Catch the StackOverflowError

Under some rare circumstances scopes may delegate to each other.
Normally this is either an error in the DSL implementation or in the
implementation of some concrete source(s). This should be handled
gracefully though.

Author: Maksim Rubanov

com.avaloq.tools.ddk.xtext/src/com/avaloq/tools/ddk/xtext/scoping/DelegatingScope.java

@@ -235,14 +235,19 @@ public IEObjectDescription getSingleElement(final QualifiedName name) {
     if (name == null) {
       throw new IllegalArgumentException("Null name in getContentByName"); //$NON-NLS-1$
     }
-    for (final IScope scope : getDelegates()) {
-      final IEObjectDescription elem = scope.getSingleElement(name);
-      if (elem != null) {
-        // ScopeTrace.addTrace(elem, getId());
-        return elem;
+
+    try {
+      for (final IScope scope : getDelegates()) {
+        final IEObjectDescription elem = scope.getSingleElement(name);
+        if (elem != null) {
+          // ScopeTrace.addTrace(elem, getId());
+          return elem;
+        }
       }
+      return getParent().getSingleElement(name);
+    } catch (StackOverflowError e) {
+      return STACK_OVERFLOW_EOBJECT_DESCRIPTION;
     }
-    return getParent().getSingleElement(name);
   }
 
   @Override