一个离奇的ArrayIndexOutOfBoundsException异常的排查过程

先按时序复盘一下
造成异常的工具类
分析
结果确认
反思

今天同事遇到了一个离奇的ArrayIndexOutOfBoundsException，找我协助定位，定位的过程很有意思，故而记录一下。

先按时序复盘一下

项目原先可正常运行。

没有修改任何依赖的情况下，从另一个项目移植了工具类BeanValidationUtil 后，报如下异常：

org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:307) | Context initialization failed
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to readcandidate component class: file [/Users/xxxxxxxxx/BeanValidationUtil.class];nested exception is java.lang.ArrayIndexOutOfBoundsException: 48959
   atorg.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:260)
   atorg.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:242)
   atorg.springframework.context.annotation.ComponentScanBeanDefinitionParser.parse(ComponentScanBeanDefinitionParser.java:84)
   atorg.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
   atorg.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1419)
   atorg.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1409)
   atorg.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:184)
   atorg.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
   atorg.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
   atorg.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
   atorg.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
   atorg.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
   atorg.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
   atorg.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)
   atorg.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)
   atorg.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
   atorg.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125)
   atorg.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)
   atorg.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:131)
   atorg.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:522)
   atorg.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:436)
   atorg.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:384)
   atorg.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:283)
   atorg.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)
   atorg.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5135)
   atorg.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5658)
   at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
   atorg.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1015)
   at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:991)
   at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
   at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:2015)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   atorg.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
   atcom.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
   atcom.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
   atorg.apache.catalina.mbeans.MBeanFactory.createContext(MBeanFactory.java:789)
   atorg.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:573)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   atorg.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
   atcom.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
   atcom.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
   atjavax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
   atjavax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
   atjavax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
   atjavax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
   atjavax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)
   at sun.rmi.transport.Transport$1.run(Transport.java:200)
   at sun.rmi.transport.Transport$1.run(Transport.java:197)
   at java.security.AccessController.doPrivileged(Native Method)
   at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
   atsun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
   atsun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
   atsun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
   at java.security.AccessController.doPrivileged(Native Method)
   atsun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
   atjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
   atjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 48959
   at org.springframework.asm.ClassReader.readUnsignedShort(UnknownSource)
   at org.springframework.asm.ClassReader.accept(Unknown Source)
   at org.springframework.asm.ClassReader.accept(Unknown Source)
   at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:54)
   atorg.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:80)
   atorg.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:101)
   atorg.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:236)
   ... 68 more

造成异常的工具类

/**
* JSR349 Bean Validation工具类
*
* @author limu.zl
*/
public class BeanValidationUtil {
   /**
    * 验证失败时抛出ConstraintViolationException
    *
    * @param object 待验证对象
    * @param groups 验证group
    */
   public static void validateWithException(Object object, Class<?>... groups) {
       ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();

       // 国际化，强制用中文，ref：https://docs.oracle.com/javase/tutorial/i18n/locale/create.html
       Locale locale = new Locale.Builder().setLanguage("zh").setRegion("CN").build();

       // 国际化，指定语言，ref：https://www.ibm.com/developerworks/cn/java/j-cn-hibernate-validator/index.html
       MessageInterpolator interpolator = newLocalizedMessageInterpolator(validatorFactory.getMessageInterpolator(), locale);

       Validator classValidator = validatorFactory.usingContext()
               .messageInterpolator(interpolator)
               .getValidator();

       Set<ConstraintViolation<Object>> constraintViolations =classValidator.validate(object, groups);
       if (!constraintViolations.isEmpty()) {
           String messages = constraintViolations.stream()
                   .filter(t -> t instanceof ConstraintViolationImpl)
                   .map(t -> {
                       ConstraintViolationImpl t1 = (ConstraintViolationImpl) t;
                       return String.format("出问题的字段：%s，问题：%s",t1.getPropertyPath(), t1.getMessage());
                   })
                   .collect(Collectors.toList())
                   .toString();
           throw new IllegalArgumentException(messages);
       }
   }
}

分析

如代码所示，BeanValidationUtil 是个工具类，根本不在Spring容器上下文里，但异常栈却报到Spring的包里去了。

由于项目没有修改依赖，所以包冲突问题不太可能出现（这个项目原先也使用JSR349做Bean Validation），而且冲突的话异常应该是NoClassDefFoundError之类的异常。
尝试降低Hibernate Validation的版本到4.x，故障依旧。
百度、谷歌类似异常，无果。

经过20分钟的源码定位也没找到问题所在，于是我尝试逐步删除BeanValidationUtil的代码。发现当把lambda语法删光之后，项目就能正常启动了。

突然灵光一现，问同事： “这TM是不是个非常古老的项目啊？”

同事：“对啊，四五年了吧……”

于是分析了下pom.xml，发现用的是Spring 3 。隐约记得Spring 3不完全兼容JDK8，这个类中使用了Java 8的语法，所以导致了问题。

结果确认

既然猜测是Spring 3和Java 8不兼容导致，故而在搜索时，将关键词改为：spring 3 java 8 ArrayIndexOutOfBoundsException ，果然印证了自己的想法。

反思

犯了经验主义错误，基于Spring 3的项目已经三四年没有见过了（Dubbo不算，哈哈哈。因为Dubbo当初的版本虽然依赖了Spring 3，但其实实际项目一般都会exclude掉，换上Spring 4），一直以为是个Spring 4的项目，没有从Spring版本与JDK的兼容性的方向上去考虑。

浪费了半小时。

先按时序复盘一下

造成异常的工具类

分析

结果确认

反思

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