java – Double Brace初始化类型混乱

我目前正在使用Java EE 6在我的项目中为类似Facade的结构编写单元测试.
对于测试,我使用Junit 4.11,Eclipse Kepler作为IDE.

从我所看到的情况来看,双支撑初始化似乎有些“错误”,但我不知道如何能够解释为什么它不起作用,因为我认为应该这样做.

为了达到目的,我使用以下Class在集中的位置进行转换：

package com.example-company.util.converters;

import java.util.HashMap;
import java.util.Map;

import com.example-company.model.Location;
import com.example-company.model.Right;

public final class ModelConverters {

    private static final Map<Class<?>,ModelConverter<?,String>> modelConverterBacking = new HashMap<Class<?>,String>>();
    static {
        modelConverterBacking.put(Right.class,new RightConverter());
        modelConverterBacking.put(Location.class,new LocationConverter());
    };

    public static <T> String convert(final T input)
            throws IllegalStateException {
        @SuppressWarnings("unchecked")
        ModelConverter<T,String> modelConverter = (ModelConverter<T,String>) modelConverterBacking
                .get(input.getClass());
        if (modelConverter == null) {
            throw new IllegalStateException("No mapping found for "
                    + input.getClass());
        }
        return modelConverter.convertToView(input);
    }
}

就此而言,它主要是使用泛型和静态地图.现在我决定为此写一些单元测试.下面的类略有缩短,所有不能重现问题的测试用例都被删除了.

package com.example-company.test.unit.util.converters;

import static org.junit.Assert.assertEquals;
import com.example-company.model.Location;
import com.example-company.util.converters.ModelConverters;

import org.junit.Test;

public class ModelConvertersFacadeTests {

    @Test
    public void test_MappingForLocationExists() {
        final Location stub = new Location() {
            {
                setLocationName("");
            }
        };

        String actual = ModelConverters.convert(stub);
        assertEquals("",actual);
    }
}

到目前为止一切都很好,没有什么应该真的发生,至少不是我现在得到的.那就是：带有以下stacktrace的花哨的IllegalStateException：

java.lang.IllegalStateException: No mapping found for class com.example-company.test.unit.util.converters.ModelConvertersFacadeTests$1
    at com.example-company.util.converters.ModelConverters.convert(ModelConverters.java:23)
    at com.example-company.test.unit.util.converters.ModelConvertersFacadeTests.test_MappingForLocationExists(ModelConvertersFacadeTests.java:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

我做的第一件事就是再次运行它,然后设置一个断点来检查ModelConverters里面发生了什么#convert()

我有点松了一口气：

看来input.getClass()返回ModelConvertersFacadeTests.但为什么它不返回com.example-company.model.Location？