为什么 PowerMock 使用 Whitebox.invokeConstructor() 的示例抛出 ConstructorNotFoundException?
Why does PowerMock's example for use of Whitebox.invokeConstructor() throw a ConstructorNotFoundException?
然后当我尝试 运行 PowerMock Bypass Encapsulation docs 的第二个示例时,使用 PowerMock 1.5.2(我们在我的公司使用),我立即得到一个 ConstructorNotFoundException
抛出.我尝试切换到1.6.2版本,结果相同。
知道我可能做错了什么吗? (根据示例,我没有使用任何 PowerMock 注释,并且是 运行ning Java 1.7。)我确信这一定是我的一个简单疏忽...
这是文档中示例的 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>
这是测试 class:
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();
}
}
这是个例外:
org.powermock.reflect.exceptions.ConstructorNotFoundException: Failed
to find a constructor with parameter types: [[Ljava.lang.Class;,
java.lang.Integer] at
org.powermock.reflect.internal.WhiteboxImpl.invokeConstructor(WhiteboxImpl.java:1354)
at
org.powermock.reflect.Whitebox.invokeConstructor(Whitebox.java:511)
at Test.test(Test.java:6) ...
有什么想法吗?我确定我缺少的东西非常简单...
这一定是例子中的一个错误。查看 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。我对示例做了一些修改以说明这一点。
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();
}
class:
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
然后当我尝试 运行 PowerMock Bypass Encapsulation docs 的第二个示例时,使用 PowerMock 1.5.2(我们在我的公司使用),我立即得到一个 ConstructorNotFoundException
抛出.我尝试切换到1.6.2版本,结果相同。
知道我可能做错了什么吗? (根据示例,我没有使用任何 PowerMock 注释,并且是 运行ning Java 1.7。)我确信这一定是我的一个简单疏忽...
这是文档中示例的 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>
这是测试 class:
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();
}
}
这是个例外:
org.powermock.reflect.exceptions.ConstructorNotFoundException: Failed to find a constructor with parameter types: [[Ljava.lang.Class;, java.lang.Integer] at org.powermock.reflect.internal.WhiteboxImpl.invokeConstructor(WhiteboxImpl.java:1354) at org.powermock.reflect.Whitebox.invokeConstructor(Whitebox.java:511) at Test.test(Test.java:6) ...
有什么想法吗?我确定我缺少的东西非常简单...
这一定是例子中的一个错误。查看 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。我对示例做了一些修改以说明这一点。
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();
}
class:
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