From 4ea22f76016a4ec21f6b46a2144629de4adeb026 Mon Sep 17 00:00:00 2001
From: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Date: Mon, 30 Mar 2026 09:32:37 +0000
Subject: [PATCH] Fix server crash when File-Based Debug Logger is enabled

---
 opendj-core/src/main/java/org/forgerock/opendj/ldap/spi/LdapMessages.java          |    7 +++++++
 opendj-server-legacy/src/main/java/org/opends/server/core/LoggerConfigManager.java |    7 ++++++-
 2 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/opendj-core/src/main/java/org/forgerock/opendj/ldap/spi/LdapMessages.java b/opendj-core/src/main/java/org/forgerock/opendj/ldap/spi/LdapMessages.java
index b4603a2..23fe1c6 100644
--- a/opendj-core/src/main/java/org/forgerock/opendj/ldap/spi/LdapMessages.java
+++ b/opendj-core/src/main/java/org/forgerock/opendj/ldap/spi/LdapMessages.java
@@ -106,6 +106,13 @@
         private LdapResponseMessage(final byte messageType, final int messageId, final Response content) {
             super(messageType, messageId, content);
         }
+
+        @Override
+        public String toString() {
+            return "LdapResponseMessage(messageType=" + getMessageType()
+                    + ", messageId=" + getMessageId()
+                    + ", content=" + getContent() + ")";
+        }
     }
 
     private static abstract class LdapMessageEnvelope<T> {
diff --git a/opendj-server-legacy/src/main/java/org/opends/server/core/LoggerConfigManager.java b/opendj-server-legacy/src/main/java/org/opends/server/core/LoggerConfigManager.java
index 7bfe1ef..af77296 100644
--- a/opendj-server-legacy/src/main/java/org/opends/server/core/LoggerConfigManager.java
+++ b/opendj-server-legacy/src/main/java/org/opends/server/core/LoggerConfigManager.java
@@ -109,8 +109,13 @@
       {
         SLF4JBridgeHandler.removeHandlersForRootLogger();
         // This is needed to avoid major performance issue. See: http://www.slf4j.org/legacy.html#jul-to-slf4j
+        // Limit Grizzly JUL logging to FINE to prevent a ClassCastException in
+        // FilterChainContext.toString() (Grizzly bug) when debug logging is enabled.
+        // Grizzly 3.0.1 DefaultFilterChain.executeFilter() checks isLoggable(FINEST) but
+        // its FilterChainContext.toString() incorrectly casts the message to char[].
         LogManager.getLogManager().readConfiguration(
-                new ByteArrayInputStream((".level=" + newLevel).getBytes()));
+                new ByteArrayInputStream(
+                        (".level=" + newLevel + "\norg.glassfish.grizzly.level=FINE").getBytes()));
         SLF4JBridgeHandler.install();
         currentJulLogLevel = newLevel;
       }

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