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Code Issues Actions 6 Packages Projects Releases Wiki Activity

Workaround for inner class constructor parameter annotation bug in javac 

Issue: SPR-16652
This commit is contained in:
Juergen Hoeller 2018-03-29 15:45:02 +02:00
parent 3ac46da22f
commit 53d01392d7
2 changed files with 30 additions and 12 deletions
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20
spring-core/src/main/java/org/springframework/core/MethodParameter.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2002-2017 the original author or authors.
* Copyright 2002-2018 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.
@ -22,6 +22,7 @@ import java.lang.reflect.Constructor;
import java.lang.reflect.Executable;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Parameter;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
@ -57,6 +58,8 @@ import org.springframework.util.Assert;
*/
public class MethodParameter {
private static final Annotation[] EMPTY_ANNOTATION_ARRAY = new Annotation[0];
private final Executable executable;
private final int parameterIndex;
@ -514,11 +517,20 @@ public class MethodParameter {
Annotation[] paramAnns = this.parameterAnnotations;
if (paramAnns == null) {
Annotation[][] annotationArray = this.executable.getParameterAnnotations();
if (this.parameterIndex >= 0 && this.parameterIndex < annotationArray.length) {
paramAnns = adaptAnnotationArray(annotationArray[this.parameterIndex]);
int index = this.parameterIndex;
if (this.executable instanceof Constructor &&
this.executable.getDeclaringClass().isMemberClass() &&
!Modifier.isStatic(this.executable.getDeclaringClass().getModifiers()) &&
annotationArray.length == this.executable.getParameterCount() - 1) {
// Bug in javac in JDK <9: annotation array excludes enclosing instance parameter
// for inner classes, so access it with the actual parameter index lowered by 1
index = this.parameterIndex - 1;
}
if (index >= 0 && index < annotationArray.length) {
paramAnns = adaptAnnotationArray(annotationArray[index]);
}
else {
paramAnns = new Annotation[0];
paramAnns = EMPTY_ANNOTATION_ARRAY;
}
this.parameterAnnotations = paramAnns;
}

22
spring-core/src/test/java/org/springframework/core/MethodParameterTests.java
View File

@ -24,7 +24,6 @@ import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import static org.junit.Assert.*;
@ -46,7 +45,7 @@ public class MethodParameterTests {
@Before
public void setUp() throws NoSuchMethodException {
public void setup() throws NoSuchMethodException {
method = getClass().getMethod("method", String.class, Long.TYPE);
stringParameter = new MethodParameter(method, 0);
longParameter = new MethodParameter(method, 1);
@ -114,15 +113,22 @@ public class MethodParameterTests {
assertNotNull(methodParameter.getParameterAnnotation(Param.class));
}
@Test
@Ignore("Disabled until SPR-16652 is resolved")
@Test // SPR-16652
public void annotatedConstructorParameterInInnerClass() throws Exception {
Constructor<?> constructor = InnerClass.class.getDeclaredConstructor(getClass(), String.class);
MethodParameter methodParameter = MethodParameter.forExecutable(constructor, 1);
Constructor<?> constructor = InnerClass.class.getConstructor(getClass(), String.class, Integer.class);
MethodParameter methodParameter = MethodParameter.forExecutable(constructor, 0);
assertEquals(getClass(), methodParameter.getParameterType());
assertNull(methodParameter.getParameterAnnotation(Param.class));
methodParameter = MethodParameter.forExecutable(constructor, 1);
assertEquals(String.class, methodParameter.getParameterType());
assertNull(methodParameter.getParameterAnnotation(Override.class));
// The following assertion currently fails if this test class is compiled using JDK 8.
assertNotNull("Failed to find @Param annotation", methodParameter.getParameterAnnotation(Param.class));
methodParameter = MethodParameter.forExecutable(constructor, 2);
assertEquals(Integer.class, methodParameter.getParameterType());
assertNull(methodParameter.getParameterAnnotation(Param.class));
}
@ -140,7 +146,7 @@ public class MethodParameterTests {
@SuppressWarnings("unused")
private class InnerClass {
InnerClass(@Param String s) {
public InnerClass(@Param String s, Integer i) {
}
}