Spring Boot 3.x特性-自定义FailureAnalyzer

自定义FailureAnalyzer

FailureAnalyzer拦截Spring Boot程序启动异常,将异常信息包装成可读性更好的消息，并且包装成FailureAnalysis对象。Spring Boot默认提供了大量的FailureAnalyzer。

如果要实现自定义的FailureAnalyzer,只需要实现AbstractFailureAnalyzer抽象类,接下来先模拟程序启动异常。

public class CustomerFailException extends RuntimeException {
}

@SpringBootApplication
public class CustomerFailureanalyzerApplication {


    public static void main(String[] args) {
        SpringApplication.run(CustomerFailureanalyzerApplication.class, args);
    }

    @Bean
    public TestBean testBean() {
        return new TestBean();
    }

    class TestBean {
        public TestBean() {
            throw new CustomerFailException();
        }
    }
}

程序启动报错如下：

接下来自定义FailureAnalyzer,处理CustomerFailException异常。

1. 创建自定义 FailureAnalyzer 继承 AbstractFailureAnalyzer

public class ArithmeticExceptionFailureAnalyzer extends AbstractFailureAnalyzer<CustomerFailException> {
    @Override
    protected FailureAnalysis analyze(Throwable rootFailure, CustomerFailException cause) {
        return new FailureAnalysis(cause.getMessage(), "检测Bean初始化是否正常!", cause);
    }
}

2.注册自定义FailureAnalyzer,在resources目录新建 META-INF/spring.factories文件，添加如下内容:

org.springframework.boot.diagnostics.FailureAnalyzer=com.example.customerfailureanalyzer.ArithmeticExceptionFailureAnalyzer

3.启动应用程序

注意:main线程抛出的异常无法处理,如下例子:

@SpringBootApplication
public class CustomerFailureanalyzerApplication {


    public static void main(String[] args) {
        TestBean testBean=new TestBean();
        SpringApplication.run(CustomerFailureanalyzerApplication.class, args);
    }
    static class TestBean {
        public TestBean() {
            throw new CustomerFailException();
        }
    }
}

启动程序: