java - 静态内部类上的ClassNotFoundException

我通过使用ClassNotFoundException传递一个Class.forName()来传递驻留在同一包中的公共静态类的完全限定名称。这是在运行测试时。

这是完整的堆栈跟踪：

java.lang.AssertionError
    at org.junit.Assert.fail(Assert.java:86)
    at org.junit.Assert.assertTrue(Assert.java:41)
    at org.junit.Assert.assertNotNull(Assert.java:712)
    at org.junit.Assert.assertNotNull(Assert.java:722)
    at com.badlogic.ashley.serialization.EntitySerializerTests.read(EntitySerializerTests.java:63)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runners.Suite.runChild(Suite.java:128)
    at org.junit.runners.Suite.runChild(Suite.java:27)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

在我的EntitySerializerTests.java文件夹内的tests中。

package com.badlogic.ashley.serialization;
public class EntitySerializerTests {

    public static class TestComponentA implements Component {
        public int value;
    }

    ...
}

在我的图书馆代码中

package com.badlogic.ashley.serialization;
public class EntitySerializer implements Json.Serializer<Entity> {
    ...

    private Component read(Json json, JsonValue componentValue) throws ClassNotFoundException {
        String className = componentValue.name();
        Class componentType = Class.forName(className); // THROWS
        ...
    }
}

异常消息是：

java.lang.ClassNotFoundException: com.badlogic.ashley.serialization.EntitySerializerTests.TestComponentA

库代码正在尝试获取在测试文件中定义的类的名称的Class。可以吗我假设在运行时，所有这些类在类路径中都可用。

谢谢。

最佳答案

问题在于反射的类名不是com.badlogic.ashley.serialization.EntitySerializerTests.TestComponentA，而是com.badlogic.ashley.serialization.EntitySerializerTests$TestComponentA（将内部类与封闭类分开的是$而不是.）。

如果查看已编译类的文件名或使用EntitySerializerTests.TestComponentA.class.getName()，也可以进行检查。