我刚刚升级到Drools 5，XML规则将无法加载 [英] I just upgraded to drools 5 and the xml rules will not load

问题描述

升级到Drools 5时，有效的Drools 4 xml规则不起作用。 Drools只会抛出无用的null指针异常。问题可能是什么？

When upgrading to drools 5, valid drools 4 xml rules do not work. Drools just throws an unhelpful null pointer exception. What can the problem be?

推荐答案

问题是Drools 5更改了名称空间。将xmlns = http://drools.org/drools-4.0替换为xmlns = http://drools.org/drools-5.0，至少对于您所需要的简单规则。

The problem is that Drools 5 changed the namespace. Replace xmlns="http://drools.org/drools-4.0" with xmlns="http://drools.org/drools-5.0" and at least for simple rules that is all you need.

我希望这可以帮助某人省去我刚刚遇到的无记录更改带来的头痛。

I hope that helps save someone the headache I just got dealing with this undocumented change.

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