Spring Boot Project Error in Eclipse TestNG:
java.lang.NoSuchMethodError: org.yaml.snakeyaml.Yaml.
15:59:52.645 [main] ERROR org.springframework.test.context.TestContextManager - Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTestExecutionListener@69b794e2] to prepare test instance [com.xxx.rds.frtool.service.RdsReportsServiceTests@4c40b76e]
java.lang.NoSuchMethodError: org.yaml.snakeyaml.Yaml.(Lorg/yaml/snakeyaml/constructor/BaseConstructor;Lorg/yaml/snakeyaml/representer/Representer;Lorg/yaml/snakeyaml/DumperOptions;Lorg/yaml/snakeyaml/resolver/Resolver;)V
at org.springframework.boot.env.YamlPropertySourceLoader$Processor.createYaml(YamlPropertySourceLoader.java:86)
at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:136)
at org.springframework.boot.env.YamlPropertySourceLoader$Processor.process(YamlPropertySourceLoader.java:101)
at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:58)
at com.xxx.base.service.util.YamlApplicationContextInitializer.initialize(YamlApplicationContextInitializer.java:27)
at org.springframework.test.context.support.AbstractContextLoader.invokeApplicationContextInitializers(AbstractContextLoader.java:170)
at org.springframework.test.context.support.AbstractContextLoader.prepareContext(AbstractContextLoader.java:138)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:122)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:108)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:251)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:117)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
at org.springframework.test.context.testng.AbstractTestNGSpringContextTests.springTestContextPrepareTestInstance(AbstractTestNGSpringContextTests.java:149)
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:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138)
at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:175)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:107)
at org.testng.TestRunner.privateRun(TestRunner.java:767)
at org.testng.TestRunner.run(TestRunner.java:617)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:335)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:330)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
at org.testng.SuiteRunner.run(SuiteRunner.java:240)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
at org.testng.TestNG.run(TestNG.java:1057)
at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
15:59:52.660 [main] DEBUG org.springframework.test.context.support.AbstractDirtiesContextTestExecutionListener - After test method: context [DefaultTestContext@1460a8c0 testClass = RdsReportsServiceTests, testInstance = com.xxx.rds.frtool.service.RdsReportsServiceTests@4c40b76e, testMethod = testFindReport@RdsReportsServiceTests, testException = [null], mergedContextConfiguration = [MergedContextConfiguration@4f638935 testClass = RdsReportsServiceTests, locations = '{}', classes = '{class com.xxx.rds.frtool.service.BaseTest$TestConfiguration}', contextInitializerClasses = '[class com.xxx.base.service.util.YamlApplicationContextInitializer]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{}', contextCustomizers = set[org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@77a57272, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@6e2c9341, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@10b48321], contextLoader = 'org.springframework.test.context.support.DelegatingSmartContextLoader', parent = [null]]], class annotated with @DirtiesContext [false] with mode [null], method annotated with @DirtiesContext [false] with mode [null].
15:59:52.661 [main] DEBUG org.springframework.test.context.support.AbstractDirtiesContextTestExecutionListener - After test class: context [DefaultTestContext@1460a8c0 testClass = RdsReportsServiceTests, testInstance = [null], testMethod = [null], testException = [null], mergedContextConfiguration = [MergedContextConfiguration@4f638935 testClass = RdsReportsServiceTests, locations = '{}', classes = '{class com.xxx.rds.frtool.service.BaseTest$TestConfiguration}', contextInitializerClasses = '[class com.xxx.base.service.util.YamlApplicationContextInitializer]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{}', contextCustomizers = set[org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@77a57272, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@6e2c9341, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@10b48321], contextLoader = 'org.springframework.test.context.support.DelegatingSmartContextLoader', parent = [null]]], class annotated with @DirtiesContext [false] with mode [null].
FAILED CONFIGURATION: @BeforeClass springTestContextPrepareTestInstance
java.lang.NoSuchMethodError: org.yaml.snakeyaml.Yaml.(Lorg/yaml/snakeyaml/constructor/BaseConstructor;Lorg/yaml/snakeyaml/representer/Representer;Lorg/yaml/snakeyaml/DumperOptions;Lorg/yaml/snakeyaml/resolver/Resolver;)V
at org.springframework.boot.env.YamlPropertySourceLoader$Processor.createYaml(YamlPropertySourceLoader.java:86)
at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:136)
at org.springframework.boot.env.YamlPropertySourceLoader$Processor.process(YamlPropertySourceLoader.java:101)
at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:58)
at com.xxx.base.service.util.YamlApplicationContextInitializer.initialize(YamlApplicationContextInitializer.java:27)
at org.springframework.test.context.support.AbstractContextLoader.invokeApplicationContextInitializers(AbstractContextLoader.java:170)
at org.springframework.test.context.support.AbstractContextLoader.prepareContext(AbstractContextLoader.java:138)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:122)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:108)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:251)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:117)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
at org.springframework.test.context.testng.AbstractTestNGSpringContextTests.springTestContextPrepareTestInstance(AbstractTestNGSpringContextTests.java:149)
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:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138)
at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:175)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:107)
at org.testng.TestRunner.privateRun(TestRunner.java:767)
at org.testng.TestRunner.run(TestRunner.java:617)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:335)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:330)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
at org.testng.SuiteRunner.run(SuiteRunner.java:240)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
at org.testng.TestNG.run(TestNG.java:1057)
at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
SKIPPED CONFIGURATION: @BeforeMethod springTestContextBeforeTestMethod
SKIPPED: testFindReport
===============================================
Default test
Tests run: 1, Failures: 0, Skips: 1
Configuration Failures: 1, Skips: 1
===============================================
===============================================
Default suite
Total tests run: 1, Failures: 0, Skips: 1
Configuration Failures: 1, Skips: 1
===============================================
[TestNG] Time taken by org.testng.reporters.SuiteHTMLReporter@96532d6: 71 ms
[TestNG] Time taken by org.testng.reporters.jq.Main@6442b0a6: 20 ms
[TestNG] Time taken by org.testng.reporters.XMLReporter@3498ed: 5 ms
[TestNG] Time taken by [FailedReporter passed=0 failed=0 skipped=0]: 9 ms
[TestNG] Time taken by org.testng.reporters.JUnitReportReporter@6b2fad11: 6 ms
[TestNG] Time taken by org.testng.reporters.EmailableReporter2@3cda1055: 5 ms
1, 在网上查了一下，说是yaml包冲突，于是试了以下配置，但没有解决，即使是升级了testng版本。
org.testng
testng
6.8.21
test
snakeyaml
org.yaml
2，查看了Meven的依赖情况，也没有发现问题。
3， 试着升级了yaml包的版本，但还是没有效果。
snakeyaml
org.yaml
1.18
test
4， 正在对问题感到奇怪的时候，突然想到了Eclipse TestNG插件。因为可以肯定是环境的问题。
原来的TestNG插件版本是testng6.8.6。现在更新到6.14版本，重新启动Eclipse和运行测试用例，问题消失！！！