我按照Grails 3.2 documentation中的说明从休眠5(默认设置)切换到了休眠4。但是，现在我的应用程序无法启动。我在启动时看到以下异常。
01/12/2017 11:52:55 PST ERROR main SpringApplication:839 - Application startup failed
java.lang.NullPointerException: null
at java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1337)
at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1197)
at java.beans.Introspector.getBeanInfo(Introspector.java:426)
at java.beans.Introspector.getBeanInfo(Introspector.java:173)
at java.beans.Introspector.getBeanInfo(Introspector.java:260)
at java.beans.Introspector.<init>(Introspector.java:407)
at java.beans.Introspector.getBeanInfo(Introspector.java:173)
at groovy.lang.MetaClassImpl$15.run(MetaClassImpl.java:3290)
at java.security.AccessController.doPrivileged(Native Method)
at groovy.lang.MetaClassImpl.addProperties(MetaClassImpl.java:3288)
at groovy.lang.MetaClassImpl.initialize(MetaClassImpl.java:3265)
at org.codehaus.groovy.reflection.ClassInfo.getMetaClassUnderLock(ClassInfo.java:254)
at org.codehaus.groovy.reflection.ClassInfo.getMetaClass(ClassInfo.java:285)
at org.codehaus.groovy.runtime.callsite.ClassMetaClassGetPropertySite.<init>(ClassMetaClassGetPropertySite.java:38)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.createClassMetaClassGetPropertySite(AbstractCallSite.java:373)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.createGetPropertySite(AbstractCallSite.java:325)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.acceptGetProperty(AbstractCallSite.java:312)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGetProperty(AbstractCallSite.java:296)
at org.grails.plugins.databasemigration.DatabaseMigrationGrailsPlugin.configureLiquibase(DatabaseMigrationGrailsPlugin.groovy:96)
at org.grails.plugins.databasemigration.DatabaseMigrationGrailsPlugin.doWithSpring(DatabaseMigrationGrailsPlugin.groovy:55)
at org.grails.plugins.DefaultGrailsPlugin.doWithRuntimeConfiguration(DefaultGrailsPlugin.java:555)
at org.grails.plugins.AbstractGrailsPluginManager.doRuntimeConfiguration(AbstractGrailsPluginManager.java:167)
at grails.boot.config.GrailsApplicationPostProcessor.postProcessBeanDefinitionRegistry(GrailsApplicationPostProcessor.groovy:171)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:118)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:686)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:524)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
快速搜索似乎暗示此错误是由项目依赖项中的某些不匹配引起的。但是，Grails 3.2文档仅提到添加了休眠4依赖关系，而没有更改其他任何依赖关系。有谁知道这里发生了什么以及如何解决？
请您参考如下方法:
第一次刷新依赖项使用-
grails clean --refresh-dependencies
使用此命令生成依赖性报告-
grails dependency-report
确认应用程序正在使用hibernate 4依赖项。从其任何插件中找出是否正在使用hibernate 5依赖项。如果是这样，请从相应插件中将其排除在build.gradle文件中。
