1.报错显示：

13:43:13.869 [restartedMain] DEBUG org.springframework.boot.diagnostics.FailureAnalyzers - FailureAnalyzer org.springframework.boot.diagnostics.analyzer.ValidationExceptionFailureAnalyzer@2dc3b821 failed
java.lang.NoClassDefFoundError: javax/validation/ValidationException
	at org.springframework.boot.diagnostics.analyzer.ValidationExceptionFailureAnalyzer.analyze(ValidationExceptionFailureAnalyzer.java:31)
	at org.springframework.boot.diagnostics.AbstractFailureAnalyzer.analyze(AbstractFailureAnalyzer.java:35)
	at org.springframework.boot.diagnostics.FailureAnalyzers.analyze(FailureAnalyzers.java:118)
	at org.springframework.boot.diagnostics.FailureAnalyzers.reportException(FailureAnalyzers.java:111)
	at org.springframework.boot.SpringApplication.reportFailure(SpringApplication.java:846)
	at org.springframework.boot.SpringApplication.handleRunFailure(SpringApplication.java:821)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:336)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298)
	at com.xu.admin.Boot05WebAdminApplication.main(Boot05WebAdminApplication.java:27)
	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.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: java.lang.ClassNotFoundException: javax.validation.ValidationException
	at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	... 15 common frames omitted
13:43:13.877 [restartedMain] DEBUG org.springframework.boot.diagnostics.FailureAnalyzers - FailureAnalyzer org.springframework.boot.liquibase.LiquibaseChangelogMissingFailureAnalyzer@7646882b failed
java.lang.NoClassDefFoundError: liquibase/exception/ChangeLogParseException
	at org.springframework.boot.liquibase.LiquibaseChangelogMissingFailureAnalyzer.analyze(LiquibaseChangelogMissingFailureAnalyzer.java:33)
	at org.springframework.boot.diagnostics.AbstractFailureAnalyzer.analyze(AbstractFailureAnalyzer.java:35)
	at org.springframework.boot.diagnostics.FailureAnalyzers.analyze(FailureAnalyzers.java:118)
	at org.springframework.boot.diagnostics.FailureAnalyzers.reportException(FailureAnalyzers.java:111)
	at org.springframework.boot.SpringApplication.reportFailure(SpringApplication.java:846)
	at org.springframework.boot.SpringApplication.handleRunFailure(SpringApplication.java:821)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:336)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298)
	at com.xu.admin.Boot05WebAdminApplication.main(Boot05WebAdminApplication.java:27)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: java.lang.ClassNotFoundException: liquibase.exception.ChangeLogParseException
	at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	... 15 common frames omitted
13:43:13.888 [restartedMain] ERROR org.springframework.boot.SpringApplication - Application run failed
org.yaml.snakeyaml.scanner.ScannerException: mapping values are not allowed here
 in 'reader', line 56, column 17:
            instance:
                    ^

2.错误原因：

3.解决：

将其配置文件格式书写正确即可

原文地址：http://www.cnblogs.com/rong-xu-drum/p/16844024.html

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