流口水错误 : Unable to find @positional field

Question

我创建了一个流口水文件 PersonTotalAccountsBalance.drl 如下。我是规则引擎世界的初学者。

package com.auhuman.rules;

import com.auhuman.Person;
import com.auhuman.Account;

function float getTotalBalance(Person person) {
     float totalBalance = 0;
     for (Account account : person.getAccounts()){
         totalBalance += account.getBalance();
     }
     return totalBalance;
}

rule "PersonTotalAccountsBalance"
    when
        $node : Person(active == true)
    then
        float totalBalance = getTotalBalance($node)

        modify($node) {
           setTotalBalance(totalBalance);
        }
end

编译后我得到以下错误

Unable to compile the file: PersonTotalAccountsBalance.drl. Errors = [Unable to find @positional field 0 for class Person
 : [Rule name='PersonTotalAccountsBalance']
]

Answer 1

虽然这个答案很旧:
我有同样的错误消息，但我正在处理 xls 中的决策表(excel) 格式。表看起来是这样的:

请注意 $order:Order在合并的单元格中跨越 CONDITION和 ACTION列。该单元格只允许高于 CONDITION表，而不是 ACTION表。取消合并后，我不再收到错误消息:

在 ACTION 中定义错误的值时，我遇到了非常相似的错误用于设置属性的列。当对 String 使用不带引号的值时模型中的属性 Order我收到以下错误:

Unable to get KieModule, Errors Existed: Error Messages:
Message [id=1, kieBase=defaultKieBase, level=ERROR, path=status_rules/status.xls, line=21, column=0
   text=Rule Compilation error The method setNextStatus(String) in the type Order is not applicable for the arguments (int)]
Message [id=2, kieBase=defaultKieBase, level=ERROR, path=status_rules/status.xls, line=5, column=0
   text=Rule Compilation error The method setNextStatus(String) in the type Order is not applicable for the arguments (int)]
Message [id=3, kieBase=defaultKieBase, level=ERROR, path=status_rules/status.xls, line=13, column=0
   text=Rule Compilation error The method setNextStatus(String) in the type Order is not applicable for the arguments (int)]

但是，在这种情况下，错误消息要精确得多。