SpringBoot 项目启动报错 java.lang.ArrayIndexOutOfBoundsException

1. 用户切换

Linux用户切换引起的问题。

webuser@s-b4:~$ 
webuser@s-b4:~$ sudo -i
[sudo] password for webuser: 
root@s-b4:~# su webuser
/home/webuser/.rbenv/bin/rbenv: line 49: cd: /root: Permission denied
webuser@s-b4:/root$ 

刚连接登陆到服务器的时候是webuser用户，使用sudo -i切换到root用户（需要输入密码），接着用su webuser再切回webuser用户，注意看会发现此时的webuser用户和刚进来时候的webuser用户是不一样的，多了个/root。

切换到webuser用户的正确做法是使用exit命令进行用户回退。可以看到从当前的webuser第一次exit会回退到root，再次exit会回退到webuser。此时的webuser才是刚登陆的webuser。

webuser@s-b4:/root$ exit
exit
root@s-b4:~# exit
logout
webuser@s-b4:~$ 

当回到最初的webuser后，如果再次进行exit则会退出登陆状态。

webuser@s-b4:~$ exit
logout
Connection closing...Socket close.

Connection closed by foreign host.

Disconnected from remote host(123.57.42.168) at 19:45:48.

Type `help' to learn how to use Xshell prompt.
[C:\~]$ 

2. 问题描述

SpringBoot项目直接在初始的webuser用户下启动没有问题，使用sudo -i切换到root用户后，再次使用su webuser切换到webuser用户，启动则会报如下异常也会报错，完整异常信息见附录。

Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1
    at org.hibernate.validator.internal.util.Version.getJavaRelease(Version.java:36)
    at org.hibernate.validator.internal.engine.ConfigurationImpl.(ConfigurationImpl.java:119)
    at org.hibernate.validator.internal.engine.ConfigurationImpl.(ConfigurationImpl.java:95)
    at org.hibernate.validator.HibernateValidator.createGenericConfiguration(HibernateValidator.java:31)
    at javax.validation.Validation$GenericBootstrapImpl.configure(Validation.java:296)
    ... 35 common frames omitted

3. 问题原因

直接打开报错的源码org.hibernate.validator.internal.util.Version.getJavaRelease。

    /**
     * 返回当前运行时的Java版本
     *
     * @return Java版本是一个整数（例如Java 8 会返回 8）
     */
    public static int getJavaRelease() {
        // 将返回类似于 1.8
        String[] specificationVersion = System.getProperty( "java.specification.version" ).split( "\\." );

        return Integer.parseInt( specificationVersion[1] );
    }

这里发现会获取系统属性java.specification.version，这个属性是java运行时环境规范版本。写一个测试方法在服务器上不同用户下分别运行一下，看一下各自获取到的Java版本号。

import java.util.Properties;
/**
 * @author wangbo
 * @date 2019/11/18 20:33
 */
public class Test {
    public static void main(String[] args) {
        //获取所有的属性
        Properties properties = System.getProperties();
        //遍历所有的属性
        for (String key : properties.stringPropertyNames()) {
            
            if (key.equalsIgnoreCase("java.specification.version")){
                System.out.println(key + "===>" + properties.getProperty(key));
                return ;
            }
        }
    }
}

编译运行

javac Test.java
java Test

三种用户下分别获取的结果

webuser@s-b4:~$
（1）Test执行结果
java.specification.version===>1.8
（2）java -version结果
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

root@s-b4:~#
（1）Test执行结果
java.specification.version===>1.8
（2）java -version结果
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

webuser@s-b4:/root$
（1）Test执行结果
java.specification.version===>11
（2）java -version结果
openjdk version "11.0.4" 2019-07-16
OpenJDK Runtime Environment (build 11.0.4+11-post-Ubuntu-1ubuntu218.04.3)
OpenJDK 64-Bit Server VM (build 11.0.4+11-post-Ubuntu-1ubuntu218.04.3, mixed mode, sharing)

会发现在第三种用户状态下，获取到的竟然是11，再看源码，必然会报数组越界异常了。
为啥是11？后续再说。

附录

完整异常信息

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'defaultValidator' defined in class path resource [org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.validation.beanvalidation.LocalValidatorFactoryBean]: Factory method 'defaultValidator' threw exception; nested exception is javax.validation.ValidationException: Unable to instantiate Configuration.
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:627)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:456)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1321)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1160)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:847)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204)
    at cn.udesk.kun.Application.main(Application.java:19)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:51)
    at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.validation.beanvalidation.LocalValidatorFactoryBean]: Factory method 'defaultValidator' threw exception; nested exception is javax.validation.ValidationException: Unable to instantiate Configuration.
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622)
    ... 27 common frames omitted
Caused by: javax.validation.ValidationException: Unable to instantiate Configuration.
    at javax.validation.Validation$GenericBootstrapImpl.configure(Validation.java:299)
    at org.springframework.boot.validation.MessageInterpolatorFactory.getObject(MessageInterpolatorFactory.java:53)
    at org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration.defaultValidator(ValidationAutoConfiguration.java:57)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    ... 28 common frames omitted
Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1
    at org.hibernate.validator.internal.util.Version.getJavaRelease(Version.java:36)
    at org.hibernate.validator.internal.engine.ConfigurationImpl.(ConfigurationImpl.java:119)
    at org.hibernate.validator.internal.engine.ConfigurationImpl.(ConfigurationImpl.java:95)
    at org.hibernate.validator.HibernateValidator.createGenericConfiguration(HibernateValidator.java:31)
    at javax.validation.Validation$GenericBootstrapImpl.configure(Validation.java:296)
    ... 35 common frames omitted