From fac232ecb45df8f307aa1df34822975f6793a53d Mon Sep 17 00:00:00 2001
From: Bartosz Popiela <bartoszpop@gmail.com>
Date: Fri, 27 Dec 2024 01:47:49 +0100
Subject: [PATCH] CAMEL-21572: fix java.lang.NullPointerException when using
 SetHeader and Stub

---
 .../org/apache/camel/support/builder/ExpressionBuilder.java     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/camel-support/src/main/java/org/apache/camel/support/builder/ExpressionBuilder.java b/core/camel-support/src/main/java/org/apache/camel/support/builder/ExpressionBuilder.java
index d860a9239d1fd..0dc5a361c2114 100644
--- a/core/camel-support/src/main/java/org/apache/camel/support/builder/ExpressionBuilder.java
+++ b/core/camel-support/src/main/java/org/apache/camel/support/builder/ExpressionBuilder.java
@@ -2123,7 +2123,7 @@ public void init(CamelContext context) {
                         expression.init(context);
                         if (expression instanceof ConstantExpressionAdapter constantExpressionAdapter) {
                             Object value = constantExpressionAdapter.getValue();
-                            preprocessedExpression.add(value.toString());
+                            preprocessedExpression.add(String.valueOf(value));
                         } else {
                             preprocessedExpression.add(expression);
                             constantsOnly = false;