为什么PowerMock使用Whitebox.invokeConstructor()的示例会抛出ConstructorNotFoundException？

Question

当我尝试使用PowerMock 1.5.2(我们在我的公司使用)运行PowerMock的旁路封装文档中的第二个示例时，我立即得到一个ConstructorNotFoundException抛出。我试着切换到1.6.2版本，结果是一样的。

知道我可能做错了什么吗?(例如，我没有使用任何PowerMock注释，并且正在运行Java 1.7。)我敢肯定这一定是我的疏忽……

下面是我对文档中示例的POM:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>PowerMock</artifactId>
    <version>1.0-SNAPSHOT</version>
<dependencies>
    <dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-mockito-release-full</artifactId>
        <version>1.6.2</version>
    </dependency>
</dependencies>
</project>

下面是测试类:

import org.powermock.reflect.Whitebox;
public class Test {
    @org.junit.Test
    public void test() throws Exception {
        PrivateConstructorInstantiationDemo instance = Whitebox.invokeConstructor(PrivateConstructorInstantiationDemo.class, new Class<?>[]{Integer.class}, 43);
        System.out.println();
    }
}

这里有一个例外:

org.powermock.reflect.exceptions。ConstructorNotFoundException:失败[[Ljava.lang.Class;，. lang。整数)org.powermock.reflect.internal.WhiteboxImpl.invokeConstructor (WhiteboxImpl.java: 1354)在org.powermock.reflect.Whitebox.invokeConstructor (Whitebox.java: 511)

任何想法?

Answer 1

这一定是示例中的错误。看看public static <T> T invokeConstructor(Class<T> classThatContainsTheConstructorToTest, Class<?>[] parameterTypes, Object[] arguments)的签名，您应该传递一个对象数组作为最后一个参数。为了说明这一点，我稍微修改了一下示例。

测试

:

@org.junit.Test
public void test() throws Exception {
    PrivateConstructorInstantiationDemo instance1 = Whitebox.invokeConstructor(PrivateConstructorInstantiationDemo.class, new Class<?>[]{Integer.TYPE}, new Object[]{43});
    PrivateConstructorInstantiationDemo instance2 = Whitebox.invokeConstructor(PrivateConstructorInstantiationDemo.class, new Class<?>[]{Integer.class}, new Object[]{43});
    System.out.println();
}

类:

public static class PrivateConstructorInstantiationDemo {
   private final int state;
   private PrivateConstructorInstantiationDemo(int state) {
       this.state = state;
       System.out.println("int " + state);
   }
   private PrivateConstructorInstantiationDemo(Integer state) {
       this.state = state;
       System.out.println("Integer " + state);
       // do something else
   }
   public int getState() {
       return state;
   }
}

测试输出:

int 43
Integer 43