我已经将我的OptaPlanner项目导出到一个jar中。运行我的jar时，出现以下错误：
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.kie.api.internal.utils.ServiceRegistry.getInstance(ServiceRegistry.java:27)
at org.kie.api.KieServices$Factory$LazyHolder.<clinit>(KieServices.java:341)
at org.kie.api.KieServices$Factory.get(KieServices.java:348)
at org.optaplanner.core.config.score.director.ScoreDirectorFactoryConfig.buildDroolsScoreDirectorFactory(ScoreDirectorFactoryConfig.java:639)
at org.optaplanner.core.config.score.director.ScoreDirectorFactoryConfig.buildScoreDirectorFactory(ScoreDirectorFactoryConfig.java:463)
at org.optaplanner.core.config.solver.SolverConfig.buildScoreDirectorFactory(SolverConfig.java:606)
at org.optaplanner.core.config.solver.SolverConfig.buildSolver(SolverConfig.java:514)
at org.optaplanner.core.impl.solver.DefaultSolverFactory.buildSolver(DefaultSolverFactory.java:49)
at org.optaplanner.examples.common.app.CommonApp.createSolutionBusiness(CommonApp.java:124)
at org.optaplanner.examples.common.app.CommonApp.init(CommonApp.java:114)
at org.optaplanner.examples.common.app.CommonApp.init(CommonApp.java:110)
at org.optaplanner.examples.projectjobscheduling.app.ProjectJobSchedulingApp.main(ProjectJobSchedulingApp.java:36)
Caused by: java.lang.RuntimeException: Child services [org.kie.api.internal.assembler.KieAssemblers] have no parent
at org.kie.api.internal.utils.ServiceDiscoveryImpl.buildMap(ServiceDiscoveryImpl.java:197)
at org.kie.api.internal.utils.ServiceDiscoveryImpl.getServices(ServiceDiscoveryImpl.java:95)
at org.kie.api.internal.utils.ServiceRegistryImpl.<init>(ServiceRegistryImpl.java:36)
at org.kie.api.internal.utils.ServiceRegistryImpl$LazyHolder.<clinit>(ServiceRegistryImpl.java:32)
... 12 more
[我看到其他人也有同样的问题，建议他们将以下代码添加到他们的pom.xml文件中：
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/kie.conf</resource>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
对我来说，这并不能解决我的问题，在对pom.xml文件进行了所有不同的调整之后，我发现我对解决此问题有些绝望。
我的原始pom.xml文件是：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.optaplanner</groupId>
<artifactId>optaplanner</artifactId>
<version>7.29.0.Final</version>
</parent>
<artifactId>optaplanner-examples</artifactId>
<name>OptaPlanner examples</name>
<description>
OptaPlanner solves planning problems.
This lightweight, embeddable planning engine implements powerful and scalable algorithms
to optimize business resource scheduling and planning.
This module contains the examples which demonstrate how to use it in a normal Java application.
</description>
<url>https://www.optaplanner.org</url>
<properties>
<java.module.name>org.optaplanner.examples</java.module.name>
</properties>
<repositories>
<!-- Included so the examples sources in the distribution zip build out-of-the-box with maven -->
<repository>
<id>jboss-public-repository-group</id>
<name>JBoss Public Repository Group</name>
<url>https://repository.jboss.org/nexus/content/groups/public/</url>
<layout>default</layout>
<releases>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>daily</updatePolicy>
</snapshots>
</repository>
</repositories>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<forkCount>0.5C</forkCount>
<systemPropertyVariables>
<java.awt.headless>true</java.awt.headless>
</systemPropertyVariables>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<!-- WARNING: This configuration must be run with "mvn exec:java" not "mvn exec:exec". -->
<!-- It is impossible to write a configuration that is compatible with both exec:java and exec:exec -->
<configuration>
<mainClass>org.optaplanner.examples.app.OptaPlannerExamplesApp</mainClass>
<arguments>
<argument>-Xms256m</argument>
<!-- Most examples run (potentially slower) with max heap of 128 MB (so -Xmx128m), but 1 example's dataset requires 1.5 GB -->
<argument>-Xmx1536m</argument>
<argument>-server</argument>
</arguments>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
<dependencies>
<!-- Internal dependencies -->
<dependency>
<groupId>org.optaplanner</groupId>
<artifactId>optaplanner-core</artifactId>
</dependency>
<dependency>
<groupId>org.optaplanner</groupId>
<artifactId>optaplanner-persistence-common</artifactId>
</dependency>
<dependency><!-- Most examples use the XStream integration -->
<groupId>org.optaplanner</groupId>
<artifactId>optaplanner-persistence-xstream</artifactId>
</dependency>
<dependency><!-- TODO add examples that use the JAXB integration -->
<groupId>org.optaplanner</groupId>
<artifactId>optaplanner-persistence-jaxb</artifactId>
</dependency>
<dependency><!-- TODO add examples that use the jackson integration -->
<groupId>org.optaplanner</groupId>
<artifactId>optaplanner-persistence-jackson</artifactId>
</dependency>
<dependency>
<groupId>org.optaplanner</groupId>
<artifactId>optaplanner-benchmark</artifactId>
</dependency>
<dependency>
<groupId>org.optaplanner</groupId>
<artifactId>optaplanner-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-api</artifactId>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-decisiontables</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-canonical-model</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-model-compiler</artifactId>
<scope>runtime</scope>
</dependency>
<!-- External dependencies -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
</dependency>
<dependency>
<groupId>org.jfree</groupId>
<artifactId>jfreechart</artifactId>
</dependency>
<!-- Common utils -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
</dependency>
<!-- Logging -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<scope>runtime</scope>
</dependency>
<!-- XML -->
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
</dependency>
<!-- Examples only dependencies. -->
<!--
WARNING: every examples only dependency must be properly dealt with in
optaplanner-distribution/src/main/assembly/assembly-optaplanner.xml
-->
<!-- Converters -->
<dependency>
<groupId>org.jdom</groupId>
<artifactId>jdom</artifactId>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<exclusions>
<exclusion>
<!-- Collides with 'javax.xml.stream:stax-api' brought in by 'org.drools:drools-decisiontables'. -->
<groupId>stax</groupId>
<artifactId>stax-api</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>javax.json</artifactId>
</dependency>
</dependencies>
</project>
我的kie.conf文件的内容是：
org.kie.api.internal.assembler.KieAssemblers = +org.optaplanner.core.impl.solver.kie.KieSolverAssemblerService
有人知道如何解决此问题吗？