From 8770544769367b780b3667b832920c78d4a87611 Mon Sep 17 00:00:00 2001
From: Sam Brannen <sam@sambrannen.com>
Date: Sun, 29 Oct 2023 11:55:36 +0100
Subject: [PATCH] Remove classpath entries for non-existent libraries added by
 mrjar plugin

The me.champeau.mrjar Gradle plugin causes non-existent libraries to be
added to the Eclipse classpath, such as:

<classpathentry kind="lib" path="/workspaces/spring-framework/spring-core/build/classes/kotlin/java21">
  <attributes>
    <attribute name="gradle_used_by_scope" value="java21"/>
    <attribute name="test" value="true"/>
  </attributes>
</classpathentry>

This results in build errors in Eclipse IDE like the following.

Project 'spring-core' is missing required library:
  '/workspaces/spring-framework/spring-core/build/classes/kotlin/java21'

This commit filters those and removes them.
---
 gradle/ide.gradle | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gradle/ide.gradle b/gradle/ide.gradle
index 435b1ca6af..2dcc141e81 100644
--- a/gradle/ide.gradle
+++ b/gradle/ide.gradle
@@ -1,3 +1,4 @@
+import org.gradle.plugins.ide.eclipse.model.Library
 import org.gradle.plugins.ide.eclipse.model.ProjectDependency
 import org.gradle.plugins.ide.eclipse.model.SourceFolder
 
@@ -67,6 +68,14 @@ eclipse.classpath.file.whenMerged {
 	}
 }
 
+// Remove classpath entries for non-existent libraries added by the me.champeau.mrjar
+// plugin, such as "spring-core/build/classes/kotlin/java21".
+eclipse.classpath.file.whenMerged {
+	entries.findAll { it instanceof Library && !file(it.path).exists() }.each {
+		entries.remove(it)
+	}
+}
+
 // Include project specific settings
 task eclipseSettings(type: Copy) {
 	from rootProject.files(