Skip fenced comments in HQL, EQL and JPQL parsers.

Align with Hibernate and allow comments also in EQL and JPQL.

Closes #3997

Author: mp911de

spring-data-jpa/src/main/antlr4/org/springframework/data/jpa/repository/query/Eql.g4

@@ -859,6 +859,7 @@ reserved_word
 
 
 WS                          : [ \t\r\n] -> channel(HIDDEN) ;
+COMMENT                     : '/*' (~'*' | '*' ~'/' )* '*/' -> skip;
 
 // Build up case-insentive tokens
 

spring-data-jpa/src/main/antlr4/org/springframework/data/jpa/repository/query/Hql.g4

@@ -1561,6 +1561,7 @@ identifier
 
 
 WS                          : [ \t\r\n] -> channel(HIDDEN);
+COMMENT                     : '/*' (~'*' | '*' ~'/' )* '*/' -> skip;
 
 // Build up case-insentive tokens
 

spring-data-jpa/src/main/antlr4/org/springframework/data/jpa/repository/query/Jpql.g4

@@ -846,6 +846,7 @@ reserved_word
 
 
 WS                          : [ \t\r\n] -> channel(HIDDEN) ;
+COMMENT                     : '/*' (~'*' | '*' ~'/' )* '*/' -> skip;
 
 // Build up case-insentive tokens
 

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryEnhancer.java

@@ -228,7 +228,7 @@ public Set<String> getJoinAliases() {
 	 */
 	@Override
 	public DeclaredQuery getQuery() {
-		throw new UnsupportedOperationException();
+		return DeclaredQuery.of(applySorting(Sort.unsorted()), false);
 	}
 
 	/**

spring-data-jpa/src/test/java/org/springframework/data/jpa/repository/query/JpaQueryEnhancerUnitTests.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed 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
+ *
+ *      https://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 org.springframework.data.jpa.repository.query;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+/**
+ * Unit tests for {@link JpaQueryEnhancer}.
+ *
+ * @author Mark Paluch
+ */
+class JpaQueryEnhancerUnitTests {
+
+	@ParameterizedTest // GH-3997
+	@MethodSource("queryEnhancers")
+	void shouldRemoveCommentsFromJpql(Function<DeclaredQuery, JpaQueryEnhancer> enhancerFunction) {
+
+		QueryEnhancer enhancer = enhancerFunction
+				.apply(DeclaredQuery.of("SELECT /* foo */ some_alias FROM /* some other */ table_name some_alias", false));
+
+		assertThat(enhancer.getQuery().getQueryString())
+				.isEqualToIgnoringCase("SELECT some_alias FROM table_name some_alias");
+
+		enhancer = enhancerFunction.apply(DeclaredQuery.of("""
+				SELECT /* multi
+				line
+				comment
+				*/ some_alias FROM /* some other */ table_name some_alias
+				""", false));
+
+		assertThat(enhancer.getQuery().getQueryString())
+				.isEqualToIgnoringCase("SELECT some_alias FROM table_name some_alias");
+	}
+
+	static Stream<Function<DeclaredQuery, JpaQueryEnhancer>> queryEnhancers() {
+		return Stream.of(JpaQueryEnhancer::forHql, JpaQueryEnhancer::forEql, JpaQueryEnhancer::forJpql);
+	}
+}