From b8d79a92dc7c7e86275523bccbfa2e677d22ed03 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E1=B5=8F=E2=82=87=E2=82=85=C2=BE=C2=BD=E1=B4=AE=CE=A0?=
 =?UTF-8?q?=E2=82=85=E1=B4=B9=CE=BC=E2=82=83=CE=9B=E1=B5=8F1=E2=82=92?=
 =?UTF-8?q?=E2=82=8D=E2=85=92=CE=B2=E1=B4=B05=E1=B5=9B?= <a@b.c>
Date: Wed, 11 Jun 2025 06:56:39 -0500
Subject: [PATCH] add proper module support which has been kissing for over 8
 years now, cant believe im having to fix that old yacht owning bastards crap

---
 .../AbstractJavaProjectConfigurator.java      | 20 +++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

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 c52709a09..9bb86bb49 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
@@ -28,6 +28,7 @@
 import java.util.Set;
 import java.util.function.Predicate;
 import java.util.stream.Stream;
+import java.util.Arrays;
 
 import org.osgi.framework.Version;
 import org.slf4j.Logger;
@@ -41,6 +42,7 @@
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.NullProgressMonitor;
 import org.eclipse.core.runtime.QualifiedName;
 import org.eclipse.core.runtime.SubMonitor;
 import org.eclipse.jdt.core.IAccessRule;
@@ -167,7 +169,7 @@ public void configure(ProjectConfigurationRequest request, IProgressMonitor moni
     String executionEnvironmentId = getExecutionEnvironmentId(options);
     addJREClasspathContainer(classpath, executionEnvironmentId);
 
-    addMavenClasspathContainer(classpath);
+    addMavenClasspathContainer(javaProject, classpath);
 
     addCustomClasspathEntries(javaProject, classpath);
 
@@ -259,8 +261,8 @@ private IExecutionEnvironment getExecutionEnvironment(String environmentId) {
         environmentId);
     return null;
   }
-
-  protected void addMavenClasspathContainer(IClasspathDescriptor classpath) {
+  
+  protected void addMavenClasspathContainer(IJavaProject javaProject, IClasspathDescriptor classpath) {
     List<IClasspathEntryDescriptor> descriptors = classpath.getEntryDescriptors();
     List<IAccessRule> accessRules = new ArrayList<>();
     boolean isExported = false;
@@ -278,7 +280,15 @@ protected void addMavenClasspathContainer(IClasspathDescriptor classpath) {
     // ensure the external annotation path is kept
     IClasspathAttribute[] externalAnnotations = readExternalAnnotationAttributes(classpath,
         p -> MavenClasspathHelpers.MAVEN_CLASSPATH_CONTAINER_PATH.equals(p.getPath()));
-    IClasspathEntry cpe = MavenClasspathHelpers.getDefaultContainerEntry(externalAnnotations);
+    
+    // Add module attribute if project has module-info.java
+    IClasspathAttribute[] attributes = externalAnnotations;
+    if (ModuleSupport.getModuleInfo(javaProject, new NullProgressMonitor()) != null) {
+      attributes = Arrays.copyOf(externalAnnotations, externalAnnotations.length + 1);
+      attributes[externalAnnotations.length] = JavaCore.newClasspathAttribute(IClasspathAttribute.MODULE, "true");
+    }
+    
+    IClasspathEntry cpe = MavenClasspathHelpers.getDefaultContainerEntry(attributes);
 
     // add new entry without removing existing entries first, see bug398121
     IClasspathEntryDescriptor entryDescriptor = classpath.addEntry(cpe);
@@ -288,6 +298,8 @@ protected void addMavenClasspathContainer(IClasspathDescriptor classpath) {
     }
   }
 
+
+
   private static IClasspathAttribute[] readExternalAnnotationAttributes(IClasspathDescriptor classpath,
       Predicate<IClasspathEntryDescriptor> annotationSourceEntry) {
     Optional<String> annotationPath = classpath.getEntryDescriptors().stream().filter(annotationSourceEntry)