springboot遇到的bug们

最新推荐文章于 2022-10-24 18:02:08 发布

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最新推荐文章于 2022-10-24 18:02:08 发布

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分类专栏： springboot和springcloud

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本文主要介绍了在使用SpringBoot过程中遇到的一些常见问题及解决方法，包括非Web项目启动报错（需添加Tomcat包）和作为Dubbo消费者引入ZK与Dubbo时遇到的依赖冲突问题（需移除javassist包）。通过简单的步骤和调整，可以有效解决这些问题。

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写到前面：

遇到bug第一步，先mvn -clean

第二步，看console的bug提示（根据提示看是不是包的问题）

因为如果是语法问题的话idea会提示出来，编译就编译不过去，别说启动了。

1、非web项目启动报错

2019-06-19 10:29:47.999 [main] INFO  o.s.b.c.e.AnnotationConfigEmbeddedWebApplicationContext - Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@3d2ee678: startup date [Wed Jun 19 10:29:47 CST 2019]; root of context hierarchy
2019-06-19 10:29:47.999 [main] WARN  o.s.b.c.e.AnnotationConfigEmbeddedWebApplicationContext - Exception thrown from LifecycleProcessor on context close
java.lang.IllegalStateException: LifecycleProcessor not initialized - call 'refresh' before invoking lifecycle methods via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@3d2ee678: startup date [Wed Jun 19 10:29:47 CST 2019]; root of context hierarchy
	at org.springframework.context.support.AbstractApplicationContext.getLifecycleProcessor(AbstractApplicationContext.java:427)
	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:999)
2019-06-19 10:29:47.999 [main] ERROR o.s.b.factory.support.DefaultListableBeanFactory - Destroy method on bean with name 'org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory' threw an exception
java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@3d2ee678: startup date [Wed Jun 19 10:29:47 CST 2019]; root of context hierarchy
	at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:414)
	at org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97)
	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253)

因为我的项目不是web项目，没有加web包

所以单独加上tomcat包就好了

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
</dependency>

2、作为一个消费方，引入zk和dubbo的问题

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageService': Instantiation of bean failed; nested exception is java.lang.ExceptionInInitializerError
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1238)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1137)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getSingletonFactoryBeanForTypeCheck(AbstractAutowireCapableBeanFactory.java:952)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryBean(AbstractAutowireCapableBeanFactory.java:835)
	at org.springframework.beans.factory.support.AbstractBeanFactory.isTypeMatch(AbstractBeanFactory.java:562)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:427)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:390)
	at org.springframework.beans.factory.BeanFactoryUtils.beanNamesForTypeIncludingAncestors(BeanFactoryUtils.java:208)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1276)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065)
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:818)
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:724)
	... 19 common frames omitted
Caused by: java.lang.ExceptionInInitializerError: null
	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.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:170)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1230)
	... 31 common frames omitted
Caused by: java.lang.IllegalStateException: fail to create adaptive instance: java.lang.IllegalStateException: Can not create adaptive extenstion interface com.alibaba.dubbo.rpc.Protocol, cause: Failed to load extension class(interface: interface com.alibaba.dubbo.common.compiler.Compiler, class line: com.alibaba.dubbo.common.compiler.support.JavassistCompiler) in jar:file:/D:/worksoft/apache-maven-3.3.9-bin/repository/com/alibaba/dubbo/2.5.0/dubbo-2.5.0.jar!/META-INF/dubbo/internal/com.alibaba.dubbo.common.compiler.Compiler, cause: javassist/ClassPath
	at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtension(ExtensionLoader.java:431)
	at com.alibaba.dubbo.config.ReferenceConfig.<clinit>(ReferenceConfig.java:63)
	... 38 common frames omitted
Caused by: java.lang.IllegalStateException: Can not create adaptive extenstion interface com.alibaba.dubbo.rpc.Protocol, cause: Failed to load extension class(interface: interface com.alibaba.dubbo.common.compiler.Compiler, class line: com.alibaba.dubbo.common.compiler.support.JavassistCompiler) in jar:file:/D:/worksoft/apache-maven-3.3.9-bin/repository/com/alibaba/dubbo/2.5.0/dubbo-2.5.0.jar!/META-INF/dubbo/internal/com.alibaba.dubbo.common.compiler.Compiler, cause: javassist/ClassPath
	at com.alibaba.dubbo.common.extension.ExtensionLoader.createAdaptiveExtension(ExtensionLoader.java:695)
	at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtension(ExtensionLoader.java:427)
	... 39 common frames omitted
Caused by: java.lang.IllegalStateException: Failed to load extension class(interface: interface com.alibaba.dubbo.common.compiler.Compiler, class line: com.alibaba.dubbo.common.compiler.support.JavassistCompiler) in jar:file:/D:/worksoft/apache-maven-3.3.9-bin/repository/com/alibaba/dubbo/2.5.0/dubbo-2.5.0.jar!/META-INF/dubbo/internal/com.alibaba.dubbo.common.compiler.Compiler, cause: javassist/ClassPath
	at com.alibaba.dubbo.common.extension.ExtensionLoader.loadFile(ExtensionLoader.java:657)
	at com.alibaba.dubbo.common.extension.ExtensionLoader.loadExtensionClasses(ExtensionLoader.java:563)
	at com.alibaba.dubbo.common.extension.ExtensionLoader.getExtensionClasses(ExtensionLoader.java:539)
	at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtensionClass(ExtensionLoader.java:700)
	at com.alibaba.dubbo.common.extension.ExtensionLoader.createAdaptiveExtension(ExtensionLoader.java:693)
	at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtension(ExtensionLoader.java:427)
	at com.alibaba.dubbo.common.extension.ExtensionLoader.createAdaptiveExtensionClass(ExtensionLoader.java:710)
	at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtensionClass(ExtensionLoader.java:704)
	at com.alibaba.dubbo.common.extension.ExtensionLoader.createAdaptiveExtension(ExtensionLoader.java:693)
	... 40 common frames omitted
Caused by: java.lang.NoClassDefFoundError: javassist/ClassPath
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at com.alibaba.dubbo.common.extension.ExtensionLoader.loadFile(ExtensionLoader.java:599)
	... 48 common frames omitted
Caused by: java.lang.ClassNotFoundException: javassist.ClassPath
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 51 common frames omitted

<!-- dubbo依赖jar -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>dubbo</artifactId>
    <version>2.5.0</version>
    <exclusions>
        <exclusion>
            <artifactId>spring</artifactId>
            <groupId>org.springframework</groupId>
        </exclusion>
        <!--<exclusion>
            <artifactId>javassist</artifactId>
            <groupId>org.javassist</groupId>
        </exclusion>-->
    </exclusions>
</dependency>

在引入包的时候去掉javassist。

只是站在使用者的角度，没有深入分析