From 91b18862d4387b432263ba4026f1cd7e1079f37b Mon Sep 17 00:00:00 2001
From: Nils Homer <nilshomer@gmail.com>
Date: Mon, 10 Jul 2017 14:35:26 -0700
Subject: [PATCH] Better error message when dictionaries differ in GatherVcfs.

---
 src/main/java/picard/vcf/GatherVcfs.java | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/main/java/picard/vcf/GatherVcfs.java b/src/main/java/picard/vcf/GatherVcfs.java
index 729fb616d..d2879f346 100644
--- a/src/main/java/picard/vcf/GatherVcfs.java
+++ b/src/main/java/picard/vcf/GatherVcfs.java
@@ -106,7 +106,13 @@ private static void assertSameSamplesAndValidOrdering(final List<File> inputFile
 
         for (final File f : inputFiles) {
             final VCFFileReader in = new VCFFileReader(f, false);
-            dict.assertSameDictionary(in.getFileHeader().getSequenceDictionary());
+            try {
+                dict.assertSameDictionary(in.getFileHeader().getSequenceDictionary());
+            } catch (final AssertionError e) {
+                log.error("File #1: " + inputFiles.get(0));
+                log.error("File #2: " + f);
+                throw e;
+            }
             final List<String> theseSamples = in.getFileHeader().getGenotypeSamples();
 
             if (!samples.equals(theseSamples)) {