From c41560c7cd30f9ce5e79fd307763b1e6f9072817 Mon Sep 17 00:00:00 2001
From: Lachlan Roberts <lachlan@webtide.com>
Date: Tue, 26 May 2020 15:35:39 +1000
Subject: [PATCH] Issue #4903 - add cause to Exception when creating endpoint
 instance

Signed-off-by: Lachlan Roberts <lachlan@webtide.com>
---
 .../jsr356/server/ContainerDefaultConfigurator.java          | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/jetty-websocket/javax-websocket-server-impl/src/main/java/org/eclipse/jetty/websocket/jsr356/server/ContainerDefaultConfigurator.java b/jetty-websocket/javax-websocket-server-impl/src/main/java/org/eclipse/jetty/websocket/jsr356/server/ContainerDefaultConfigurator.java
index e25916d5170a..0fc08fe2622d 100644
--- a/jetty-websocket/javax-websocket-server-impl/src/main/java/org/eclipse/jetty/websocket/jsr356/server/ContainerDefaultConfigurator.java
+++ b/jetty-websocket/javax-websocket-server-impl/src/main/java/org/eclipse/jetty/websocket/jsr356/server/ContainerDefaultConfigurator.java
@@ -72,7 +72,10 @@ public <T> T getEndpointInstance(Class<T> endpointClass) throws InstantiationExc
         }
         catch (Exception e)
         {
-            throw new InstantiationException(String.format("%s: %s", e.getClass().getName(), e.getMessage()));
+            String errorMsg = String.format("%s: %s", e.getClass().getName(), e.getMessage());
+            InstantiationException instantiationException = new InstantiationException(errorMsg);
+            instantiationException.initCause(e);
+            throw instantiationException;
         }
     }