PowerMockito(使用Mockito)因ExceptionInInitializerError而失败

Question

我们使用Powermockito和Mockito来模拟一些静态类.似乎java.lang.ExceptionInInitializerError每次都会抛出.

你能帮我找出问题所在吗？

正在测试的Java类

package com.myproject.myproduct.search.domain;
import org.elasticsearch.index.query.MultiMatchQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;

public class MyQueryBuilder {

    public MultiMatchQueryBuilder getMultiMatchQueryBuilder() {
        MultiMatchQueryBuilder builder = QueryBuilders.multiMatchQuery("term", "field1");
        builder.field("field1",200.9f);
        return builder;
    }
}

使用Powermock跑步者进行Junit测试

package com.myproject.myproduct.search.domain;

import org.elasticsearch.index.query.MultiMatchQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
@PrepareForTest(QueryBuilders.class)
public class MyQueryBuilderTest {

    private MyQueryBuilder myQueryBuilder;

    @Test
    public void test() {
        PowerMockito.mockStatic(QueryBuilders.class);
        MultiMatchQueryBuilder builder = PowerMockito.mock(MultiMatchQueryBuilder.class);
    }
}

而已.一旦我尝试模拟MultiMatchQueryBuilder,测试代码就无法运行.

这是例外:

位于org.elasticsearch.index.query.AbstractQueryBuilder的org.elasticsearch.common.ParseField.(ParseField.java:35)的org.elasticsearch.common.logging.DeprecationLogger.(DeprecationLogger.java:138)中的java.lang.ExceptionInInitializerError. (AbstractQueryBuilder.java:53)在sun.reflect.GeneratedSerializationConstructorAccessor7.newInstance(未知来源)在java.lang.reflect.Constructor.newInstance(Constructor.java:423)在org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator的.java:40)在org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:59)在org.mockito.internal.creation.jmock.ClassImposterizer.createProxy(ClassImposterizer.java:128)在org.mockito.internal.creation. jmock.ClassImposterizer.imposterise(ClassImposterizer.java:63)atg.powermock.api.mockito.internal.mockcreation.MockCreator.createMethodInvocationControl(MockCreator.java:111)org.powermock.api.mockito.internal.mockcreation.MockCreator.模拟(MockCreator.java:6 0)在org.powermock.api.mockito.PowerMockito.mock(PowerMockito.java:143)的com.spartasystems.stratas.search.domain.MyQueryBuilderTest.testBoostSetProperly(MyQueryBuilderTest.java:22)at sun.reflect.NativeMethodAccessorImpl.invoke0 (本地方法)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498) )在org.junit的org.junit.internal.runners.TestMethod.invoke(TestMethod.java:68)org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl $ PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:310). internal.runners.MethodRoadie $ 2.run(MethodRoadie.java:88)org.junit.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:96)at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl $ PowerMockJUnit44MethodRunner .executeTest(PowerMo ckJUnit44RunnerDelegateImpl.java:294)在org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl $ PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:127)在org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl $ PowerMockJUnit47MethodRunner.executeTest( PowerMockJUnit47RunnerDelegateImpl.java:82)在org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl $ PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)在org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:86) org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49)atg.powermock.modules.junit. .internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)在org.powermock .modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl $ 1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)位于org.junit.runners.ClassRoadie的org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:33).在org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:122)的org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run上运行保护(ClassRoadie.java:45)( JUnit4TestSuiteChunkerImpl.java:104)org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:53)在com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)的org.junit.runner.JUnitCore.run(JUnitCore.java:160)com.intellij.rt.execution.junit.IdeaTestRunner $ Repeater.startRunnerWithArgs (IdeaTestRunner.java:47)在com.intellij.rt.execut com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)中的ion.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)引起:org.elasticsearch.Build的java.lang.NullPointerException. (Build.java:47)......还有41个

处理以退出代码255结束

注意:

可以在此处找到实际底层弹性搜索类的源代码

https://github.com/elastic/elasticsearch/blob/master/core/src/main/java/org/elasticsearch/index/query/QueryBuilders.java

和

https://github.com/elastic/elasticsearch/blob/master/core/src/main/java/org/elasticsearch/index/query/MultiMatchQueryBuilder.java

Answer 1

当用模拟调用时org.elasticsearch.Build#getElasticsearchCodebase

Build.class.getProtectionDomain().getCodeSource().getLocation()

返回，null因为代码没有位置（由 cglib 生成的动态方法。）

因此，在模拟代码期间使用初始化时org.elasticsearch.Build

final URL url = getElasticsearchCodebase(); // url is null
final String urlStr = url.toString(); // null pointer exception.

当然，模拟不会成功并抛出ExceptionInInitializerError异常，这表明在评估静态初始值设定项或静态变量的初始值设定项期间发生了异常。

您可以使用以下代码轻松重现此异常：

@RunWith(PowerMockRunner.class)
@PrepareForTest({QueryBuilders.class})
public class MyQueryBuilderTest {

    @Test
    public void test() {
        final Build current = Build.CURRENT;
    }

}