createAgent() Jade 中的非法访问异常

Question

当我尝试在我的简单程序中创建代理时出现异常。 有我的代码： DefaultAgent.java：

package ru.spbu.mas;
import jade.core.Agent;
import jade.core.behaviours.TickerBehaviour;
import java.util.concurrent.TimeUnit;
public class DefaultAgent extends Agent {
 DefaultAgent() {
        super();
   }
@Override
    protected void setup() {
        int id = Integer.parseInt(getAID().getLocalName());
        System.out.println("Agent #" + id);
        addBehaviour(new TickerBehaviour(this, TimeUnit.SECONDS.toMillis(1)) {
            @Override
            protected void onTick() {
                    stop();
            }
        });
    }
}

MainController.java（我隐藏了一些导入。认为问题不在其中）：

    class MainController {
        private static final int numberOfAgents = 5;
        private AgentController[] agents = new AgentController[numberOfAgents];
        private int steps = 10;
        void initAgents() {
            Runtime rt = Runtime.instance();
            Profile p = new ProfileImpl();
            p.setParameter(Profile.MAIN_HOST, "localhost");
            p.setParameter(Profile.MAIN_PORT, "10098");
            p.setParameter(Profile.GUI, "true");
            ContainerController cc = rt.createMainContainer(p);
            try {
                for(int i = 1; i <= MainController.numberOfAgents; i++) {
                    //Exception in that string of code
                    AgentController agent = cc.createNewAgent(Integer.toString(i), "ru.spbu.mas.DefaultAgent", null);
                    agents[i - 1] = agent;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        void startAgents() {
            try {
                for(int i = 1; i <= MainController.numberOfAgents; i++) {
                    agents[i].start();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
}

这是我的项目层次结构： project hierarchy

这是我的 Gradle 依赖项：

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
    implementation files('C:\\Users\\chote\\Desktop\\JADE-bin-4.5.0\\jade\\lib\\jade.jar')
    compileOnly 'org.projectlombok:lombok:1.18.10'
    annotationProcessor 'org.projectlombok:lombok:1.18.10'
}

这里是App.java：

package ru.spbu.mas;

public class App {
    public static void main(String[] args) {
        MainController mc = new MainController();
        mc.initAgents();
        mc.startAgents();
    }
}

这里异常的回溯：

jade.core.IMTPException: Illegal access exception in createAgent() - Caused by:  Class jade.core.management.AgentManagementService$CommandTargetSink can not access a member of class ru.spbu.mas.DefaultAgent with modifiers ""
    at jade.core.management.AgentManagementService$CommandTargetSink.createAgent(AgentManagementService.java:630)
    at jade.core.management.AgentManagementService$CommandTargetSink.handleRequestCreate(AgentManagementService.java:533)
    at jade.core.management.AgentManagementService$CommandTargetSink.consume(AgentManagementService.java:488)
    at jade.core.CommandProcessor$SinksFilter.accept(CommandProcessor.java:253)
    at jade.core.Filter.filter(Filter.java:89)
    at jade.core.Filter.filter(Filter.java:90)
    at jade.core.Filter.filter(Filter.java:90)
    at jade.core.CommandProcessor.processIncoming(CommandProcessor.java:229)
    at jade.core.BaseNode.serveVerticalCommand(BaseNode.java:163)
    at jade.core.BaseNode.serveHorizontalCommand(BaseNode.java:111)
    at jade.imtp.leap.NodeLEAP.accept(NodeLEAP.java:60)
    at jade.core.management.AgentManagementProxy.createAgent(AgentManagementProxy.java:67)
    at jade.core.AgentContainerImpl$1.createAgent(AgentContainerImpl.java:176)
    at jade.wrapper.ContainerController.createNewAgent(ContainerController.java:135)
    at ru.spbu.mas.MainController.initAgents(MainController.java:36)
    at ru.spbu.mas.App.main(App.java:6)
Nested Exception:
java.lang.IllegalAccessException: Class jade.core.management.AgentManagementService$CommandTargetSink can not access a member of class ru.spbu.mas.DefaultAgent with modifiers ""
    at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:102)
    at java.lang.Class.newInstance(Class.java:436)
    at jade.core.management.AgentManagementService$CommandTargetSink.createAgent(AgentManagementService.java:612)
    at jade.core.management.AgentManagementService$CommandTargetSink.handleRequestCreate(AgentManagementService.java:533)
    at jade.core.management.AgentManagementService$CommandTargetSink.consume(AgentManagementService.java:488)
    at jade.core.CommandProcessor$SinksFilter.accept(CommandProcessor.java:253)
    at jade.core.Filter.filter(Filter.java:89)
    at jade.core.Filter.filter(Filter.java:90)
    at jade.core.Filter.filter(Filter.java:90)
    at jade.core.CommandProcessor.processIncoming(CommandProcessor.java:229)
    at jade.core.BaseNode.serveVerticalCommand(BaseNode.java:163)
    at jade.core.BaseNode.serveHorizontalCommand(BaseNode.java:111)
    at jade.imtp.leap.NodeLEAP.accept(NodeLEAP.java:60)
    at jade.core.management.AgentManagementProxy.createAgent(AgentManagementProxy.java:67)
    at jade.core.AgentContainerImpl$1.createAgent(AgentContainerImpl.java:176)
    at jade.wrapper.ContainerController.createNewAgent(ContainerController.java:135)
    at ru.spbu.mas.MainController.initAgents(MainController.java:36)
    at ru.spbu.mas.App.main(App.java:6)
jade.wrapper.StaleProxyException: Illegal access exception in createAgent() - Caused by:  Class jade.core.management.AgentManagementService$CommandTargetSink can not access a member of class ru.spbu.mas.DefaultAgent with modifiers ""
    at jade.wrapper.ContainerController.createNewAgent(ContainerController.java:140)
    at ru.spbu.mas.MainController.initAgents(MainController.java:36)
    at ru.spbu.mas.App.main(App.java:6)
java.lang.NullPointerException
    at ru.spbu.mas.MainController.startAgents(MainController.java:47)
    at ru.spbu.mas.App.main(App.java:7)

如果 DefaultAgent 没有其他字段，为什么我会遇到此异常。所有修饰符都是私有的。修饰符“”是什么意思？我该如何解决？程序的真实版本要大得多。上面的程序是通过注释大量代码得到的。

Answer 1

我建议你将 DefaultAgent 的构造函数公开。