SpringBoot專案中遇到的異常

讓蛋蛋飛發表於2019-02-15

問題：

SpringBoot專案中整合了阿里開源Druid資料來源，本地開發環境直接啟動SpringBoot應用(SpringApplication.run方法)，啟動成功，由於正式應用是部署在伺服器已有的Tomcat環境中，經過改造將SpringBoot專案打成ROOT.war包後，部署到伺服器上，啟動應用程式時，報錯了，錯誤資訊如下所示：

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 TCCL
15:13:34.599 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.NullPointerException
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.

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} closed
15:07:53.258 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.NullPointerException
15:07:37.645 repair [localhost-startStop-1] INFO  c.alibaba.druid.pool.DruidDataSource - {dataSource-1} inited
15:07:28.073 repair [localhost-startStop-1] INFO  c.a.d.s.b.a.DruidDataSourceAutoConfigure - Init DruidDataSource
15:07:25.620 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 ms
15:07:22.043 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: dev
15:07:06.256 repair [localhost-startStop-1] DEBUG cn.demo.repair.RepairApplication - Running with Spring Boot v2.1.0.RELEASE, Spring v5.1.2.RELEASE
15:07:06.235 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)
 =========|_|==============|___/=/_/_/_/
  '  |____| .__|_| |_|_| |_\__, | / / / /
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
  .   ____          _            __ _ _
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分析：

分析報錯資訊，看到DruidDataSource初始化後，出現WARN資訊，依賴生成bin的時候（最終生成VpServiceImpl的bin時）出現了空指標異常，如下異常資訊：

15:07:53.536 repair [localhost-startStop-1] INFO  c.alibaba.druid.pool.DruidDataSource - {dataSource-1} closed
15:07:53.258 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.NullPointerException
15:07:37.645 repair [localhost-startStop-1] INFO  c.alibaba.druid.pool.DruidDataSource - {dataSource-1} inited
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剛開始以為是SpringBoot整合DruidDataSource出了問題，各種查各種找，沒有解決。

在網上搜能引起SpringBoot啟動出現以下報錯的原因，然也沒有解決。

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.

異常意思是：應用程式執行啟動ApplicationContext失敗，要顯示條件報告，請在“debug”模式下重新執行應用程式。
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此時覺得可能是出發的方向錯了，所以再次回過頭來，仔細分析異常堆疊資訊，看到兩行：

at cn.demo.repair.service.impl.VpServiceImpl.init(VpServiceImpl.java:42)
at java.util.Properties.load(Properties.java:341)
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覺得應該是自己程式中：在VpServiceImpl類初始化方法init中，Properties物件load檔案時丟擲了空指標異常。有了明確方向，開始研究出現問題的程式碼。

較詳細的異常資訊摘錄：

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
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結果發現直接用SpringBoot自帶的SpringApplication.run方法啟動應用程式，VpServiceImpl類的init方法不報錯，而且應用程式啟動成功，跑業務也正常，但是改造打成ROOT.war包後，部署到伺服器的Tomcat上，就報錯了，應用程式也啟動失敗。

哎呀，腦仁疼，怎麼辦，怎麼辦，怎麼辦......

腦子裡一閃現，可能是打ROOT.war包出的問題，不對，不能再跑偏(因為之前版本部署ROOT.war沒問題)，立即弄死這個想法。

正確的招：分析程式碼，新增詳細的日誌列印。

然後問題的根源逐漸浮出水面，直接看程式碼：

@Service
@Slf4j
public class VpServiceImpl implements VpService{

    @Value("${vp.path}")
    private String vpPath;

    /**
     * VP列表
     */
    private Set<String> vpSet;

    /**
     * Properties檔案
     */
    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<String> 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<String> 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<String> vpList) {
        if (vpSet == null) {
            vpSet = new HashSet<>();
        }
        return vpSet.addAll(vpList);
    }
}
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vp.path在application.yml檔案中的配置如下：

vp:
  path: vp.properties
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vp.properties在SpringBoot工程的resources目錄下：

程式碼中Properties物件vpProperties轉載InputStream輸入流，而InputStream輸入流是通過獲取vp.properties檔案資源轉換而來的，這裡是有問題的，ClassLoader.getSystemResourceAsStream(vpPath)在實際線上伺服器環境中找不到vp.properties檔案，所以報了空指標異常，導致線上應用程式啟動失敗。

解決方法：

程式碼修改：

@PostConstruct
private 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();
}
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修改點：

將vpProperties.load(ClassLoader.getSystemResourceAsStream(vpPath));改為vpProperties.load(VpServiceImpl.class.getClassLoader().getResourceAsStream(vpPath));
catch所有異常，不會導致應用程式啟動失敗。

總結：

程式報錯了，不要瞎考慮，亂認為，一定要仔細研究異常棧資訊，仔細研究異常棧資訊，仔細研究異常棧資訊（重要的事說三遍）。

知識擴充套件：

寫累了，隨後再擴充套件吧。

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SpringBoot專案中遇到的異常

問題：

分析：

解決方法：

總結：

知識擴充套件：

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