Merge branch '5.2.x'

# Conflicts:
#	spring-expression/src/main/java/org/springframework/expression/spel/ast/MethodReference.java

spring-expression/src/test/java/org/springframework/expression/spel/standard/SpelCompilerTests.java

@@ -38,7 +38,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 class SpelCompilerTests {
 
-	@Test // gh-24357
+	@Test  // gh-24357
 	void expressionCompilesWhenMethodComesFromPublicInterface() {
 		SpelParserConfiguration config = new SpelParserConfiguration(SpelCompilerMode.IMMEDIATE, null);
 		SpelExpressionParser parser = new SpelExpressionParser(config);
@@ -50,6 +50,31 @@ class SpelCompilerTests {
 		IntStream.rangeClosed(1, 5).forEach(i -> assertThat(expression.getValue(component)).isEqualTo(42));
 	}
 
+	@Test  // gh-25706
+	void defaultMethodInvocation() {
+		SpelParserConfiguration config = new SpelParserConfiguration(SpelCompilerMode.IMMEDIATE, null);
+		SpelExpressionParser parser = new SpelExpressionParser(config);
+
+		StandardEvaluationContext context = new StandardEvaluationContext();
+		Item item = new Item();
+		context.setRootObject(item);
+
+		Expression expression = parser.parseExpression("#root.isEditable2()");
+		assertThat(SpelCompiler.compile(expression)).isFalse();
+		assertThat(expression.getValue(context)).isEqualTo(false);
+		assertThat(SpelCompiler.compile(expression)).isTrue();
+		SpelCompilationCoverageTests.assertIsCompiled(expression);
+		assertThat(expression.getValue(context)).isEqualTo(false);
+
+		context.setVariable("user", new User());
+		expression = parser.parseExpression("#root.isEditable(#user)");
+		assertThat(SpelCompiler.compile(expression)).isFalse();
+		assertThat(expression.getValue(context)).isEqualTo(true);
+		assertThat(SpelCompiler.compile(expression)).isTrue();
+		SpelCompilationCoverageTests.assertIsCompiled(expression);
+		assertThat(expression.getValue(context)).isEqualTo(true);
+	}
+
 
 	static class OrderedComponent implements Ordered {
 
@@ -114,4 +139,40 @@ class SpelCompilerTests {
 	   boolean hasSomeProperty();
 	}
 
+
+	public static class User {
+
+		boolean isAdmin() {
+			return true;
+		}
+	}
+
+
+	public static class Item implements Editable {
+
+		// some fields
+		private String someField = "";
+
+		// some getters and setters
+
+		@Override
+		public boolean hasSomeProperty() {
+			return someField != null;
+		}
+	}
+
+
+	public interface Editable {
+
+		default boolean isEditable(User user) {
+			return user.isAdmin() && hasSomeProperty();
+		}
+
+		default boolean isEditable2() {
+			return false;
+		}
+
+		boolean hasSomeProperty();
+	}
+
 }