Optaplanner项目的非法参数异常，解算器配置在类加载器中不作为类路径资源存在

Question

我得到一个错误时运行我的SpringBoot应用程序在我的求解器类。我试图从资源文件夹中包含的xml资源创建求解器工厂，就像OptaPlanner的员工名册示例一样，但我得到了一个非法参数异常，我不知道为什么。我试图将xml文件移动到与求解器类相同的文件夹中，但出现了相同的错误。我不知道为什么当我遵循OptaPlanner的员工名册示例代码时抛出异常？

下面是我的解算器类的代码：

package com.schedule.demo.solver;

import com.schedule.demo.domain.Roster;
import com.schedule.demo.service.RosterService;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CountDownLatch;

import org.optaplanner.core.api.solver.Solver;
import org.optaplanner.core.api.solver.SolverFactory;
import org.optaplanner.core.impl.score.director.ScoreDirector;
import org.optaplanner.core.impl.score.director.ScoreDirectorFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;
import org.springframework.web.context.annotation.ApplicationScope;


@ApplicationScope
@Component
public class ScheduleSolverManager implements ApplicationRunner {

    public static final String SOLVER_CONFIG = "com/schedule/demo/service/solver/scheduleSolverConfig.xml";

    protected final transient Logger logger = LoggerFactory.getLogger(getClass());

    private SolverFactory<Roster> rosterSolverFactory;
    private ScoreDirectorFactory<Roster> rosterScoreDirectorFactory;

    private ThreadPoolTaskExecutor taskExecutor;

    private ConcurrentMap<Integer, Solver<Roster>> deptIdToSolverMap = new ConcurrentHashMap<>();

    private RosterService rosterService;

    public ScheduleSolverManager(ThreadPoolTaskExecutor taskExecutor, RosterService rosterService){
        this.taskExecutor = taskExecutor;
        this.rosterService = rosterService;
    }

    @Override
    public void run(ApplicationArguments args) throws Exception {
        setupRosterSolverFactory();
    }

    private void setupRosterSolverFactory() {
        rosterSolverFactory = SolverFactory.createFromXmlResource("com/schedule/demo/service/solver/scheduleSolverConfig.xml", ScheduleSolverManager.class.getClassLoader());
        rosterScoreDirectorFactory = rosterSolverFactory.buildSolver().getScoreDirectorFactory();
    }

    public CountDownLatch solve(Integer deptID){
        final CountDownLatch solvingEndedLatch = new CountDownLatch(1);
        try{
            taskExecutor.execute(()->{
                Solver<Roster> rosterSolver = rosterSolverFactory.buildSolver();
                deptIdToSolverMap.put(deptID, rosterSolver);
                rosterSolver.addEventListener(event -> {
                    if(event.isEveryProblemFactChangeProcessed()){
                        logger.info("New best solution found for deptId ({}).", deptID);
                        Roster newRoster = event.getNewBestSolution();
                        rosterService.updateShiftsOfRoster(newRoster);
                    }
                });
                Roster roster = rosterService.buildRoster(deptID);
                try {
                    rosterSolver.solve(roster);
                    solvingEndedLatch.countDown();
                }   finally {
                    deptIdToSolverMap.remove(deptID);
                }
            });
        } catch (Throwable e) {
            logger.error("Error solving for deptId (" + deptID + ").", e);
        }
        return solvingEndedLatch;
    }

    public Roster getRoster(final Integer deptId){
        Solver<Roster> rosterSolver = deptIdToSolverMap.get(deptId);
        return rosterSolver == null ? null : rosterSolver.getBestSolution();
    }

    public ScoreDirector<Roster> getScoreDirector() {
        return rosterScoreDirectorFactory.buildScoreDirector();
    }
}

运行时的错误如下所示：

Caused by: java.lang.IllegalArgumentException: The solverConfigResource (com/schedule/demo/service/solver/scheduleSolverConfig.xml) does not exist as a classpath resource in the classLoader (org.springframework.boot.devtools.restart.classloader.RestartClassLoader@2302b8ed).

Answer 1

为了能够将其作为类路径资源加载，您必须将求解器配置XML放在src/main/Resources下。

因此，如果使用资源名com/schedule/demo/service/solver/scheduleSolverConfig.xml加载它，那么文件必须位于

src/main/resources/com/schedule/demo/service/solver/scheduleSolverConfig.xml

Answer 2

使用optaplannerSpring启动启动器。它大大简化了Spring集成。

导游：https://github.com/spring-guides/getting-started-guides/pull/126

视频：https://www.youtube.com/watch?v=U2N02ReT9CI

如果您不想使用启动程序，这段代码可能会修复它：SolverFactory.createFromXmlResources（"com/计划/演示/服务/解决方案/时间表SolverConfig.xml"，Roster.class.getClassLoader（））；（使用名册的类加载器）。