Springboot unit test depends on pit example source code analysis

springboot单元测试依赖踩坑

在进行springboot 单元测试的时候，发现如下错误。

java.lang.IllegalStateException: Could not load CacheAwareContextLoaderDelegate [class org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate]

    at org.springframework.test.context.BootstrapUtils.createCacheAwareContextLoaderDelegate(BootstrapUtils.java:103)
    at org.springframework.test.context.BootstrapUtils.createBootstrapContext(BootstrapUtils.java:72)
    at org.springframework.test.context.TestContextManager.(TestContextManager.java:124)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTestContextManager(SpringJUnit4ClassRunner.java:151)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.(SpringJUnit4ClassRunner.java:142)
    at org.springframework.test.context.junit4.SpringRunner.(SpringRunner.java:49)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:104)
    at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33)
    at org.junit.internal.requests.FilterRequest.getRunner(FilterRequest.java:36)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:49)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate]: Unresolvable class definition; nested exception is java.lang.NoSuchMethodError: org.springframework.core.KotlinDetector.isKotlinReflectPresent()Z
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:132)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:152)
    at org.springframework.test.context.BootstrapUtils.createCacheAwareContextLoaderDelegate(BootstrapUtils.java:100)
    ... 20 more
Caused by: java.lang.NoSuchMethodError: org.springframework.core.KotlinDetector.isKotlinReflectPresent()Z
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:171)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:122)
    ... 22 more

一天以前单测是能跑的，初步预计是依赖的问题。由于项目采用了多模块结构，模块间的引用较多，因此需要逐一检查每个模块是否存在问题。

如下步骤

• 1. 在出现问题的单测归属模块的pom文件中，找到所有模块间依赖

• 2. 依次到各个模块进行单元测试，定位问题模块

• 3. 排查问题模块的依赖问题

一番折腾，发现问题模块 carrier-api

再往下深入，检查carrier-api依赖

幸运的是，问题的根源迅速被发现，是由于spring-web的引用导致的错误。将该引用注释掉，并且将相关代码进行引用替换。

problem solved

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