HHH-10172 - Throw MappingException when entity/component class defines multiple matching getters by stem name

hibernate-core/src/main/java/org/hibernate/internal/util/ReflectHelper.java

@@ -426,18 +426,21 @@ public final class ReflectHelper {
 
 			// try "get"
 			if ( methodName.startsWith( "get" ) ) {
-				String testStdMethod = Introspector.decapitalize( methodName.substring( 3 ) );
-				String testOldMethod = methodName.substring( 3 );
-				if ( testStdMethod.equals( propertyName ) || testOldMethod.equals( propertyName ) ) {
+				final String stemName = methodName.substring( 3 );
+				final String decapitalizedStemName = Introspector.decapitalize( stemName );
+				if ( stemName.equals( propertyName ) || decapitalizedStemName.equals( propertyName ) ) {
+					verifyNoIsVariantExists( containerClass, propertyName, method, stemName );
 					return method;
 				}
+
 			}
 
 			// if not "get", then try "is"
 			if ( methodName.startsWith( "is" ) ) {
-				String testStdMethod = Introspector.decapitalize( methodName.substring( 2 ) );
-				String testOldMethod = methodName.substring( 2 );
-				if ( testStdMethod.equals( propertyName ) || testOldMethod.equals( propertyName ) ) {
+				final String stemName = methodName.substring( 2 );
+				String decapitalizedStemName = Introspector.decapitalize( stemName );
+				if ( stemName.equals( propertyName ) || decapitalizedStemName.equals( propertyName ) ) {
+					verifyNoGetVariantExists( containerClass, propertyName, method, stemName );
 					return method;
 				}
 			}
@@ -446,6 +449,60 @@ public final class ReflectHelper {
 		return null;
 	}
 
+	private static void verifyNoIsVariantExists(
+			Class containerClass,
+			String propertyName,
+			Method getMethod,
+			String stemName) {
+		// verify that the Class does not also define a method with the same stem name with 'is'
+		try {
+			final Method isMethod = containerClass.getDeclaredMethod( "is" + stemName );
+			// No such method should throw the caught exception.  So if we get here, there was
+			// such a method.
+			checkGetAndIsVariants( containerClass, propertyName, getMethod, isMethod );
+		}
+		catch (NoSuchMethodException ignore) {
+		}
+	}
+
+	private static void checkGetAndIsVariants(
+			Class containerClass,
+			String propertyName,
+			Method getMethod,
+			Method isMethod) {
+		// Check the return types.  If they are the same, its ok.  If they are different
+		// we are in a situation where we could not reasonably know which to use.
+		if ( !isMethod.getReturnType().equals( getMethod.getReturnType() ) ) {
+			throw new MappingException(
+					String.format(
+							Locale.ROOT,
+							"In trying to locate getter for property [%s], Class [%s] defined " +
+									"both a `get` [%s] and `is` [%s] variant",
+							propertyName,
+							containerClass.getName(),
+							getMethod.toString(),
+							isMethod.toString()
+					)
+			);
+		}
+	}
+
+	private static void verifyNoGetVariantExists(
+			Class containerClass,
+			String propertyName,
+			Method isMethod,
+			String stemName) {
+		// verify that the Class does not also define a method with the same stem name with 'is'
+		try {
+			final Method getMethod = containerClass.getDeclaredMethod( "get" + stemName );
+			// No such method should throw the caught exception.  So if we get here, there was
+			// such a method.
+			checkGetAndIsVariants( containerClass, propertyName, getMethod, isMethod );
+		}
+		catch (NoSuchMethodException ignore) {
+		}
+	}
+
 	public static Method findSetterMethod(Class containerClass, String propertyName, Class propertyType) {
 		Class checkClass = containerClass;
 		Method setter = null;

hibernate-core/src/test/java/org/hibernate/property/GetAndIsVariantGetterTest.java

@@ -0,0 +1,83 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.property;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+import org.hibernate.MappingException;
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistry;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+
+import org.hibernate.testing.TestForIssue;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import static org.junit.Assert.fail;
+
+/**
+ * Originally written to verify fix for HHH-10172
+ *
+ * @author Steve Ebersole
+ */
+public class GetAndIsVariantGetterTest {
+	private static StandardServiceRegistry ssr;
+
+	@BeforeClass
+	public static void prepare() {
+		ssr = new StandardServiceRegistryBuilder(  ).build();
+	}
+
+	@AfterClass
+	public static void release() {
+		if ( ssr != null ) {
+			StandardServiceRegistryBuilder.destroy( ssr );
+		}
+	}
+
+	@Test
+	@TestForIssue( jiraKey = "HHH-10172" )
+	public void testHbmXml() {
+		try {
+			new MetadataSources( ssr )
+					.addResource( "org/hibernate/property/TheEntity.hbm.xml" )
+					.buildMetadata();
+			fail( "Expecting a failure" );
+		}
+		catch (MappingException ignore) {
+			// expected
+		}
+	}
+
+	@Test
+	@TestForIssue( jiraKey = "HHH-10172" )
+	public void testAnnotations() {
+		new MetadataSources( ssr )
+				.addAnnotatedClass( TheEntity.class )
+				.buildMetadata();
+	}
+
+	@Entity
+	public static class TheEntity {
+		private Integer id;
+
+		public boolean isId() {
+			return false;
+		}
+
+		@Id
+		public Integer getId() {
+			return id;
+		}
+
+		public void setId(Integer id) {
+			this.id = id;
+		}
+	}
+}

hibernate-core/src/test/resources/org/hibernate/property/TheEntity.hbm.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+<!--
+  ~ Hibernate, Relational Persistence for Idiomatic Java
+  ~
+  ~ License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+  ~ See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+  -->
+<hibernate-mapping xmlns="http://www.hibernate.org/xsd/hibernate-mapping">
+    <class name="org.hibernate.property.GetAndIsVariantGetterTest$TheEntity">
+        <id name="id"/>
+    </class>
+</hibernate-mapping>