From 8caf09058da8dc8dbeff889c3e3218aef906e940 Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Fri, 7 Aug 2015 22:14:38 +0200
Subject: [PATCH] more diagnostics for missing dom child (EA-71453 - assert:
 DomInvocationHandler.getCollectionChildren)

---
 .../com/intellij/util/xml/impl/DomInvocationHandler.java  | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/xml/dom-impl/src/com/intellij/util/xml/impl/DomInvocationHandler.java b/xml/dom-impl/src/com/intellij/util/xml/impl/DomInvocationHandler.java
index a0529b60a8fc..9e155cf78d43 100644
--- a/xml/dom-impl/src/com/intellij/util/xml/impl/DomInvocationHandler.java
+++ b/xml/dom-impl/src/com/intellij/util/xml/impl/DomInvocationHandler.java
@@ -875,8 +875,12 @@ public abstract class DomInvocationHandler<T extends AbstractDomChildDescription
       final SemKey<? extends DomInvocationHandler> key = description instanceof CustomDomChildrenDescription ? DomManagerImpl.DOM_CUSTOM_HANDLER_KEY : DomManagerImpl.DOM_COLLECTION_HANDLER_KEY;
       final DomInvocationHandler semElement = myManager.getSemService().getSemElement(key, subTag);
       if (semElement == null) {
-        myManager.getSemService().getSemElement(key, subTag);
-        throw new AssertionError("No child for subTag '" + subTag.getName() + "' in tag '" + tag.getName() +"' using key " + key);
+        String msg = "No child for subTag '" + subTag.getName() + "' in tag '" + tag.getName() + "' using key " + key + "; subtag count=" + subTags.size();
+        DomInvocationHandler anyDom = myManager.getDomHandler(subTag);
+        if (anyDom != null) {
+          msg += "\n sub-dom=" + anyDom + " with " + anyDom.getChildDescription();
+        }
+        throw new AssertionError(msg);
       }
       else {
         elements.add(semElement.getProxy());