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Workaround for generic parameter types on inner class constructors 

Issue: SPR-16734
This commit is contained in:
Juergen Hoeller 2018-04-17 14:32:54 +02:00
parent a2a8d0c754
commit 51be8a7303
2 changed files with 36 additions and 11 deletions
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22
spring-core/src/main/java/org/springframework/core/MethodParameter.java
View File

@ -419,7 +419,18 @@ public class MethodParameter {
paramType = (method != null ? method.getGenericReturnType() : void.class);
}
else {
paramType = this.executable.getGenericParameterTypes()[this.parameterIndex];
Type[] genericParameterTypes = this.executable.getGenericParameterTypes();
int index = this.parameterIndex;
if (this.executable instanceof Constructor &&
ClassUtils.isInnerClass(this.executable.getDeclaringClass()) &&
genericParameterTypes.length == this.executable.getParameterCount() - 1) {
// Bug in javac: type array excludes enclosing instance parameter
// for inner classes with at least one generic constructor parameter,
// so access it with the actual parameter index lowered by 1
index = this.parameterIndex - 1;
}
paramType = (index >= 0 && index < genericParameterTypes.length ?
genericParameterTypes[index] : getParameterType());
}
this.genericParameterType = paramType;
}
@ -525,12 +536,8 @@ public class MethodParameter {
// 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 = EMPTY_ANNOTATION_ARRAY;
}
paramAnns = (index >= 0 && index < annotationArray.length ?
adaptAnnotationArray(annotationArray[index]) : EMPTY_ANNOTATION_ARRAY);
this.parameterAnnotations = paramAnns;
}
return paramAnns;
@ -770,7 +777,6 @@ public class MethodParameter {
}
return false;
}
}
}

25
spring-core/src/test/java/org/springframework/core/MethodParameterTests.java
View File

@ -22,6 +22,7 @@ import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.concurrent.Callable;
import org.junit.Before;
import org.junit.Test;
@ -114,7 +115,7 @@ public class MethodParameterTests {
@Test // SPR-16652
public void annotatedConstructorParameterInInnerClass() throws Exception {
Constructor<?> constructor = InnerClass.class.getConstructor(getClass(), String.class, Integer.class);
Constructor<?> constructor = InnerClass.class.getConstructor(getClass(), String.class, Callable.class);
MethodParameter methodParameter = MethodParameter.forExecutable(constructor, 0);
assertEquals(getClass(), methodParameter.getParameterType());
@ -125,10 +126,28 @@ public class MethodParameterTests {
assertNotNull("Failed to find @Param annotation", methodParameter.getParameterAnnotation(Param.class));
methodParameter = MethodParameter.forExecutable(constructor, 2);
assertEquals(Integer.class, methodParameter.getParameterType());
assertEquals(Callable.class, methodParameter.getParameterType());
assertNull(methodParameter.getParameterAnnotation(Param.class));
}
@Test // SPR-16734
public void genericConstructorParameterInInnerClass() throws Exception {
Constructor<?> constructor = InnerClass.class.getConstructor(getClass(), String.class, Callable.class);
MethodParameter methodParameter = MethodParameter.forExecutable(constructor, 0);
assertEquals(getClass(), methodParameter.getParameterType());
assertEquals(getClass(), methodParameter.getGenericParameterType());
methodParameter = MethodParameter.forExecutable(constructor, 1);
assertEquals(String.class, methodParameter.getParameterType());
assertEquals(String.class, methodParameter.getGenericParameterType());
methodParameter = MethodParameter.forExecutable(constructor, 2);
assertEquals(Callable.class, methodParameter.getParameterType());
assertEquals(ResolvableType.forClassWithGenerics(Callable.class, Integer.class).getType(),
methodParameter.getGenericParameterType());
}
public int method(String p1, long p2) {
return 42;
@ -144,7 +163,7 @@ public class MethodParameterTests {
@SuppressWarnings("unused")
private class InnerClass {
public InnerClass(@Param String s, Integer i) {
public InnerClass(@Param String s, Callable<Integer> i) {
}
}