JEasy | JEasy是一个轻量级、易使用扩展的Java开发框架，可实现插件方式的开发和部署。

Try the npm pack command in your project folder. It should create a .tgz file structured correctly. It should be something like this (without the node_modules folder):

aNewRulesEngine is a static method in RulesEngineBuilder (according to the documentation: https://github.com/j-easy/easy-rules/blob/master/easy-rules-core/src/main/java/org/jeasy/rules/core/RulesEngineBuilder.java) - but in your code sample, you are also trying to instantiate an instance for RulesEngineBuilder.

Perhaps this code will work better:

A Facts object is essentially a hashmap. So by design, you cannot put two facts with the same key.

I see in your example that the people fact is an array. Now how to handle arrays in a mvel expression is another story. To be honest, the best answer I can give is to look at the MVEL docs: https://github.com/imona/tutorial/wiki/MVEL-Guide#arrays

What I want to achieve is evaluate the rules on multiple facts in one fire of the rule engine.

I'm not sure this is possible with easy rules. I think you can:

• Either flat map your facts
• Or call fire multiple times on different facts

Hope this helps.