Summary of several ways to prevent SpringBoot program from crashing

In Spring Boot applications, preventing program crashes and ensuring application stability can be achieved in the following ways:

1. Global exception handling

Using Spring's@ControllerAdviceand@ExceptionHandlerAnnotation: Handle all uncaught exceptions to prevent exceptions from directly causing program crashes.

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler()
    public ResponseEntity<String> handleException(Exception e) {
        // Log the log and return a general error response        return (HttpStatus.INTERNAL_SERVER_ERROR).body("Server error, please try again later.");
    }
}

2. Use try-catch to catch exceptions

In business logic, use the code block that may throw exceptionstry-catchCatch exceptions and handle them properly.

public void someMethod() {
    try {
        // Code that may throw exceptions    } catch (SpecificException e) {
        // Handle specific exceptions    } catch (Exception e) {
        //Catch other exceptions    }
}

3. Use a circuit breaker

Prevent a single service failure from crashing the entire system by integrating circuit breaker libraries like Resilience4j or Hystrix.

@RestController
public class MyController {

    @GetMapping("/myService")
    @CircuitBreaker(name = "myService", fallbackMethod = "fallbackMethod")
    public String callMyService() {
        // Invoke external service that may fail    }

    public String fallbackMethod(Exception e) {
        return "External service is not available, please try again later.";
    }
}

4. Set maximum memory and thread pool limits

Make sure your application has sufficient resource configuration and set the appropriate maximum memory usage and thread pool size to prevent resource exhaustion from crashing.

# 
server:
  tomcat:
    threads:
      max: 200

5. Monitoring and logging

Monitor application performance and abnormalities in real time. Use logging (such as Logback, Log4j) and APM (such as Prometheus, Grafana) tools to track problems and identify potential risks in advance.

6. Graceful Shutdown

Configure the application to support graceful downtime, ensuring that the current request can be completed when shut down, freeing up resources.

server:
  shutdown: graceful

7. Health check and automatic restart

Use Spring Boot's Actuator to monitor the health of your application and integrate with Kubernetes or other container orchestration tools to automatically restart the instances that are having problems.

management:
  endpoints:
    web:
      exposure:
        include: health

8. Database connection pool configuration

Configure the database connection pool rationally to prevent connection leakage or insufficient connections in the pool from causing service downtime.

spring:
  datasource:
    hikari:
      maximum-pool-size: 50
      minimum-idle: 10

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