java.lang.IllegalArgumentException: Value must not be null异常排查

qq_32392629

10102人浏览 · 2022-08-27 15:47:42

qq_32392629 · 2022-08-27 15:47:42 发布

java.lang.IllegalArgumentException: Value must not be null异常排查

问题

上线新版本，系统一开始运行，系统直接报java.lang.IllegalArgumentException: Value must not be null异常具体的日志打印如下：

java.lang.IllegalArgumentException: Value must not be null
at org.springframework.util.Assert.notNull(Assert.java:198)
at org.springframework.boot.actuate.health.HealthServletWebOperationAdapter.handle(AbstractWebMvcEndpointHandlerMapping.java:305)
at org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(AbstractWebMvcEndpointHandlerMapping.java:388)

分析

根据at net.xmeye.vms.actuate.VersionHealthIndicator.health(VersionHealthIndicator.java:26)找到程序中的VersionHealthIndicator类

@Component
public class VersionHealthIndicator implements HealthIndicator, ApplicationRunner {
    private String version;
    private String timestamp;

    @Override
    public Health health() {
        return Health.status(Status.UP)
                .withDetail("package", version)
                .withDetail("buildTime", timestamp)
                .build();
    }

    @Override
    public void run(ApplicationArguments args) throws Exception {
        System.out.println("VersionHealthIndicator start running");
        try (InputStream inputStream = VersionHealthIndicator.class.getClassLoader()
                .getResourceAsStream("packageinfo.properties")) {
            Properties properties = new Properties();
            properties.load(inputStream);
            version = properties.getProperty("version", "");
            timestamp = properties.getProperty("timestamp", "");
        }
    }
}

在Health.status(Status.UP).withDetail(“package”, version)抛出的异常。

继续看withDetail(“package”, version)方法，是Assert.notNull(value, “Value must not be null”)抛出的 java.lang.IllegalArgumentException异常，并打印了"Value must not be null"。

public Builder withDetail(String key, Object value) {
   Assert.notNull(key, "Key must not be null");
   Assert.notNull(value, "Value must not be null");
   this.details.put(key, value);
   return this;
}

应该是传入的参数version的值为null。withDetail(“package”, version)方法中version参数是通过实现ApplicationRunner接口加载的。可能的原因是实现ApplicationRunner接口的VersionHealthIndicator类的run方法没有正常运行，或者是读取文件时发生了异常。但是没有报IO相关异常。

debug查看具体的执行过程

调用执行ApplicationRunner.run()、CommandLineRunner.run()的callRunners方法，会将实现了接口的类进行排序。

private void callRunners(ApplicationContext context, ApplicationArguments args) {
   List<Object> runners = new ArrayList<>();
   runners.addAll(context.getBeansOfType(ApplicationRunner.class).values());
   runners.addAll(context.getBeansOfType(CommandLineRunner.class).values());
   AnnotationAwareOrderComparator.sort(runners);
   for (Object runner : new LinkedHashSet<>(runners)) {
      if (runner instanceof ApplicationRunner) {
         callRunner((ApplicationRunner) runner, args);
      }
      if (runner instanceof CommandLineRunner) {
         callRunner((CommandLineRunner) runner, args);
      }
   }
}

具体的排序如下
在这里插入图片描述
会按照InitDefaultGroupRunner、SmartAdminStartupRunner、RuntimeHealthIndicator、VersionHealthIndicator依次执行。

程序执行完InitDefaultGroupRunner的run方法后，debug进入到执行SmartAdminStartupRunner的run方法，线程一直在执行SmartAdminStartupRunner的run方法。

SmartAdminStartupRunner的run方法执行了响应状态码常量的初始化，以及 aisvrService.startAnalysis()方法。

@Component
public class SmartAdminStartupRunner implements CommandLineRunner {

   @Autowired
   private AisvrService aisvrService;

    @Override
    public void run(String... args) {
        ResponseCodeConst.init();
        aisvrService.startAnalysis();
    }

}

startAnalysis()方法中有一个while()循环，如果alarmMsgAnalysis条件变量为真，线程就会一直运行startAnalysis()方法。

    public void startAnalysis() {
        while (alarmMsgAnalysis) {
           //代码省去
        }
    }

后面的RuntimeHealthIndicator、VersionHealthIndicator的run方法就都不会被执行。version变量的初始化依赖于run()方法的执行，而run()方法没有正常运行，使得version变量没有正常初始化。当执行health()方法时就会产生IllegalArgumentException异常。