From c80b19d3e5e3ceb95b967d76fec4033f533d57cd Mon Sep 17 00:00:00 2001
From: Konrad Windszus <konrad_w@gmx.de>
Date: Fri, 9 Dec 2022 12:27:26 +0100
Subject: [PATCH] Accept invalid version ranges passed to m-enforcer-p

This closes #1120
---
 .../m2e/jdt/internal/AbstractJavaProjectConfigurator.java    | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/org.eclipse.m2e.jdt/src/org/eclipse/m2e/jdt/internal/AbstractJavaProjectConfigurator.java b/org.eclipse.m2e.jdt/src/org/eclipse/m2e/jdt/internal/AbstractJavaProjectConfigurator.java
index 09a7654f00..5a991ecbf2 100644
--- a/org.eclipse.m2e.jdt/src/org/eclipse/m2e/jdt/internal/AbstractJavaProjectConfigurator.java
+++ b/org.eclipse.m2e.jdt/src/org/eclipse/m2e/jdt/internal/AbstractJavaProjectConfigurator.java
@@ -907,6 +907,11 @@ private static List<Restriction> getVersionRangeRestrictionsIgnoringMicroAndQual
   }
 
   private static ArtifactVersion getMajorMinorOnlyVersion(ArtifactVersion lower) {
+    if(lower.getMajorVersion() == 0) {
+      // probably invalid range (e.g. "1,2,3", but accepted by maven-enforcer-plugin, just take the original
+      // to imitate m-e-p behaviour
+      return lower;
+    }
     return new DefaultArtifactVersion(lower.getMajorVersion() + "." + lower.getMinorVersion());
   }