**Created:** [March 10, 2026, 1:39pm UTC](https://help.ganttproject.biz/t/erreur-a-louverture-de-gp-failed-to-launch-the-ui/12343 "2026-03-10T13:39:05Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![rosoli](https://help.ganttproject.biz/letter_avatar_proxy/v4/letter/r/958977/32.png) [@rosoli](https://help.ganttproject.biz/u/rosoli)\
**Post date:** [March 10, 2026, 1:39pm UTC](https://help.ganttproject.biz/t/erreur-a-louverture-de-gp-failed-to-launch-the-ui/12343/1 "2026-03-10T13:39:05Z")

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Bonjour,

j’ai installé la version GP 3.3.3316 sur un windows 11 pro.

Je suis admin de l’ensemble du répertoire GP.

Pas de Java oracle installé localement.

ou lancement de GP, j’ai l’erreur Failed to launch the UI : java.io.IOExecption:java.security.NoSuchAlgorithmeException : Error constructing implementation …

je joins le contenu du fichier gnttproject.log

[2026-03-10 13:36:14] [GRAV][App] Failure when launching application  
java.io.UncheckedIOException: java.io.IOException: java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: sun.security.ssl.SSLContextImpl$DefaultSSLContext)  
at java.net.http/jdk.internal.net.http.HttpClientImpl.(Unknown Source)  
at java.net.http/jdk.internal.net.http.HttpClientImpl.create(Unknown Source)  
at java.net.http/jdk.internal.net.http.HttpClientBuilderImpl.build(Unknown Source)  
at com.bardsoftware.eclipsito.update.UpdaterImpl.getUpdateMetadata(UpdaterImpl.java:47)  
at biz.ganttproject.platform.UpdateKt.checkAvailableUpdates(Update.kt:64)  
at net.sourceforge.ganttproject.GanttProjectBase.setUpdater(GanttProjectBase.java:512)  
at net.sourceforge.ganttproject.AppBuilder$launch$2.invoke(App.kt:204)  
at net.sourceforge.ganttproject.AppBuilder$launch$2.invoke(App.kt:203)  
at net.sourceforge.ganttproject.AppKt.startUiApp$lambda$0(App.kt:71)  
at java.desktop/java.awt.event.InvocationEvent.dispatch(Unknown Source)  
at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)  
at java.desktop/java.awt.EventQueue$4.run(Unknown Source)  
at java.desktop/java.awt.EventQueue$4.run(Unknown Source)  
at java.base/java.security.AccessController.doPrivileged(Unknown Source)  
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)  
at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)  
Caused by: java.io.IOException: java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: sun.security.ssl.SSLContextImpl$DefaultSSLContext)  
… 22 more  
Caused by: java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: sun.security.ssl.SSLContextImpl$DefaultSSLContext)  
at java.base/java.security.Provider$Service.newInstance(Unknown Source)  
at java.base/sun.security.jca.GetInstance.getInstance(Unknown Source)  
at java.base/sun.security.jca.GetInstance.getInstance(Unknown Source)  
at java.base/javax.net.ssl.SSLContext.getInstance(Unknown Source)  
at java.base/javax.net.ssl.SSLContext.getDefault(Unknown Source)  
… 22 more  
Caused by: java.security.KeyManagementException: problem accessing trust store  
at java.base/sun.security.ssl.SSLContextImpl$DefaultManagersHolder.(Unknown Source)  
at java.base/sun.security.ssl.SSLContextImpl$DefaultSSLContext.(Unknown Source)  
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)  
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)  
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)  
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Unknown Source)  
at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)  
at java.base/java.security.Provider$Service.newInstanceOf(Unknown Source)  
at java.base/java.security.Provider$Service.newInstanceUtil(Unknown Source)  
… 27 more

java.io.UncheckedIOException: java.io.IOException: java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: sun.security.ssl.SSLContextImpl$DefaultSSLContext)  
at java.net.http/jdk.internal.net.http.HttpClientImpl.(Unknown Source)  
at java.net.http/jdk.internal.net.http.HttpClientImpl.create(Unknown Source)  
at java.net.http/jdk.internal.net.http.HttpClientBuilderImpl.build(Unknown Source)  
at com.bardsoftware.eclipsito.update.UpdaterImpl.getUpdateMetadata(UpdaterImpl.java:47)  
at biz.ganttproject.platform.UpdateKt.checkAvailableUpdates(Update.kt:64)  
at net.sourceforge.ganttproject.GanttProjectBase.setUpdater(GanttProjectBase.java:512)  
at net.sourceforge.ganttproject.AppBuilder$launch$2.invoke(App.kt:204)  
at net.sourceforge.ganttproject.AppBuilder$launch$2.invoke(App.kt:203)  
at net.sourceforge.ganttproject.AppKt.startUiApp$lambda$0(App.kt:71)  
at java.desktop/java.awt.event.InvocationEvent.dispatch(Unknown Source)  
at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)  
at java.desktop/java.awt.EventQueue$4.run(Unknown Source)  
at java.desktop/java.awt.EventQueue$4.run(Unknown Source)  
at java.base/java.security.AccessController.doPrivileged(Unknown Source)  
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)  
at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)  
at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)  
Caused by: java.io.IOException: java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: sun.security.ssl.SSLContextImpl$DefaultSSLContext)  
… 22 more  
Caused by: java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: sun.security.ssl.SSLContextImpl$DefaultSSLContext)  
at java.base/java.security.Provider$Service.newInstance(Unknown Source)  
at java.base/sun.security.jca.GetInstance.getInstance(Unknown Source)  
at java.base/sun.security.jca.GetInstance.getInstance(Unknown Source)  
at java.base/javax.net.ssl.SSLContext.getInstance(Unknown Source)  
at java.base/javax.net.ssl.SSLContext.getDefault(Unknown Source)  
… 22 more  
Caused by: java.security.KeyManagementException: problem accessing trust store  
at java.base/sun.security.ssl.SSLContextImpl$DefaultManagersHolder.(Unknown Source)  
at java.base/sun.security.ssl.SSLContextImpl$DefaultSSLContext.(Unknown Source)  
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)  
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)  
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)  
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Unknown Source)  
at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)  
at java.base/java.security.Provider$Service.newInstanceOf(Unknown Source)  
at java.base/java.security.Provider$Service.newInstanceUtil(Unknown Source)  
… 27 more

Merci pour votre retour

Stephane Rosoli

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<div class="post-metadata">

**Author:** ![rosoli](https://help.ganttproject.biz/letter_avatar_proxy/v4/letter/r/958977/32.png) [@rosoli](https://help.ganttproject.biz/u/rosoli)\
**Post date:** [March 10, 2026, 1:50pm UTC](https://help.ganttproject.biz/t/erreur-a-louverture-de-gp-failed-to-launch-the-ui/12343/2 "2026-03-10T13:50:16Z")

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RE,

j’ai ajouté le SET JAVA\_HOME=”runtime”.

le .bat se lance mais meme erreur de launch th eUI.

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**Author:** ![DmitryBarashev](https://help.ganttproject.biz/user_avatar/help.ganttproject.biz/dmitrybarashev/32/406_2.png) [@DmitryBarashev](https://help.ganttproject.biz/u/DmitryBarashev)\
**Post date:** [March 10, 2026, 8:56pm UTC](https://help.ganttproject.biz/t/erreur-a-louverture-de-gp-failed-to-launch-the-ui/12343/3 "2026-03-10T20:56:16Z")

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Do you have any antivirus software running on your machine?

Also, please attach the complete log file.