【Java】自定义SpringApplicationRunListener实例化出现异常

题目描述

自定义SpringApplicationRunListener实例化出现异常：非法参数异常
Spring Boot 2.1.6
JDK 1.8.0_192

题目来源及自己的思路

我跟着教程写自定义的SpringApplicationRunListener对象，尝试一下该接口下的7个Listener方法。
我跟着代码走走走，好像是看不懂的样子，哈哈哈哈……
是在createSpringFactoriesInstances函数的ClassUtils.forName(name, classLoader);出现问题
但可惜我看不懂，只知道应该是装载类，但我写的MySpringApplicationRunListener写了有参构造器.

【Java】自定义SpringApplicationRunListener实例化出现异常

相关代码

public class MySpringApplicationRunListener implements SpringApplicationRunListener {
public MySpringApplicationRunListener(SpringApplication application, String[] args) {
}
@Override*7
starting/environmentPrepared/contextPrepared/contextLoaded/started/running/failed

你期待的结果是什么？实际看到的错误信息又是什么？

Exception in thread "main" java.lang.IllegalArgumentException:
Cannot instantiate interface org.springframework.context.ApplicationListener :
com.inbreeze.springboot.listener.MySpringApplicationRunListener
Caused by: java.lang.IllegalArgumentException:
class com.inbreeze.springboot.listener.MySpringApplicationRunListener
is not assignable to interface
org.springframework.context.ApplicationListener
Exception in thread "main" java.lang.IllegalArgumentException: Cannot instantiate interface org.springframework.context.ApplicationListener : com.inbreeze.springboot.listener.MySpringApplicationRunListener
at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:437)
at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:419)
at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:412)
at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:269)
at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:249)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202)
at com.inbreeze.springboot.SpringBoot07SourcecodeApplication.main(SpringBoot07SourcecodeApplication.java:10)
Caused by: java.lang.IllegalArgumentException: class com.inbreeze.springboot.listener.MySpringApplicationRunListener is not assignable to interface org.springframework.context.ApplicationListener
at org.springframework.util.Assert.assignableCheckFailed(Assert.java:673)
at org.springframework.util.Assert.isAssignable(Assert.java:604)
at org.springframework.util.Assert.isAssignable(Assert.java:635)
at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:431)
... 7 more
Process finished with exit code 1

现在的问题是，我不知道该如何正确写一个自定义的SpringApplicationRunListener完全实现类
我翻阅了Spring.io current/reference 并没有相关实例【至于又没类似的讲解，我还真没找到】

求救，大佬们5555

回答

为了回答你的问题，特意注册了账号，不过感觉你的问题应该自己解决了吧。

把spring.factories发出来，估计是你的加载类不对，应该是：
org.springframework.boot.SpringApplicationRunListener=\
...

以上是 【Java】自定义SpringApplicationRunListener实例化出现异常 的全部内容， 来源链接： utcz.com/a/90687.html

回到顶部