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Consider Void.class a primitive wrapper in ClassUtils

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Prior to this commit, ClassUtils.isPrimitiveOrWrapper() and
ClassUtils.isPrimitiveWrapper() did not return true for Void.class.
However, ClassUtils.isPrimitiveOrWrapper() did return true for
void.class. This lacking symmetry is inconsistent and can lead to bugs
in reflective code.

See: https://github.com/spring-projects/spring-data-r2dbc/issues/159

This commit addresses this by adding an entry for Void.class -> void.class
in the internal primitiveWrapperTypeMap in ClassUtils.

Closes gh-23572
This commit is contained in:
Sam Brannen
2019-09-03 13:55:56 +02:00
parent f748b1e68d
commit f37ec90f2f
4 changed files with 56 additions and 8 deletions
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12
spring-core/src/main/java/org/springframework/util/ClassUtils.java
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@@ -120,6 +120,7 @@ public abstract class ClassUtils {
primitiveWrapperTypeMap.put(Integer.class, int.class);
primitiveWrapperTypeMap.put(Long.class, long.class);
primitiveWrapperTypeMap.put(Short.class, short.class);
primitiveWrapperTypeMap.put(Void.class, void.class);
// Map entry iteration is less expensive to initialize than forEach with lambdas
for (Map.Entry<Class<?>, Class<?>> entry : primitiveWrapperTypeMap.entrySet()) {
@@ -462,7 +463,8 @@ public abstract class ClassUtils {
/**
* Check if the given class represents a primitive wrapper,
* i.e. Boolean, Byte, Character, Short, Integer, Long, Float, or Double.
* i.e. Boolean, Byte, Character, Short, Integer, Long, Float, Double, or
* Void.
* @param clazz the class to check
* @return whether the given class is a primitive wrapper class
*/
@@ -473,10 +475,12 @@ public abstract class ClassUtils {
/**
* Check if the given class represents a primitive (i.e. boolean, byte,
* char, short, int, long, float, or double) or a primitive wrapper
* (i.e. Boolean, Byte, Character, Short, Integer, Long, Float, or Double).
* char, short, int, long, float, or double), {@code void}, or a wrapper for
* those types (i.e. Boolean, Byte, Character, Short, Integer, Long, Float,
* Double, or Void).
* @param clazz the class to check
* @return whether the given class is a primitive or primitive wrapper class
* @return {@code true} if the given class represents a primitive, void, or
* a wrapper class
*/
public static boolean isPrimitiveOrWrapper(Class<?> clazz) {
Assert.notNull(clazz, "Class must not be null");