From 9ee76b6f410141f0df8de11f4e57214fceb21e2c Mon Sep 17 00:00:00 2001
From: Ryan Baxter <ryan.baxter@broadcom.com>
Date: Thu, 17 Sep 2026 16:22:46 -0400
Subject: [PATCH] Exclude logback-classic from generate-configprops plugin
 dependency

spring-cloud-build-docs is consumed via the jar-with-dependencies
classifier, which already bundles a matched logback-classic/
logback-core pair. exec-maven-plugin's includePluginDependencies
classpath merge also separately resolves the dependency's own
unversioned logback-classic, landing an old, incompatible
logback-classic/logback-core split across the uber jar and the
separately-resolved thin jar. Depending on classpath ordering this
intermittently fails generate-configprops with:

  java.lang.NoSuchMethodError: 'java.lang.ClassLoader
  ch.qos.logback.core.util.Loader.systemClassloaderIfNull(java.lang.ClassLoader)'

Excluding logback-classic (and transitively logback-core) forces the
classpath to rely solely on the bundled, self-consistent pair.
---
 pom.xml | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/pom.xml b/pom.xml
index cbbafa27..9fc13e39 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1248,6 +1248,20 @@
 									</version>
 									<classifier>${spring-cloud-build-docs-classifier}</classifier>
 									<type>jar</type>
+									<!-- The jar-with-dependencies classifier above already bundles a
+										 matched logback-classic/logback-core pair. Without this
+										 exclusion, exec-maven-plugin's includePluginDependencies
+										 classpath merge also resolves spring-cloud-build-docs' own
+										 unversioned logback-classic dependency separately, landing an
+										 old, incompatible logback-classic/logback-core split across the
+										 two jars and failing with a NoSuchMethodError depending on
+										 classpath ordering. -->
+									<exclusions>
+										<exclusion>
+											<groupId>ch.qos.logback</groupId>
+											<artifactId>logback-classic</artifactId>
+										</exclusion>
+									</exclusions>
 								</dependency>
 							</dependencies>
 							<configuration>