什么原因导致异常中的递归原因？

Question

在调试器中查看Java中的异常时,您经常会看到原因无限递归(我认为它是无限的).

例如:

Exception1, 
  Caused by -> Exception2 
     Caused by -> Exception2
        Caused by -> Exception2 

为什么是这样？

注意:这是在查看调试器中的代码时,在这种情况下是Eclipse.

Answer 1

查看Throwable的源代码:

  187       /**
  188        * The throwable that caused this throwable to get thrown, or null if this
  189        * throwable was not caused by another throwable, or if the causative
  190        * throwable is unknown.  If this field is equal to this throwable itself,
  191        * it indicates that the cause of this throwable has not yet been
  192        * initialized.
  193        *
  194        * @serial
  195        * @since 1.4
  196        */
  197       private Throwable cause = this;

所以我猜你所看到的是一个Exception,它是在不使用其中一个构造函数的情况下创建的.

您将在调试器中看到这一点,但getCause负责不返回递归引用:

  414       public synchronized Throwable getCause() {
  415           return (cause==this ? null : cause);
  416       }