为什么我得到“可能的空指针取消引用"?警告? [英] Why do I get a "Possible null pointer dereference" warning?

问题描述

为什么FindBugs向我提出以下警告: 可能会取消引用空指针 .

Why do FindBugs raises me the following warning: Possible null pointer dereference.

current = myService.getCategoryParent(current);
if (current != null) { // The warning appears here

我不明白如何针对null测试变量会取消对它的引用.

I don't understand how testing a variable against null could dereference it.

推荐答案

我怀疑错误/警告实际上是在您指示的行上 上.

I suspect the error/warning is actually on the line above the line you've indicated.

//                   here ------------v
current = myService.getCategoryParent(current);
if (current != null) {

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