在调试器中查看 Java 中的异常时,您经常会看到原因是无限递归到自身的(我假设它是无限的)。
例如:
Exception1,
Caused by -> Exception2
Caused by -> Exception2
Caused by -> Exception2
为什么是这样?
注意:这是在调试器中查看代码时,在这种情况下是 Eclipse。
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一个异常,它是在没有使用一个有原因的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 }