评估Camunda DMN决策时的异常

Question

我正在尝试解析一个示例决策表，但是在异常下面

org.camunda.bpm.dmn.feel.impl.FeelException:感觉/SCALA-01008在计算表达式时出错:未能计算表达式‘Fall’：没有找到名称‘cellInput’的变量

我使用Camunda版本4.12.0及以下版本创建了dmn文件，这是用于解析决策的java代码。

VariableMap variables = Variables
.putValue(“season”, “Spring”);

DmnEngine dmnEngine = DmnEngineConfiguration.createDefaultDmnEngineConfiguration().buildEngine();

InputStream inputStream = DishDecider.class.getResourceAsStream("/dishTest.dmn");

DmnModelInstance dmnModelInstance = Dmn.readModelFromStream(inputStream);

List decisions = dmnEngine.parseDecisions(dmnModelInstance);

DmnDecision decision = decisions.get(0);

DmnDecisionTableResult result = dmnEngine.evaluateDecisionTable(decision, variables);

String desiredDish = result.getSingleResult().getSingleEntry();
System.out.println("Dish Decision:\n\tI would recommend to serve: " + desiredDish);

下面是用4.12.0创建的dmn文件

    <?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="https://www.omg.org/spec/DMN/20191111/MODEL/" xmlns:dmndi="https://www.omg.org/spec/DMN/20191111/DMNDI/" xmlns:dc="http://www.omg.org/spec/DMN/20180521/DC/" xmlns:camunda="http://camunda.org/schema/1.0/dmn" id="decision" name="Dish" namespace="http://camunda.org/schema/1.0/dmn" exporter="Camunda Modeler" exporterVersion="4.12.0">
    <decision id="Decision_0iitlac" name="Dish">
        <decisionTable id="DecisionTable_0gwyugh" hitPolicy="ANY">
            <input id="Input_1" label="Season" camunda:inputVariable="season">
                <inputExpression id="InputExpression_1" typeRef="string">
                    <text>season</text>
                </inputExpression>
            </input>
            <output id="Output_1" label="Dish" name="desiredDish" typeRef="string" />
            <rule id="DecisionRule_0oq0hav">
                <description>-</description>
                <inputEntry id="UnaryTests_0m9w26w">
                    <text>"Fall"</text>
                </inputEntry>
                <outputEntry id="LiteralExpression_0ii151o">
                    <text>"Spareribs"</text>
                </outputEntry>
            </rule>
            <rule id="DecisionRule_1atwuts">
                <description>-</description>
                <inputEntry id="UnaryTests_1bnxqqw">
                    <text>"Winter"</text>
                </inputEntry>
                <outputEntry id="LiteralExpression_1bzzfsr">
                    <text>"RoastBeer"</text>
                </outputEntry>
            </rule>
            <rule id="DecisionRule_0kf4y0a">
                <inputEntry id="UnaryTests_09pkbsv">
                    <text>"Spring"</text>
                </inputEntry>
                <outputEntry id="LiteralExpression_0fx9hii">
                    <text>"Dry Aged steak"</text>
                </outputEntry>
            </rule>
            <rule id="DecisionRule_020pynb">
                <description>Less Effort</description>
                <inputEntry id="UnaryTests_10ydtir">
                    <text>"Fall","Winter","Spring"</text>
                </inputEntry>
                <outputEntry id="LiteralExpression_0byu0h6">
                    <text>"Stew"</text>
                </outputEntry>
            </rule>
            <rule id="DecisionRule_19jjhib">
                <description>Hey why not</description>
                <inputEntry id="UnaryTests_03eg1qd">
                    <text>"Summer"</text>
                </inputEntry>
                <outputEntry id="LiteralExpression_0cx6p63">
                    <text>"Light Sald"</text>
                </outputEntry>
            </rule>
            <rule id="DecisionRule_1cnr8kg">
                <inputEntry id="UnaryTests_12w0ceb">
                    <text></text>
                </inputEntry>
                <outputEntry id="LiteralExpression_1g1nomo">
                    <text></text>
                </outputEntry>
            </rule>
        </decisionTable>
    </decision>
    <dmndi:DMNDI>
        <dmndi:DMNDiagram>
            <dmndi:DMNShape dmnElementRef="Decision_0iitlac">
                <dc:Bounds height="80" width="180" x="160" y="100" />
            </dmndi:DMNShape>
        </dmndi:DMNDiagram>
    </dmndi:DMNDI>
</definitions>

任何帮助都是非常感谢的。

Answer 1

您编写java代码来解析DMN表是有原因的吗？Camunda引擎将为您解析和评估表，作为运行流程的一部分。

尽管如此，您的Java代码似乎并不完整，因为我看不到您在任何变量中输入的位置。我假设您应该提供一个要评估的输入变量cellInput。

dg

Answer 2

在“季节”列中，您将字段“输入变量”的默认值从cellInput更改为“季节”。从输入变量字段中移除季节，并确保数据季节的值被传入。