SpringBoot项目中遇到的异常-白红宇

问题：

SpringBoot项目中集成了阿里开源Druid数据源，本地开发环境直接启动SpringBoot应用(SpringApplication.run方法)，启动成功，由于正式应用是部署在服务器已有的Tomcat环境中，经过改造将SpringBoot项目打成ROOT.war包后，部署到服务器上，启动应用程序时，报错了，错误信息如下所示：

15:13:34.616 repair [localhost-startStop-1] DEBUG o.springframework.jndi.JndiTemplate - Looking up JNDI object with name [java:comp/env/logging.level]15:13:34.607 repair [localhost-startStop-1] DEBUG o.s.jndi.JndiPropertySource - JNDI lookup for name [logging.group] threw NamingException with message: Name [logging.group] is not bound in this Context. Unable to find [logging.group].. Returning null.15:13:34.606 repair [localhost-startStop-1] DEBUG o.springframework.jndi.JndiTemplate - Looking up JNDI object with name [logging.group]15:13:34.606 repair [localhost-startStop-1] DEBUG o.s.jndi.JndiLocatorDelegate - Converted JNDI name [java:comp/env/logging.group] not found - trying original name [logging.group]. javax.naming.NameNotFoundException: Name [logging.group] is not bound in this Context. Unable to find [logging.group].15:13:34.580 repair [background-preinit] DEBUG o.h.v.m.ResourceBundleMessageInterpolator - Loaded expression factory via original TCCL15:13:34.599 repair [localhost-startStop-1] DEBUG o.springframework.jndi.JndiTemplate - Looking up JNDI object with name [java:comp/env/logging.group]15:13:34.578 repair [localhost-startStop-1] DEBUG o.s.jndi.JndiPropertySource - JNDI lookup for name [logging.group] threw NamingException with message: Name [logging.group] is not bound in this Context. Unable to find [logging.group].. Returning null.15:13:34.577 repair [localhost-startStop-1] DEBUG o.springframework.jndi.JndiTemplate - Looking up JNDI object with name [logging.group]15:13:34.577 repair [localhost-startStop-1] DEBUG o.s.jndi.JndiLocatorDelegate - Converted JNDI name [java:comp/env/logging.group] not found - trying original name [logging.group]. javax.naming.NameNotFoundException: Name [logging.group] is not bound in this Context. Unable to find [logging.group].15:13:34.548 repair [localhost-startStop-1] DEBUG o.springframework.jndi.JndiTemplate - Looking up JNDI object with name [java:comp/env/logging.group]	... 74 common frames omitted	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136)	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:307)	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363)	at java.lang.reflect.Method.invoke(Method.java:497)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at cn.demo.repair.service.impl.VpServiceImpl.init(VpServiceImpl.java:42)	at java.util.Properties.load(Properties.java:341)	at java.util.Properties.load0(Properties.java:353)	at java.util.Properties$LineReader.readLine(Properties.java:434)Caused by: java.lang.NullPointerException: null	... 61 common frames omitted	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1166)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1239)	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:273)	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)	at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$120/684584821.getObject(Unknown Source)	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1737)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:419)	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:139)Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'VpServiceImpl': Invocation of init method failed; nested exception is java.lang.NullPointerException	... 47 common frames omitted	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1166)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1239)	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:273)	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)	at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$120/684584821.getObject(Unknown Source)	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1378)	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalServiceImpl': Unsatisfied dependency expressed through field 'vpService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'VpServiceImpl': Invocation of init method failed; nested exception is java.lang.NullPointerException	... 33 common frames omitted	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1166)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1239)	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:273)	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)	at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$120/684584821.getObject(Unknown Source)	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1378)	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'repairServiceImpl': Unsatisfied dependency expressed through field 'approvalService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalServiceImpl': Unsatisfied dependency expressed through field 'vpService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'VpServiceImpl': Invocation of init method failed; nested exception is java.lang.NullPointerException	at java.lang.Thread.run(Thread.java:745)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1823)	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:952)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:700)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:724)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5178)	at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:171)	at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:91)	at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:137)	at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:157)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846)	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)	at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$120/684584821.getObject(Unknown Source)	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1378)	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'repairController': Unsatisfied dependency expressed through field 'repairService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'repairServiceImpl': Unsatisfied dependency expressed through field 'approvalService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalServiceImpl': Unsatisfied dependency expressed through field 'vpService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'VpServiceImpl': Invocation of init method failed; nested exception is java.lang.NullPointerException15:07:53.610 repair [localhost-startStop-1] ERROR o.s.boot.SpringApplication - Application run failedError starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.15:07:53.586 repair [localhost-startStop-1] INFO  o.s.b.a.l.ConditionEvaluationReportLoggingListener - 15:07:53.536 repair [localhost-startStop-1] INFO  c.alibaba.druid.pool.DruidDataSource - {dataSource-1} closed15:07:53.258 repair [localhost-startStop-1] WARN  o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'repairController': Unsatisfied dependency expressed through field 'repairService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'repairServiceImpl': Unsatisfied dependency expressed through field 'approvalService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalServiceImpl': Unsatisfied dependency expressed through field 'vpService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'VpServiceImpl': Invocation of init method failed; nested exception is java.lang.NullPointerException15:07:37.645 repair [localhost-startStop-1] INFO  c.alibaba.druid.pool.DruidDataSource - {dataSource-1} inited15:07:28.073 repair [localhost-startStop-1] INFO  c.a.d.s.b.a.DruidDataSourceAutoConfigure - Init DruidDataSource15:07:25.620 repair [localhost-startStop-1] INFO  o.s.b.w.s.FilterRegistrationBean - Mapping filter: 'webStatFilter' to urls: [/*]15:07:25.619 repair [localhost-startStop-1] INFO  o.s.b.w.s.FilterRegistrationBean - Mapping filter: 'requestContextFilter' to: [/*]15:07:25.619 repair [localhost-startStop-1] INFO  o.s.b.w.s.FilterRegistrationBean - Mapping filter: 'formContentFilter' to: [/*]15:07:25.618 repair [localhost-startStop-1] INFO  o.s.b.w.s.FilterRegistrationBean - Mapping filter: 'hiddenHttpMethodFilter' to: [/*]15:07:25.618 repair [localhost-startStop-1] INFO  o.s.b.w.s.FilterRegistrationBean - Mapping filter: 'errorPageFilter' to: [/*]15:07:25.617 repair [localhost-startStop-1] INFO  o.s.b.w.s.FilterRegistrationBean - Mapping filter: 'characterEncodingFilter' to: [/*]15:07:25.570 repair [localhost-startStop-1] INFO  o.s.b.w.s.ServletRegistrationBean - Servlet statViewServlet mapped to [/druid/*]15:07:25.568 repair [localhost-startStop-1] INFO  o.s.b.w.s.ServletRegistrationBean - Servlet dispatcherServlet mapped to [/]15:07:23.151 repair [localhost-startStop-1] INFO  o.s.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 16648 ms15:07:22.043 repair [localhost-startStop-1] INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$e7ee3861] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)15:07:17.690 repair [localhost-startStop-1] INFO  o.s.d.r.c.RepositoryConfigurationDelegate - Finished Spring Data repository scanning in 421ms. Found 0 repository interfaces.15:07:17.185 repair [localhost-startStop-1] INFO  o.s.d.r.c.RepositoryConfigurationDelegate - Bootstrapping Spring Data repositories in DEFAULT mode.15:07:17.154 repair [localhost-startStop-1] INFO  o.s.d.r.c.RepositoryConfigurationDelegate - Multiple Spring Data modules found, entering strict repository configuration mode!15:07:06.257 repair [localhost-startStop-1] INFO  cn.demo.repair.RepairApplication - The following profiles are active: dev15:07:06.256 repair [localhost-startStop-1] DEBUG cn.demo.repair.RepairApplication - Running with Spring Boot v2.1.0.RELEASE, Spring v5.1.2.RELEASE15:07:06.235 repair [localhost-startStop-1] INFO  cn.demo.repair.RepairApplication - Starting RepairApplication v0.0.1-SNAPSHOT on 10.40.20.119 with PID 102172 (/home/work/data/www/demo-repair/ROOT/WEB-INF/classes started by work in /home/work) :: Spring Boot ::        (v2.1.0.RELEASE) =========|_|==============|___/=/_/_/_/  '  |____| .__|_| |_|_| |_\__, | / / / / \\/  ___)| |_)| | | | | || (_| |  ) ) ) )( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \  .   ____          _            __ _ _复制代码

分析：

分析报错信息，看到DruidDataSource初始化后，出现WARN信息，依赖生成bin的时候（最终生成VpServiceImpl的bin时）出现了空指针异常，如下异常信息：

15:07:53.536 repair [localhost-startStop-1] INFO  c.alibaba.druid.pool.DruidDataSource - {dataSource-1} closed15:07:53.258 repair [localhost-startStop-1] WARN  o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'repairController': Unsatisfied dependency expressed through field 'repairService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'repairServiceImpl': Unsatisfied dependency expressed through field 'approvalService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalServiceImpl': Unsatisfied dependency expressed through field 'vpService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'VpServiceImpl': Invocation of init method failed; nested exception is java.lang.NullPointerException15:07:37.645 repair [localhost-startStop-1] INFO  c.alibaba.druid.pool.DruidDataSource - {dataSource-1} inited复制代码

刚开始以为是SpringBoot集成DruidDataSource出了问题，各种查各种找，没有解决。

在网上搜能引起SpringBoot启动出现以下报错的原因，然也没有解决。

15:07:53.610 repair [localhost-startStop-1] ERROR o.s.boot.SpringApplication - Application run failed Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.异常意思是：应用程序运行启动ApplicationContext失败，要显示条件报告，请在“debug”模式下重新运行应用程序。复制代码

此时觉得可能是出发的方向错了，所以再次回过头来，仔细分析异常堆栈信息，看到两行：

at cn.demo.repair.service.impl.VpServiceImpl.init(VpServiceImpl.java:42)at java.util.Properties.load(Properties.java:341)复制代码

觉得应该是自己程序中：在VpServiceImpl类初始化方法init中，Properties对象load文件时抛出了空指针异常。有了明确方向，开始研究出现问题的代码。

较详细的异常信息摘录：15:13:34.548 repair [localhost-startStop-1] DEBUG o.springframework.jndi.JndiTemplate - Looking up JNDI object with name [java:comp/env/logging.group]	... 74 common frames omitted	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136)	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:307)	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363)	at java.lang.reflect.Method.invoke(Method.java:497)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at cn.demo.repair.service.impl.VpServiceImpl.init(VpServiceImpl.java:42)	at java.util.Properties.load(Properties.java:341)	at java.util.Properties.load0(Properties.java:353)	at java.util.Properties$LineReader.readLine(Properties.java:434)Caused by: java.lang.NullPointerException: null	... 61 common frames omitted复制代码

结果发现直接用SpringBoot自带的SpringApplication.run方法启动应用程序，VpServiceImpl类的init方法不报错，而且应用程序启动成功，跑业务也正常，但是改造打成ROOT.war包后，部署到服务器的Tomcat上，就报错了，应用程序也启动失败。

哎呀，脑仁疼，怎么办，怎么办，怎么办......

脑子里一闪现，可能是打ROOT.war包出的问题，不对，不能再跑偏(因为之前版本部署ROOT.war没问题)，立即弄死这个想法。

正确的招：分析代码，添加详细的日志打印。

然后问题的根源逐渐浮出水面，直接看代码：

@Service@Slf4jpublic class VpServiceImpl implements VpService{    @Value("${vp.path}")    private String vpPath;    /**     * VP列表     */    private Set
    
      vpSet;    /**     * Properties文件     */    private Properties vpProperties;    /**     * 初始化VP列表     */    @PostConstruct    private void init() {        vpProperties = new Properties();        try {            vpProperties.load(ClassLoader.getSystemResourceAsStream(vpPath));        } catch (IOException e) {            log.error("Failed to load the vp.properties file. vpPath = " + vpPath + ", IOException : " + e);        }        vpSet = vpProperties.stringPropertyNames();    }    @Override    public Set
     
       getVpSet() {        return vpSet;    }    @Override    public String getVpLeader(String username) {        if (!vpSet.contains(username)) {            return null;        }        String vpLeader = vpProperties.getProperty(username);        return StringUtils.isEmpty(vpLeader) ? vpProperties.getProperty("vpLeader", "xxx") : vpLeader;    }    @Override    public void setVpSet(Set
      
        vpSet) {        this.vpSet = vpSet;    }    @Override    public boolean addVp(String... vp) {        if (vpSet == null) {            vpSet = new HashSet<>();        }        return vpSet.addAll(Arrays.asList(vp));    }    @Override    public boolean addVp(List
       
         vpList) {        if (vpSet == null) {            vpSet = new HashSet<>();        }        return vpSet.addAll(vpList);    }}复制代码

vp.path在application.yml文件中的配置如下：

vp:  path: vp.properties复制代码

vp.properties在SpringBoot工程的resources目录下：

代码中Properties对象vpProperties转载InputStream输入流，而InputStream输入流是通过获取vp.properties文件资源转换而来的，这里是有问题的，ClassLoader.getSystemResourceAsStream(vpPath)在实际线上服务器环境中找不到vp.properties文件，所以报了空指针异常，导致线上应用程序启动失败。

解决方法：

代码修改：

@PostConstructprivate void init() {    vpProperties = new Properties();    try {        vpProperties.load(VpServiceImpl.class.getClassLoader().getResourceAsStream(vpPath));    } catch (Exception e) {        log.error("Failed to load the vp.properties file. vpPath = " + vpPath + ", Exception : " + e);    }    vpSet = vpProperties.stringPropertyNames();}复制代码

修改点：

将vpProperties.load(ClassLoader.getSystemResourceAsStream(vpPath));改为vpProperties.load(VpServiceImpl.class.getClassLoader().getResourceAsStream(vpPath));

catch所有异常，不会导致应用程序启动失败。

总结：

程序报错了，不要瞎考虑，乱认为，一定要仔细研究异常栈信息，仔细研究异常栈信息，仔细研究异常栈信息（重要的事说三遍）。

知识扩展：

写累了，随后再扩展吧。