【Java】获取有效的异常调用堆栈信息

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项目中，可能会遇到虽然知道发生了异常，但是不知道异常是什么，由于调用栈信息不全，从日志上看不出具体问题；主要原因是异常调用栈太深，导致异常信息被截断。

下面这个方法可以获取根异常，将中间的非主要异常过滤掉。

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/**  
 * 获取根异常，防止调用链太长，导致有效信息被截断 
 */
 public static Throwable getRootThrowable(Throwable e) {  
    if (Objects.isNull(e)) {  
        return null;  
    }  
  
    Throwable lastCause = e;  
    Throwable currentCause = e.getCause();  
    while (Objects.nonNull(currentCause)) {  
        lastCause = currentCause;  
        currentCause = currentCause.getCause();  
    }  
  
    return lastCause;  
}

示例

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@Slf4j  
public class ThrowableTestDemo {  
    public static void main(String[] args) {  
        test();  
    }  
  
    private static void test() {  
        try {  
            try {  
                try {  
                    try {  
                        try {  
                            int i = 1 / 0;  
                        } catch (Exception e) {  
                            throw new RuntimeException(e);  
                        }  
                    } catch (Exception e) {  
                        throw new RuntimeException(e);  
                    }  
                } catch (Exception e) {  
                    throw new RuntimeException(e);  
                }  
            } catch (Exception e) {  
                throw new RuntimeException(e);  
            }  
        } catch (Exception e) {  
            log.warn("处理前：", e);  
            System.out.println("=======>");  
            log.warn("处理后：", getRootThrowable(e));  
        }  
    }
}
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10:38:13.122 [main] WARN com.coocaa.media.sync.ThrowableTestDemo - 处理前：
java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ArithmeticException: / by zero
	at com.coocaa.media.sync.ThrowableTestDemo.test(ThrowableTestDemo.java:36)
	at com.coocaa.media.sync.ThrowableTestDemo.main(ThrowableTestDemo.java:15)
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ArithmeticException: / by zero
	at com.coocaa.media.sync.ThrowableTestDemo.test(ThrowableTestDemo.java:33)
	... 1 common frames omitted
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ArithmeticException: / by zero
	at com.coocaa.media.sync.ThrowableTestDemo.test(ThrowableTestDemo.java:30)
	... 1 common frames omitted
Caused by: java.lang.RuntimeException: java.lang.ArithmeticException: / by zero
	at com.coocaa.media.sync.ThrowableTestDemo.test(ThrowableTestDemo.java:27)
	... 1 common frames omitted
Caused by: java.lang.ArithmeticException: / by zero
	at com.coocaa.media.sync.ThrowableTestDemo.test(ThrowableTestDemo.java:25)
	... 1 common frames omitted
	
=======>
10:38:13.124 [main] WARN com.coocaa.media.sync.ThrowableTestDemo - 处理后：
java.lang.ArithmeticException: / by zero
	at com.coocaa.media.sync.ThrowableTestDemo.test(ThrowableTestDemo.java:25)
	at com.coocaa.media.sync.ThrowableTestDemo.main(ThrowableTestDemo.java:15)