From 12832bed88caff888e1193d109d58ca1d7e9905e Mon Sep 17 00:00:00 2001
From: James Muehlner <james.muehlner@guac-dev.org>
Date: Wed, 6 Jul 2022 19:06:42 +0000
Subject: [PATCH] GUACAMOLE-1629: Use Java 8 compatible collector to append
 connection group attributes.

---
 .../org/apache/guacamole/vault/user/VaultUserContext.java   | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/extensions/guacamole-vault/modules/guacamole-vault-base/src/main/java/org/apache/guacamole/vault/user/VaultUserContext.java b/extensions/guacamole-vault/modules/guacamole-vault-base/src/main/java/org/apache/guacamole/vault/user/VaultUserContext.java
index 06ee8aaac..dbfbbb9cb 100644
--- a/extensions/guacamole-vault/modules/guacamole-vault-base/src/main/java/org/apache/guacamole/vault/user/VaultUserContext.java
+++ b/extensions/guacamole-vault/modules/guacamole-vault-base/src/main/java/org/apache/guacamole/vault/user/VaultUserContext.java
@@ -24,6 +24,7 @@ import com.google.inject.assistedinject.Assisted;
 import com.google.inject.assistedinject.AssistedInject;
 
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.ExecutionException;
@@ -430,10 +431,11 @@ public class VaultUserContext extends TokenInjectingUserContext {
     public Collection<Form> getConnectionGroupAttributes() {
 
         // Add any custom attributes to any previously defined attributes
-        return Stream.concat(
+        return Collections.unmodifiableCollection(Stream.concat(
                 super.getConnectionGroupAttributes().stream(),
                 attributeService.getConnectionGroupAttributes().stream()
-        ).collect(Collectors.toUnmodifiableList());
+        ).collect(Collectors.toList()));
+
     }
 
 }