[580424] Avoid NPE in Sirius Session Details Report computation.HEADv7.0.2master

Bug: 580424
Change-Id: I823204a6b30edd5fd91acce399b1bfd1e9f9bd8a
Signed-off-by: Maxime Porhel <maxime.porhel@obeo.fr>

4 files changed, 146 insertions, 103 deletions

diff --git a/plugins/org.eclipse.sirius.tests.swtbot/data/unit/propertypage/representations.aird b/plugins/org.eclipse.sirius.tests.swtbot/data/unit/propertypage/representations.aird
index 1cfc9444b4..57128d7259 100644
--- a/plugins/org.eclipse.sirius.tests.swtbot/data/unit/propertypage/representations.aird
+++ b/plugins/org.eclipse.sirius.tests.swtbot/data/unit/propertypage/representations.aird
@@ -1,19 +1,26 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<xmi:XMI xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:description="http://www.eclipse.org/sirius/description/1.1.0" xmlns:description_1="http://www.eclipse.org/sirius/diagram/description/1.1.0" xmlns:description_2="http://www.eclipse.org/sirius/table/description/1.1.0" xmlns:diagram="http://www.eclipse.org/sirius/diagram/1.1.0" xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" xmlns:notation="http://www.eclipse.org/gmf/runtime/1.0.3/notation" xmlns:style="http://www.eclipse.org/sirius/diagram/description/style/1.1.0" xmlns:table="http://www.eclipse.org/sirius/table/1.1.0" xmlns:viewpoint="http://www.eclipse.org/sirius/1.1.0" xsi:schemaLocation="http://www.eclipse.org/sirius/description/1.1.0 http://www.eclipse.org/sirius/1.1.0#//description http://www.eclipse.org/sirius/diagram/description/1.1.0 http://www.eclipse.org/sirius/diagram/1.1.0#//description http://www.eclipse.org/sirius/table/description/1.1.0 http://www.eclipse.org/sirius/table/1.1.0#//description http://www.eclipse.org/sirius/diagram/description/style/1.1.0 http://www.eclipse.org/sirius/diagram/1.1.0#//description/style">
-  <viewpoint:DAnalysis uid="_4wLwoGu3EeuuXbLvG4gakA" selectedViews="_8nfZYGu3EeuuXbLvG4gakA" version="14.3.1.202003261200">
+<xmi:XMI xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:description="http://www.eclipse.org/sirius/description/1.1.0" xmlns:description_1="http://www.eclipse.org/sirius/diagram/description/1.1.0" xmlns:description_2="http://www.eclipse.org/sirius/table/description/1.1.0" xmlns:diagram="http://www.eclipse.org/sirius/diagram/1.1.0" xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" xmlns:filter="http://www.eclipse.org/sirius/diagram/description/filter/1.1.0" xmlns:notation="http://www.eclipse.org/gmf/runtime/1.0.3/notation" xmlns:style="http://www.eclipse.org/sirius/diagram/description/style/1.1.0" xmlns:table="http://www.eclipse.org/sirius/table/1.1.0" xmlns:viewpoint="http://www.eclipse.org/sirius/1.1.0" xsi:schemaLocation="http://www.eclipse.org/sirius/description/1.1.0 http://www.eclipse.org/sirius/1.1.0#//description http://www.eclipse.org/sirius/diagram/description/1.1.0 http://www.eclipse.org/sirius/diagram/1.1.0#//description http://www.eclipse.org/sirius/table/description/1.1.0 http://www.eclipse.org/sirius/table/1.1.0#//description http://www.eclipse.org/sirius/diagram/description/filter/1.1.0 http://www.eclipse.org/sirius/diagram/1.1.0#//description/filter http://www.eclipse.org/sirius/diagram/description/style/1.1.0 http://www.eclipse.org/sirius/diagram/1.1.0#//description/style">
+  <viewpoint:DAnalysis uid="_4wLwoGu3EeuuXbLvG4gakA" selectedViews="_8nfZYGu3EeuuXbLvG4gakA" version="15.0.0.202201261500">
     <semanticResources>My.ecore</semanticResources>
     <ownedViews xmi:type="viewpoint:DView" uid="_8nfZYGu3EeuuXbLvG4gakA">
       <viewpoint xmi:type="description:Viewpoint" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']"/>
-      <ownedRepresentationDescriptors xmi:type="viewpoint:DRepresentationDescriptor" uid="_8t7_oGu3EeuuXbLvG4gakA" name="root package entities" repPath="#_8tukQGu3EeuuXbLvG4gakA" changeId="a77acbdb-5e8f-4155-a461-2b5f9257c81c">
+      <ownedRepresentationDescriptors xmi:type="viewpoint:DRepresentationDescriptor" uid="_8t7_oGu3EeuuXbLvG4gakA" name="root package entities" repPath="#_8tukQGu3EeuuXbLvG4gakA" changeId="8ef0879d-3539-4b60-a155-007d52a1514e">
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         <target xmi:type="ecore:EPackage" href="My.ecore#/"/>
       </ownedRepresentationDescriptors>
-      <ownedRepresentationDescriptors xmi:type="viewpoint:DRepresentationDescriptor" uid="_X14A0Gu5EeucgZBzLx9xaw" name="root package entities BROKEN" repPath="#_X1N5gGu5EeucgZBzLx9xaw" changeId="9590adfb-c352-4164-84f5-ff80b7dd2f66">
+      <ownedRepresentationDescriptors xmi:type="viewpoint:DRepresentationDescriptor" uid="_KjzRUGu6EeucgZBzLx9xaw" name="Classes in root package" repPath="#_Kh3-sGu6EeucgZBzLx9xaw" changeId="296e4f9d-2135-4113-b1f6-0e24ec65d399">
+        <description xmi:type="description_2:EditionTableDescription" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Classes']"/>
+        <target xmi:type="ecore:EPackage" href="My.ecore#/"/>
+      </ownedRepresentationDescriptors>
+      <ownedRepresentationDescriptors xmi:type="viewpoint:DRepresentationDescriptor" uid="_XlP0gAj6Ee2OwOZgulCHPg" name="no target package entities BROKEN NoTarget" repPath="#_XlNYQAj6Ee2OwOZgulCHPg" changeId="4effe867-8579-4177-b1b2-a462a907f4b3">
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+      </ownedRepresentationDescriptors>
+      <ownedRepresentationDescriptors xmi:type="viewpoint:DRepresentationDescriptor" uid="_TMvtwAj7Ee2OwOZgulCHPg" name="root package entities BROKEN NoRepPath">
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         <target xmi:type="ecore:EPackage" href="My.ecore#/"/>
       </ownedRepresentationDescriptors>
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+      <ownedRepresentationDescriptors xmi:type="viewpoint:DRepresentationDescriptor" uid="_Uf3ihgj7Ee2OwOZgulCHPg" name="root package entities BROKEN NoRep" repPath="#_Uf2UYAj7Ee2OwOZgulCHPg">
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@@ -149,153 +156,167 @@
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     <target xmi:type="ecore:EPackage" href="My.ecore#/"/>
   </diagram:DSemanticDiagram>
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+  <diagram:DSemanticDiagram uid="_TMt4kAj7Ee2OwOZgulCHPg" synchronized="false">
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-          <targetAnchor xmi:type="notation:IdentityAnchor" xmi:id="_X8uPsWu5EeucgZBzLx9xaw" id="(0.5098039215686274,1.0)"/>
+          <styles xmi:type="notation:ConnectorStyle" xmi:id="_TMvt7Qj7Ee2OwOZgulCHPg" routing="Tree"/>
+          <styles xmi:type="notation:FontStyle" xmi:id="_TMvt7gj7Ee2OwOZgulCHPg" fontName="Segoe UI" fontHeight="8"/>
+          <bendpoints xmi:type="notation:RelativeBendpoints" xmi:id="_TMvt7wj7Ee2OwOZgulCHPg" points="[-1, 0, -1, 60]$[-1, -60, -1, 0]"/>
+          <sourceAnchor xmi:type="notation:IdentityAnchor" xmi:id="_TMvt8Aj7Ee2OwOZgulCHPg" id="(0.5263157894736842,0.0)"/>
+          <targetAnchor xmi:type="notation:IdentityAnchor" xmi:id="_TMvt8Qj7Ee2OwOZgulCHPg" id="(0.5098039215686274,1.0)"/>
         </edges>
-        <edges xmi:type="notation:Edge" xmi:id="_X8u2wGu5EeucgZBzLx9xaw" type="4001" element="_X6uEkGu5EeucgZBzLx9xaw" source="_X7xNcGu5EeucgZBzLx9xaw" target="_X7x0hGu5EeucgZBzLx9xaw">
-          <children xmi:type="notation:Node" xmi:id="_X8vd0Gu5EeucgZBzLx9xaw" type="6001">
-            <layoutConstraint xmi:type="notation:Bounds" xmi:id="_X8vd0Wu5EeucgZBzLx9xaw" y="-10"/>
+        <edges xmi:type="notation:Edge" xmi:id="_TMvt8gj7Ee2OwOZgulCHPg" type="4001" element="_TMvGtgj7Ee2OwOZgulCHPg" source="_TMvtyQj7Ee2OwOZgulCHPg" target="_TMvt0Aj7Ee2OwOZgulCHPg">
+          <children xmi:type="notation:Node" xmi:id="_TMvt8wj7Ee2OwOZgulCHPg" type="6001">
+            <layoutConstraint xmi:type="notation:Bounds" xmi:id="_TMvt9Aj7Ee2OwOZgulCHPg" y="-10"/>
           </children>
-          <children xmi:type="notation:Node" xmi:id="_X8vd0mu5EeucgZBzLx9xaw" type="6002">
-            <layoutConstraint xmi:type="notation:Bounds" xmi:id="_X8vd02u5EeucgZBzLx9xaw" y="10"/>
+          <children xmi:type="notation:Node" xmi:id="_TMvt9Qj7Ee2OwOZgulCHPg" type="6002">
+            <layoutConstraint xmi:type="notation:Bounds" xmi:id="_TMvt9gj7Ee2OwOZgulCHPg" y="10"/>
           </children>
-          <children xmi:type="notation:Node" xmi:id="_X8wE4Gu5EeucgZBzLx9xaw" type="6003">
-            <layoutConstraint xmi:type="notation:Bounds" xmi:id="_X8wE4Wu5EeucgZBzLx9xaw" y="10"/>
+          <children xmi:type="notation:Node" xmi:id="_TMvt9wj7Ee2OwOZgulCHPg" type="6003">
+            <layoutConstraint xmi:type="notation:Bounds" xmi:id="_TMvt-Aj7Ee2OwOZgulCHPg" y="10"/>
           </children>
-          <styles xmi:type="notation:ConnectorStyle" xmi:id="_X8u2wWu5EeucgZBzLx9xaw" routing="Tree"/>
-          <styles xmi:type="notation:FontStyle" xmi:id="_X8u2wmu5EeucgZBzLx9xaw" fontName="Segoe UI" fontHeight="8"/>
-          <bendpoints xmi:type="notation:RelativeBendpoints" xmi:id="_X8u2w2u5EeucgZBzLx9xaw" points="[-1, 0, -1, 60]$[-1, -60, -1, 0]"/>
-          <sourceAnchor xmi:type="notation:IdentityAnchor" xmi:id="_X83ZoGu5EeucgZBzLx9xaw" id="(0.5263157894736842,0.0)"/>
-          <targetAnchor xmi:type="notation:IdentityAnchor" xmi:id="_X84AsGu5EeucgZBzLx9xaw" id="(0.5098039215686274,1.0)"/>
+          <styles xmi:type="notation:ConnectorStyle" xmi:id="_TMvt-Qj7Ee2OwOZgulCHPg" routing="Tree"/>
+          <styles xmi:type="notation:FontStyle" xmi:id="_TMvt-gj7Ee2OwOZgulCHPg" fontName="Segoe UI" fontHeight="8"/>
+          <bendpoints xmi:type="notation:RelativeBendpoints" xmi:id="_TMvt-wj7Ee2OwOZgulCHPg" points="[-1, 0, -1, 60]$[-1, -60, -1, 0]"/>
+          <sourceAnchor xmi:type="notation:IdentityAnchor" xmi:id="_TMvt_Aj7Ee2OwOZgulCHPg" id="(0.5263157894736842,0.0)"/>
+          <targetAnchor xmi:type="notation:IdentityAnchor" xmi:id="_TMvt_Qj7Ee2OwOZgulCHPg" id="(0.5098039215686274,1.0)"/>
         </edges>
       </data>
     </ownedAnnotationEntries>
-    <ownedAnnotationEntries xmi:type="description:AnnotationEntry" uid="_X65qwGu5EeucgZBzLx9xaw" source="DANNOTATION_CUSTOMIZATION_KEY">
-      <data xmi:type="diagram:ComputedStyleDescriptionRegistry" uid="_X65qwWu5EeucgZBzLx9xaw"/>
+    <ownedAnnotationEntries xmi:type="description:AnnotationEntry" uid="_TMufoAj7Ee2OwOZgulCHPg" source="DANNOTATION_CUSTOMIZATION_KEY">
+      <data xmi:type="diagram:ComputedStyleDescriptionRegistry" uid="_TMufoQj7Ee2OwOZgulCHPg"/>
     </ownedAnnotationEntries>
-    <ownedDiagramElements xmi:type="diagram:DNodeList" uid="_X5EewGu5EeucgZBzLx9xaw" tooltipText="root." outgoingEdges="_X6e0AGu5EeucgZBzLx9xaw">
+    <ownedDiagramElements xmi:type="diagram:DNodeList" uid="_TMufogj7Ee2OwOZgulCHPg" tooltipText="root." outgoingEdges="_TMvGswj7Ee2OwOZgulCHPg">
       <target xmi:type="ecore:EClass" href="My.ecore#//%"/>
       <semanticElements xmi:type="ecore:EClass" href="My.ecore#//%"/>
-      <ownedStyle xmi:type="diagram:FlatContainerStyle" uid="_X5brIGu5EeucgZBzLx9xaw" borderSize="1" borderSizeComputationExpression="1" backgroundStyle="GradientTopToBottom">
+      <ownedStyle xmi:type="diagram:FlatContainerStyle" uid="_TMufowj7Ee2OwOZgulCHPg" borderSize="1" borderSizeComputationExpression="1" backgroundStyle="GradientTopToBottom">
         <description xmi:type="style:FlatContainerStyleDescription" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@containerMappings[name='EC%20EClass']/@style"/>
       </ownedStyle>
       <actualMapping xmi:type="description_1:ContainerMapping" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@containerMappings[name='EC%20EClass']"/>
     </ownedDiagramElements>
-    <ownedDiagramElements xmi:type="diagram:DNodeList" uid="_X5ofcWu5EeucgZBzLx9xaw" tooltipText="root." outgoingEdges="_X6uEkGu5EeucgZBzLx9xaw">
+    <ownedDiagramElements xmi:type="diagram:DNodeList" uid="_TMufpAj7Ee2OwOZgulCHPg" tooltipText="root." outgoingEdges="_TMvGtgj7Ee2OwOZgulCHPg">
       <target xmi:type="ecore:EClass" href="My.ecore#//%.1"/>
       <semanticElements xmi:type="ecore:EClass" href="My.ecore#//%.1"/>
-      <ownedStyle xmi:type="diagram:FlatContainerStyle" uid="_X5pGgGu5EeucgZBzLx9xaw" borderSize="1" borderSizeComputationExpression="1" backgroundStyle="GradientTopToBottom">
+      <ownedStyle xmi:type="diagram:FlatContainerStyle" uid="_TMufpQj7Ee2OwOZgulCHPg" borderSize="1" borderSizeComputationExpression="1" backgroundStyle="GradientTopToBottom">
         <description xmi:type="style:FlatContainerStyleDescription" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@containerMappings[name='EC%20EClass']/@style"/>
       </ownedStyle>
       <actualMapping xmi:type="description_1:ContainerMapping" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@containerMappings[name='EC%20EClass']"/>
     </ownedDiagramElements>
-    <ownedDiagramElements xmi:type="diagram:DNodeList" uid="_X5ptkWu5EeucgZBzLx9xaw" name="class4" tooltipText="root.class4" incomingEdges="_X6uEkGu5EeucgZBzLx9xaw">
+    <ownedDiagramElements xmi:type="diagram:DNodeList" uid="_TMufpgj7Ee2OwOZgulCHPg" name="class4" tooltipText="root.class4" incomingEdges="_TMvGtgj7Ee2OwOZgulCHPg">
       <target xmi:type="ecore:EClass" href="My.ecore#//class4"/>
       <semanticElements xmi:type="ecore:EClass" href="My.ecore#//class4"/>
-      <ownedStyle xmi:type="diagram:FlatContainerStyle" uid="_X5q7sGu5EeucgZBzLx9xaw" borderSize="1" borderSizeComputationExpression="1" backgroundStyle="GradientTopToBottom">
+      <ownedStyle xmi:type="diagram:FlatContainerStyle" uid="_TMvGsAj7Ee2OwOZgulCHPg" borderSize="1" borderSizeComputationExpression="1" backgroundStyle="GradientTopToBottom">
         <description xmi:type="style:FlatContainerStyleDescription" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@containerMappings[name='EC%20EClass']/@style"/>
       </ownedStyle>
       <actualMapping xmi:type="description_1:ContainerMapping" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@containerMappings[name='EC%20EClass']"/>
     </ownedDiagramElements>
-    <ownedDiagramElements xmi:type="diagram:DNodeList" uid="_X5riwGu5EeucgZBzLx9xaw" name="class5" tooltipText="root.class5" incomingEdges="_X6e0AGu5EeucgZBzLx9xaw">
+    <ownedDiagramElements xmi:type="diagram:DNodeList" uid="_TMvGsQj7Ee2OwOZgulCHPg" name="class5" tooltipText="root.class5" incomingEdges="_TMvGswj7Ee2OwOZgulCHPg">
       <target xmi:type="ecore:EClass" href="My.ecore#//class5"/>
       <semanticElements xmi:type="ecore:EClass" href="My.ecore#//class5"/>
-      <ownedStyle xmi:type="diagram:FlatContainerStyle" uid="_X5sJ0Gu5EeucgZBzLx9xaw" borderSize="1" borderSizeComputationExpression="1" backgroundStyle="GradientTopToBottom">
+      <ownedStyle xmi:type="diagram:FlatContainerStyle" uid="_TMvGsgj7Ee2OwOZgulCHPg" borderSize="1" borderSizeComputationExpression="1" backgroundStyle="GradientTopToBottom">
         <description xmi:type="style:FlatContainerStyleDescription" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@containerMappings[name='EC%20EClass']/@style"/>
       </ownedStyle>
       <actualMapping xmi:type="description_1:ContainerMapping" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@containerMappings[name='EC%20EClass']"/>
     </ownedDiagramElements>
-    <ownedDiagramElements xmi:type="diagram:DEdge" uid="_X6e0AGu5EeucgZBzLx9xaw" sourceNode="_X5EewGu5EeucgZBzLx9xaw" targetNode="_X5riwGu5EeucgZBzLx9xaw">
+    <ownedDiagramElements xmi:type="diagram:DEdge" uid="_TMvGswj7Ee2OwOZgulCHPg" sourceNode="_TMufogj7Ee2OwOZgulCHPg" targetNode="_TMvGsQj7Ee2OwOZgulCHPg">
       <target xmi:type="ecore:EClass" href="My.ecore#//%"/>
-      <ownedStyle xmi:type="diagram:EdgeStyle" uid="_X6sPYGu5EeucgZBzLx9xaw" targetArrow="InputClosedArrow" routingStyle="tree">
+      <ownedStyle xmi:type="diagram:EdgeStyle" uid="_TMvGtAj7Ee2OwOZgulCHPg" targetArrow="InputClosedArrow" routingStyle="tree">
         <description xmi:type="style:EdgeStyleDescription" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@edgeMappings[name='EC%20ESupertypes']/@style"/>
-        <centerLabelStyle xmi:type="diagram:CenterLabelStyle" uid="_X6sPYWu5EeucgZBzLx9xaw" showIcon="false"/>
+        <centerLabelStyle xmi:type="diagram:CenterLabelStyle" uid="_TMvGtQj7Ee2OwOZgulCHPg" showIcon="false"/>
       </ownedStyle>
       <actualMapping xmi:type="description_1:EdgeMapping" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@edgeMappings[name='EC%20ESupertypes']"/>
     </ownedDiagramElements>
-    <ownedDiagramElements xmi:type="diagram:DEdge" uid="_X6uEkGu5EeucgZBzLx9xaw" sourceNode="_X5ofcWu5EeucgZBzLx9xaw" targetNode="_X5ptkWu5EeucgZBzLx9xaw">
+    <ownedDiagramElements xmi:type="diagram:DEdge" uid="_TMvGtgj7Ee2OwOZgulCHPg" sourceNode="_TMufpAj7Ee2OwOZgulCHPg" targetNode="_TMufpgj7Ee2OwOZgulCHPg">
       <target xmi:type="ecore:EClass" href="My.ecore#//%.1"/>
-      <ownedStyle xmi:type="diagram:EdgeStyle" uid="_X6uroGu5EeucgZBzLx9xaw" targetArrow="InputClosedArrow" routingStyle="tree">
+      <ownedStyle xmi:type="diagram:EdgeStyle" uid="_TMvGtwj7Ee2OwOZgulCHPg" targetArrow="InputClosedArrow" routingStyle="tree">
         <description xmi:type="style:EdgeStyleDescription" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@edgeMappings[name='EC%20ESupertypes']/@style"/>
-        <centerLabelStyle xmi:type="diagram:CenterLabelStyle" uid="_X6uroWu5EeucgZBzLx9xaw" showIcon="false"/>
+        <centerLabelStyle xmi:type="diagram:CenterLabelStyle" uid="_TMvGuAj7Ee2OwOZgulCHPg" showIcon="false"/>
       </ownedStyle>
       <actualMapping xmi:type="description_1:EdgeMapping" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@edgeMappings[name='EC%20ESupertypes']"/>
     </ownedDiagramElements>
-    <ownedDiagramElements xmi:type="diagram:DNodeList" uid="_5yP_sGu5EeucgZBzLx9xaw" name="NewEClass5" tooltipText="root.NewEClass5">
+    <ownedDiagramElements xmi:type="diagram:DNodeList" uid="_TMvGuQj7Ee2OwOZgulCHPg" name="NewEClass5" tooltipText="root.NewEClass5">
       <target xmi:type="ecore:EClass" href="My.ecore#//NewEClass5"/>
       <semanticElements xmi:type="ecore:EClass" href="My.ecore#//NewEClass5"/>
       <arrangeConstraints>KEEP_LOCATION</arrangeConstraints>
       <arrangeConstraints>KEEP_SIZE</arrangeConstraints>
       <arrangeConstraints>KEEP_RATIO</arrangeConstraints>
-      <ownedStyle xmi:type="diagram:FlatContainerStyle" uid="_5yYikGu5EeucgZBzLx9xaw" borderSize="1" borderSizeComputationExpression="1" backgroundStyle="GradientTopToBottom">
+      <ownedStyle xmi:type="diagram:FlatContainerStyle" uid="_TMvGugj7Ee2OwOZgulCHPg" borderSize="1" borderSizeComputationExpression="1" backgroundStyle="GradientTopToBottom">
         <description xmi:type="style:FlatContainerStyleDescription" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@containerMappings[name='EC%20EClass']/@style"/>
       </ownedStyle>
       <actualMapping xmi:type="description_1:ContainerMapping" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@containerMappings[name='EC%20EClass']"/>
     </ownedDiagramElements>
     <description xmi:type="description_1:DiagramDescription" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']"/>
-    <filterVariableHistory xmi:type="diagram:FilterVariableHistory" uid="_X1b78Gu5EeucgZBzLx9xaw"/>
+    <filterVariableHistory xmi:type="diagram:FilterVariableHistory" uid="_TMvGuwj7Ee2OwOZgulCHPg"/>
     <activatedLayers xmi:type="description_1:Layer" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer"/>
     <activatedLayers xmi:type="description_1:AdditionalLayer" href="platform:/plugin/org.eclipse.sirius.sample.ecore.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@additionalLayers[name='Package']"/>
     <target xmi:type="ecore:EPackage" href="My.ecore#/"/>
diff --git a/plugins/org.eclipse.sirius.tests.swtbot/src/org/eclipse/sirius/tests/swtbot/propertypage/SiriusSessionDetailsPropertyPageTest.java b/plugins/org.eclipse.sirius.tests.swtbot/src/org/eclipse/sirius/tests/swtbot/propertypage/SiriusSessionDetailsPropertyPageTest.java
index e4e6dabd81..8fb4f41e47 100644
--- a/plugins/org.eclipse.sirius.tests.swtbot/src/org/eclipse/sirius/tests/swtbot/propertypage/SiriusSessionDetailsPropertyPageTest.java
+++ b/plugins/org.eclipse.sirius.tests.swtbot/src/org/eclipse/sirius/tests/swtbot/propertypage/SiriusSessionDetailsPropertyPageTest.java
@@ -150,7 +150,7 @@ public class SiriusSessionDetailsPropertyPageTest extends AbstractSiriusSwtBotGe
         strBuilder.append("*** Resources\n");
         strBuilder.append("\n");
         strBuilder.append("Session Resources (1)\n");
-        strBuilder.append("  platform:/resource/DesignerTestProject/representations.aird - 173 elements - x bytes\n");
+        strBuilder.append("  platform:/resource/DesignerTestProject/representations.aird - 183 elements - x bytes\n");
         strBuilder.append("\n");
         strBuilder.append("Semantic Resources (1)\n");
         strBuilder.append("  platform:/resource/DesignerTestProject/My.ecore - 7 elements - x bytes\n");
@@ -164,31 +164,38 @@ public class SiriusSessionDetailsPropertyPageTest extends AbstractSiriusSwtBotGe
         strBuilder.append("\n");
         strBuilder.append("*** Representations\n");
         strBuilder.append("\n");
-        strBuilder.append("All representations: 3\n");
-        strBuilder.append("  Diagram: 2\n");
+        strBuilder.append("All representations: 5\n");
+        strBuilder.append("  Diagram: 4\n");
         strBuilder.append("  Sequence: 0\n");
         strBuilder.append("  EditionTable: 1\n");
         strBuilder.append("  CrossTable: 0\n");
         strBuilder.append("  Tree: 0\n");
         strBuilder.append("\n");
         strBuilder.append("Loaded representations:  3\n");
-        strBuilder.append("Representation elements in loaded representations:  22\n");
+        strBuilder.append("Representation elements in loaded representations:  15\n");
         strBuilder.append("\n");
-        strBuilder.append("Loaded representations containing elements with no semantic target (red cross decorator) (2)\n");
-        strBuilder.append("  root package entities BROKEN - uid: _X14A0Gu5EeucgZBzLx9xaw\n");
+        strBuilder.append("Loaded representations containing elements with no semantic target (red cross decorator) (1)\n");
         strBuilder.append("  Classes in root package - uid: _KjzRUGu6EeucgZBzLx9xaw\n");
         strBuilder.append(Messages.SessionQuery_LoadedBrokenRepsInfo + "\n");
         strBuilder.append("\n");
-        strBuilder.append("Invalid representations (0)\n");
+        strBuilder.append("Invalid representations (3)\n");
+        strBuilder.append("  no target package entities BROKEN NoTarget - uid: _XlP0gAj6Ee2OwOZgulCHPg\n");
+        strBuilder.append("  root package entities BROKEN NoRepPath - uid: _TMvtwAj7Ee2OwOZgulCHPg\n");
+        strBuilder.append("  root package entities BROKEN NoRep - uid: _Uf3ihgj7Ee2OwOZgulCHPg\n");
         strBuilder.append(Messages.SessionQuery_InvalidRepsInfo + "\n");
         strBuilder.append("\n");
-        strBuilder.append("Representation descriptors details (3)\n");
+        strBuilder.append("Representation descriptors details (5)\n");
         strBuilder.append(
                 "  root package entities - uid: _8t7_oGu3EeuuXbLvG4gakA - description: Entities - viewpoint: Design - repPath: platform:/resource/DesignerTestProject/representations.aird#_8tukQGu3EeuuXbLvG4gakA -> {eClass: ecore::EPackage, name: root}  [Loaded][Diagram]\n");
         strBuilder.append(
-                "  root package entities BROKEN - uid: _X14A0Gu5EeucgZBzLx9xaw - description: Entities - viewpoint: Design - repPath: platform:/resource/DesignerTestProject/representations.aird#_X1N5gGu5EeucgZBzLx9xaw -> {eClass: ecore::EPackage, name: root}  [Loaded][Diagram]\n");
-        strBuilder.append(
                 "  Classes in root package - uid: _KjzRUGu6EeucgZBzLx9xaw - description: Classes - viewpoint: Design - repPath: platform:/resource/DesignerTestProject/representations.aird#_Kh3-sGu6EeucgZBzLx9xaw -> {eClass: ecore::EPackage, name: root}  [Loaded][EditionTable]\n");
+        strBuilder.append(
+                "  no target package entities BROKEN NoTarget - uid: _XlP0gAj6Ee2OwOZgulCHPg - description: Entities - viewpoint: Design - repPath: platform:/resource/DesignerTestProject/representations.aird#_XlNYQAj6Ee2OwOZgulCHPg -> null  [Invalid][Loaded][Diagram]\n");
+        strBuilder.append(
+                "  root package entities BROKEN NoRepPath - uid: _TMvtwAj7Ee2OwOZgulCHPg - description: Entities - viewpoint: Design - repPath: null -> {eClass: ecore::EPackage, name: root}  [Invalid][Diagram]\n");
+        strBuilder.append(
+                "  root package entities BROKEN NoRep - uid: _Uf3ihgj7Ee2OwOZgulCHPg - description: Entities - viewpoint: Design - repPath: platform:/resource/DesignerTestProject/representations.aird#_Uf2UYAj7Ee2OwOZgulCHPg -> {eClass: ecore::EPackage, name: root}  [Invalid][Diagram]\n"
+        );
         strBuilder.append("\n");
         strBuilder.append("Representations opened in an editor (1)\n");
         strBuilder.append("  root package entities - uid: _8t7_oGu3EeuuXbLvG4gakA\n");
diff --git a/plugins/org.eclipse.sirius.ui/src/org/eclipse/sirius/ui/business/internal/session/SiriusSessionDetailsPropertyPage.java b/plugins/org.eclipse.sirius.ui/src/org/eclipse/sirius/ui/business/internal/session/SiriusSessionDetailsPropertyPage.java
index f93888ae6a..23b7eec422 100644
--- a/plugins/org.eclipse.sirius.ui/src/org/eclipse/sirius/ui/business/internal/session/SiriusSessionDetailsPropertyPage.java
+++ b/plugins/org.eclipse.sirius.ui/src/org/eclipse/sirius/ui/business/internal/session/SiriusSessionDetailsPropertyPage.java
@@ -107,7 +107,11 @@ public class SiriusSessionDetailsPropertyPage extends PropertyPage {
         informations.append(cr + MessageFormat.format(Messages.SiriusSessionDetailsPropertyPage_repOpenedInEditor, openedRepresentations.size()) + cr);
         openedRepresentations.stream().forEach(rep -> {
             informations.append(tab);
-            sessionQuery.addRepresentationDescriptorSimpleInfo(informations, new DRepresentationQuery(rep).getRepresentationDescriptor());
+            if (rep != null) {
+                sessionQuery.addRepresentationDescriptorSimpleInfo(informations, new DRepresentationQuery(rep).getRepresentationDescriptor());
+            } else {
+                informations.append("null"); //$NON-NLS-1$
+            }
             informations.append(cr);
         });
 
@@ -133,7 +137,7 @@ public class SiriusSessionDetailsPropertyPage extends PropertyPage {
                 String description = Messages.SiriusSessionDetailsPropertyPage_confirmComputingDependenciesDescriptionDialog;
                 String title = Messages.SiriusSessionDetailsPropertyPage_confirmComputingDependenciesTitleDialog;
                 Shell shell = Display.getCurrent().getActiveShell();
-                
+
                 boolean dialogChoice = MessageDialog.openQuestion(shell, title, description);
                 computeSessionDetails(Messages.SiriusSessionDetailsPropertyPage_computeDependenciesSessionDetails, dialogChoice);
                 computeDependenciesButton.setEnabled(!dialogChoice);
diff --git a/plugins/org.eclipse.sirius/src/org/eclipse/sirius/business/internal/query/SessionDetailsReport.java b/plugins/org.eclipse.sirius/src/org/eclipse/sirius/business/internal/query/SessionDetailsReport.java
index ade74b1d61..4128465c06 100644
--- a/plugins/org.eclipse.sirius/src/org/eclipse/sirius/business/internal/query/SessionDetailsReport.java
+++ b/plugins/org.eclipse.sirius/src/org/eclipse/sirius/business/internal/query/SessionDetailsReport.java
@@ -49,6 +49,7 @@ import org.eclipse.sirius.business.api.query.DRepresentationElementQuery;
 import org.eclipse.sirius.business.api.query.DRepresentationQuery;
 import org.eclipse.sirius.business.api.query.EObjectQuery;
 import org.eclipse.sirius.business.api.query.URIQuery;
+import org.eclipse.sirius.business.api.resource.ResourceDescriptor;
 import org.eclipse.sirius.business.api.session.Session;
 import org.eclipse.sirius.ext.base.Option;
 import org.eclipse.sirius.tools.api.Messages;
@@ -304,10 +305,20 @@ public final class SessionDetailsReport {
             informations.append("description: null"); //$NON-NLS-1$
         }
         informations.append(SEPARATOR);
-        informations.append("repPath: "); //$NON-NLS-1$
-        informations.append(repDescriptor.getRepPath().toString());
+        ResourceDescriptor repPath = repDescriptor.getRepPath();
+        if (repPath != null) {
+            informations.append("repPath: "); //$NON-NLS-1$
+            informations.append(repPath.toString());
+        } else {
+            informations.append("repPath: null"); //$NON-NLS-1$
+        }
         informations.append(ARROW);
-        informations.append(new EObjectQuery(repDescriptor.getTarget()).getGenericDecription());
+        EObject target = repDescriptor.getTarget();
+        if (target != null) {
+            informations.append(new EObjectQuery(target).getGenericDecription());
+        } else {
+            informations.append("null"); //$NON-NLS-1$
+        }
         informations.append(TAB);
         informations.append(repDescToTags.get(repDescriptor));
     }