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emilles pushed a commit to branch GROOVY-10198
in repository https://gitbox.apache.org/repos/asf/groovy.git

commit 616e0302df19e2bfc3b88494faa6d973885412bf
Author: Eric Milles <[email protected]>
AuthorDate: Fri Nov 28 19:12:33 2025 -0600

    GROOVY-10198: ignore pickMethod result if private or package-private
---
 src/main/java/groovy/lang/MetaClassImpl.java |  6 +++-
 src/test/groovy/bugs/Groovy10198.groovy      | 51 ++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/src/main/java/groovy/lang/MetaClassImpl.java 
b/src/main/java/groovy/lang/MetaClassImpl.java
index 7306845de8..a334b1236a 100644
--- a/src/main/java/groovy/lang/MetaClassImpl.java
+++ b/src/main/java/groovy/lang/MetaClassImpl.java
@@ -3708,13 +3708,17 @@ out:    if (metaClass instanceof MetaClassImpl 
metaClassImpl) {
     protected static MetaMethod findOwnMethod(Class instanceKlazz, String 
methodName, Class[] arguments, MetaClass metaClass, MetaMethod method) {
         if (instanceKlazz != metaClass.getTheClass()) {
             MetaMethod ownMethod = metaClass.pickMethod(methodName, arguments);
-            if (ownMethod != null) {
+            if (ownMethod != null && !isPrivate(ownMethod, instanceKlazz)) { 
// GROOVY-10198
                 method = (method == null ? ownMethod : mostSpecific(method, 
ownMethod, instanceKlazz));
             }
         }
         return method;
     }
 
+    private static boolean isPrivate(MetaMethod method, Class instanceKlazz) {
+        return method.isPrivate() || (method.isPackagePrivate() && 
!inSamePackage(method.getDeclaringClass().getTheClass(), instanceKlazz));
+    }
+
     protected Object getSubclassMetaMethods(String methodName) {
         return null;
     }
diff --git a/src/test/groovy/bugs/Groovy10198.groovy 
b/src/test/groovy/bugs/Groovy10198.groovy
new file mode 100644
index 0000000000..66d74fb12f
--- /dev/null
+++ b/src/test/groovy/bugs/Groovy10198.groovy
@@ -0,0 +1,51 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package bugs
+
+import org.junit.jupiter.api.Test
+
+import static groovy.test.GroovyAssert.shouldFail
+
+final class Groovy10198 {
+
+    @Test
+    void testMetaClassChangeKeepsPrivate() {
+        def pogo = new Two()
+        shouldFail(MissingMethodException) {
+            def value = pogo.getValue()
+        }
+        One.metaClass.getThing << { -> 'thing' }
+        try {
+            shouldFail(MissingMethodException) {
+                def value = pogo.getValue()
+            }
+        } finally {
+            One.metaClass = null
+        }
+    }
+
+    static class One {
+        private String getValue() {
+            'something private'
+        }
+    }
+
+    static class Two extends One {
+    }
+}

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