未找到评估器定义的 Drools 类

【问题标题】：Drools Class not found for evaluator definition未找到评估器定义的 Drools 类
【发布时间】：2026-02-08 06:15:01
【问题描述】：

我正在使用 Drools 5.5.0-Final，突然间，我遇到了这个异常

我把所有的库都放到我的项目里了，结果还是一样的

org.drools.RuntimeDroolsException: Class not found for evaluator definition: org.drools.base.evaluators.EqualityEvaluatorsDefinition
    at org.drools.base.evaluators.EvaluatorRegistry.addEvaluatorDefinition(EvaluatorRegistry.java:136)
    at org.drools.compiler.PackageBuilderConfiguration.buildEvaluatorRegistry(PackageBuilderConfiguration.java:550)
    at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:196)
    at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:170)
    at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:300)
    at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:228)
    at org.drools.builder.impl.KnowledgeBuilderFactoryServiceImpl.newKnowledgeBuilder(KnowledgeBuilderFactoryServiceImpl.java:34)
    at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:46)
    at com.drools.optimizer.AppExpertSystem.readKnowledgeBase(AppExpertSystem.java:130)
    at com.drools.optimizer.AppExpertSystem.loadKnowledgeBase(AppExpertSystem.java:115)
    at com.drools.optimizer.AppExpertSystem.<init>(AppExpertSystem.java:46)
    at eventlauncher.OptimizerLauncher.NuevoEscenario(OptimizerLauncher.java:57)
    at eventlauncher.DemoPruebas.main(DemoPruebas.java:18)
Caused by: java.lang.ClassNotFoundException: Unable to load class: org.drools.base.evaluators.EqualityEvaluatorsDefinition
    at org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:92)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at org.drools.base.evaluators.EvaluatorRegistry.addEvaluatorDefinition(EvaluatorRegistry.java:132)
    ... 12 more
Exception in thread "main" java.lang.RuntimeException: org.drools.RuntimeDroolsException: Class not found for evaluator definition: org.drools.base.evaluators.EqualityEvaluatorsDefinition
    at com.drools.optimizer.AppExpertSystem.loadKnowledgeBase(AppExpertSystem.java:122)
    at com.drools.optimizer.AppExpertSystem.<init>(AppExpertSystem.java:46)
    at eventlauncher.OptimizerLauncher.NuevoEscenario(OptimizerLauncher.java:57)
    at eventlauncher.DemoPruebas.main(DemoPruebas.java:18)
Caused by: org.drools.RuntimeDroolsException: Class not found for evaluator definition: org.drools.base.evaluators.EqualityEvaluatorsDefinition
    at org.drools.base.evaluators.EvaluatorRegistry.addEvaluatorDefinition(EvaluatorRegistry.java:136)
    at org.drools.compiler.PackageBuilderConfiguration.buildEvaluatorRegistry(PackageBuilderConfiguration.java:550)
    at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:196)
    at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:170)
    at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:300)
    at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:228)
    at org.drools.builder.impl.KnowledgeBuilderFactoryServiceImpl.newKnowledgeBuilder(KnowledgeBuilderFaorg.drools.RuntimeDroolsException: Class not found for evaluator definition: org.drools.base.evaluators.EqualityEvaluatorsDefinition
    at org.drools.base.evaluators.EvaluatorRegistry.addEvaluatorDefinition(EvaluatorRegistry.java:136)
    at org.drools.compiler.PackageBuilderConfiguration.buildEvaluatorRegistry(PackageBuilderConfiguration.java:550)
    at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:196)
    at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:170)
    at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:300)
    at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:228)
    at org.drools.builder.impl.KnowledgeBuilderFactoryServiceImpl.newKnowledgeBuilder(KnowledgeBuilderFactoryServiceImpl.java:34)
    at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:46)
    at com.drools.optimizer.AppExpertSystem.readKnowledgeBase(AppExpertSystem.java:130)
    at com.drools.optimizer.AppExpertSystem.loadKnowledgeBase(AppExpertSystem.java:115)
    at com.drools.optimizer.AppExpertSystem.<init>(AppExpertSystem.java:46)
    at eventlauncher.OptimizerLauncher.NuevoEscenario(OptimizerLauncher.java:57)
    at eventlauncher.DemoPruebas.main(DemoPruebas.java:18)
Caused by: java.lang.ClassNotFoundException: Unable to load class: org.drools.base.evaluators.EqualityEvaluatorsDefinition
    at org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:92)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at org.drools.base.evaluators.EvaluatorRegistry.addEvaluatorDefinition(EvaluatorRegistry.java:132)
    ... 12 more
Exception in thread "main" java.lang.RuntimeException: org.drools.RuntimeDroolsException: Class not found for evaluator definition: org.drools.base.evaluators.EqualityEvaluatorsDefinition
    at com.drools.optimizer.AppExpertSystem.loadKnowledgeBase(AppExpertSystem.java:122)
    at com.drools.optimizer.AppExpertSystem.<init>(AppExpertSystem.java:46)
    at eventlauncher.OptimizerLauncher.NuevoEscenario(OptimizerLauncher.java:57)
    at eventlauncher.DemoPruebas.main(DemoPruebas.java:18)
Caused by: org.drools.RuntimeDroolsException: Class not found for evaluator definition: org.drools.base.evaluators.EqualityEvaluatorsDefinition
    at org.drools.base.evaluators.EvaluatorRegistry.addEvaluatorDefinition(EvaluatorRegistry.java:136)
    at org.drools.compiler.PackageBuilderConfiguration.buildEvaluatorRegistry(PackageBuilderConfiguration.java:550)
    at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:196)
    at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:170)
    at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:300)
    at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:228)
    at org.drools.builder.impl.KnowledgeBuilderFactoryServiceImpl.newKnowledgeBuilder(KnowledgeBuilderFactoryServiceImpl.java:34)
    at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:46)
    at com.drools.optimizer.AppExpertSystem.readKnowledgeBase(AppExpertSystem.java:130)
    at com.drools.optimizer.AppExpertSystem.loadKnowledgeBase(AppExpertSystem.java:115)
    ... 3 more
Caused by: java.lang.ClassNotFoundException: Unable to load class: org.drools.base.evaluators.EqualityEvaluatorsDefinition
    at org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:92)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at org.drools.base.evaluators.EvaluatorRegistry.addEvaluatorDefinition(EvaluatorRegistry.java:132)
    ... 12 morectoryServiceImpl.java:34)
    at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:46)
    at com.drools.optimizer.AppExpertSystem.readKnowledgeBase(AppExpertSystem.java:130)
    at com.drools.optimizer.AppExpertSystem.loadKnowledgeBase(AppExpertSystem.java:115)
    ... 3 more
Caused by: java.lang.ClassNotFoundException: Unable to load class: org.drools.base.evaluators.EqualityEvaluatorsDefinition
    at org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:92)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at org.drools.base.evaluators.EvaluatorRegistry.addEvaluatorDefinition(EvaluatorRegistry.java:132)
    ... 12 more

我的代码是：

import com.answare.backendconnection.RESTConnection;
import com.answare.dataModel.ActionANS;
import com.answare.dataModel.CrisisContextANS;
import com.answare.db.QueriesDB;
import com.answare.settings.CTES;
import com.drools.utils.Event;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseConfiguration;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.*;
import org.drools.conf.EventProcessingOption;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;
import java.sql.SQLException;



/**
 * This is the class that launch Expert System.
 */

public class AppExpertSystem {

    StatefulKnowledgeSession ksession;
    DSS_ANS optimizerDSS_ANS;
    Event event;
    RESTConnection restConnection;


    public AppExpertSystem() {
        loadKnowledgeBase();
        optimizerDSS_ANS = new DSS_ANS(ksession);
        event = new Event();
        event.setNewEvent(true);
    }
    public AppExpertSystem(RESTConnection restConnection){
        loadKnowledgeBase();    
        event = new Event();
        event.setNewEvent(true);
        this.restConnection = restConnection;
    }



    private void loadKnowledgeBase() {
        // load up the knowledge base
        KnowledgeBase kbase;
        try {
            kbase = readKnowledgeBase();
            ksession = kbase.newStatefulKnowledgeSession();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }


    private static KnowledgeBase readKnowledgeBase() throws Exception {

        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add(ResourceFactory.newClassPathResource(CTES.RULES),
                ResourceType.DRL);
        KnowledgeBuilderErrors errors = kbuilder.getErrors();

        if (errors.size() > 0) {
            for (KnowledgeBuilderError error : errors) {
                System.err.println(error);
            }
            throw new IllegalArgumentException("Could not parse knowledge.");
        }
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
        KnowledgeBaseConfiguration config = KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
        config.setOption(EventProcessingOption.STREAM );

        return kbase;
    }


    public String executeMessage(CrisisContextANS crisisContext) {
        try {
            storeInDatabaseCrisis(crisisContext,true);
            ksession.setGlobal("optimizerDSS", optimizerDSS_ANS);
            ksession.insert(crisisContext);
            this.event.setType("CrisisContextANS");
            ksession.insert(this.event);
            int num = ksession.fireAllRules();
            if (num != 0) {
                this.event.setNewEvent(false);
                return ("Run OK from Expert System");
            }
            return ("");
        } catch (Throwable t) {
            t.printStackTrace();
            return ("Run NOT OK Expert System");
        }
    }
}

并且例外是在方法readKnowledgeBase()，在行

KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();

我唯一要做的就是调用 AppExpertSystem 构造函数:( 有什么想法吗？

谢谢！

【问题讨论】：

  • 要么您没有正确地将 JAR 添加到 CLASSPATH 中，要么版本不正确并且该方法签名不再可用。
  • @duffymo 方法签名？哪种方法？

标签： java drools


【解决方案1】：

此类已从 5.5.0.Final 发行版中消失。它存在于 5.3.0 和 5.4.0（jar：drools-core.jar）中，大概也更早。

org.drools.base 和 ...评估器不是 5.3 和 5.4 中稳定 API 的一部分，因此使用它是有风险的。

如果您发布您的代码是如何使用该类的，s.o.可能会想办法解决这个问题。

类 org.drools.base.evaluators.EqualityEvaluatorsDefinition 通常通过包含一行配置到构建器中

drools.evaluator.equality = org.drools.base.evaluators.EqualityEvaluatorsDefinition

在工作目录中的文件“drools.packagebuilder.conf”中，您的主目录或某些 jar 的 META-INF drools.default.packagebuilder.conf，或系统属性“drools.packagebuilder”指向的文件中.conf”。

【讨论】：

  • 那么，我需要做什么？删除drools-core.jar？
  • 这无济于事。您的代码引用了一个不再存在的包。
  • 您确定 5.4（或更早版本）和 5.5 的 jar 没有混淆吗？当您从头开始构建时，必须为构建器定义评估器，我认为不会发生这种情况。
  • 在 5.4.0 发行版中有 drools-core.jar 和 drools-core-5.4.0.Final.jar。当您尝试使用 5.5.0 构建时，请确保类路径中没有任何一个，只有这个：drools-core-5.5.0.Final.jar
  • 您的系统上是否有文件“drools.packagebuilder.conf”？在您的主目录中？您是否使用此键定义了指向文件的系统属性？这个文件上有什么？如果它包含一行drools.evaluator.equality = org.drools.base.evaluators.EqualityEvaluatorsDefinition，那么这就是“毒药”。
猜你喜欢
相关资源
最近更新 更多
热门标签
Java Python linux javascript C# Mysql Docker 算法 前端 SpringBoot Redis Vue spring .net 设计模式 .net core c++ kubernetes 数据库 机器学习 大数据 数据结构 微服务 js 人工智能 Go Android 面试 程序员 JVM 云原生 后端 ASP.net core 深度学习 CSS k8s git golang PHP devops Nginx Django React mybatis 架构 多线程 Spring Boot 云计算 LeetCode 分布式