什麼導致異常中的遞歸原因？

Question

在調試器中查看Java中的異常時，您經常會看到原因無限遞歸（我認爲它是無限的）。

e.g：

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

這是爲什麼？

注意：這是在調試器中查看代碼的情況，在這種情況下是Eclipse。

Answer 1

望着source code of Throwable：

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; 

所以我猜你看到的是這是不使用，這需要引起一個構造函數創建一個例外。

您將在調試器看到這一點，但getCause採取不返回遞歸引用的護理：

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