我的程序在我的 IDE (IntelliJ) 中运行良好,但出于某种原因,当我尝试创建一个 jar 文件时,当我从终端运行该程序时出现以下错误:
Exception in thread "main" java.lang.NullPointerException at org.optaplanner.core.config.score.director.ScoreDirectorFactoryConfig.buildDroolsScoreDirectorFactory(ScoreDirectorFactoryConfig.java:461)
org.optaplanner.core.config.score.director.ScoreDirectorFactoryConfig.buildScoreDirectorFactory(ScoreDirectorFactoryConfig.java:331)
org.optaplanner.core.config.solver.SolverConfig.buildSolver(SolverConfig.java:220)
org.optaplanner.core.impl.solver.AbstractSolverFactory.buildSolver(AbstractSolverFactory.java:57)
org.optaplanner.EmployeeRoster.main(EmployeeRoster.java:31)
这是我在 EmployeeRoster 中的第 31 行:
Solver solver = SolverFactory.createFromXmlResource(SOLVER_CONFIG_XML).buildSolver();
SOLVER_CONFIG_XML 是一个字符串,其中包含我的 XML 求解器配置路径, 看起来像这样
<?xml version="1.0" encoding="UTF-8"?>
<solver>
<solutionClass>org.optaplanner.solver.Roster</solutionClass>
<entityClass>org.optaplanner.domain.Assignment</entityClass>
<scoreDirectorFactory>
<scoreDrl>org/optaplanner/solver/employeeShiftsScoreRules.drl</scoreDrl>
</scoreDirectorFactory>
<localSearch>
<termination>
<secondsSpentLimit>5</secondsSpentLimit>
<bestScoreLimit>0hard/0medium/0soft</bestScoreLimit>
</termination>
<!--<termination>
<unimprovedStepCountLimit>5</unimprovedStepCountLimit>
</termination>-->
<acceptor>
<entityTabuSize>7</entityTabuSize>
</acceptor>
<forager>
<acceptedCountLimit>1000</acceptedCountLimit>
</forager>
</localSearch>
</solver>
如果相关的话,这里还有我的 pom.xml 文件:
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.btrg.dfb</groupId>
<artifactId>optaplanner</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.optaplanner</groupId>
<artifactId>optaplanner-core</artifactId>
<version>7.3.0.Final</version>
</dependency>
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.8</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>com.jolira</groupId>
<artifactId>onejar-maven-plugin</artifactId>
<version>1.4.4</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>org.avalin.optaplanner.EmployeeRoster</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-my-jar-with-dependencies</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>com.jolira</groupId>
<artifactId>onejar-maven-plugin</artifactId>
<version>1.4.4</version>
<executions>
<execution>
<goals>
<goal>one-jar</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
我可能做错了什么?
最佳答案
对我来说,问题必须处理我想如何运行 jar (java -jar),以及我如何构建 jar。当我从 6.4.0 升级到 optaplanner-core/7.4.1 时出现 NullPointerException。当我还在使用 6.4.0 时,这个问题没有出现。
异常(exception):
java.lang.NullPointerException at org.kie.internal.io.ResourceFactory.newByteArrayResource(ResourceFactory.java:66) at org.drools.compiler.kie.builder.impl.AbstractKieModule.getResource(AbstractKieModule.java:299) at org.drools.compiler.kie.builder.impl.AbstractKieModule.addResourceToCompiler(AbstractKieModule.java:264) at org.drools.compiler.kie.builder.impl.AbstractKieModule.addResourceToCompiler(AbstractKieModule.java:259) at org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:243) at org.drools.compiler.kie.builder.impl.AbstractKieProject.verify(AbstractKieProject.java:74) at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject(KieBuilderImpl.java:250) at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:218) at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:176) at org.optaplanner.core.config.score.director.ScoreDirectorFactoryConfig.buildDroolsScoreDirectorFactory(ScoreDirectorFactoryConfig.java:503)
以下是我为解决 NullPointerException 并让应用程序运行而采取的临时解决方法。
- 使用 IntelliJ 的 gradle 构建一个包含所有依赖项的大 jar。
- 例如,将 jar 解压到 unzippedJar/ 目录。
- 修改unzippedJar/META-INF/kie.conf
- 重新打开文件。
- 使用 java 运行 jar。
第 1 步。构建 jar
dependencies {
...
compile group: 'org.optaplanner', name: 'optaplanner-core', version:'7.4.1.Final'
compile group: 'org.optaplanner', name: 'optaplanner-benchmark', version:'7.4.1.Final'
...
}
task fatJar(type: Jar) {
manifest {
attributes 'Implementation-Title': 'Self contained jar with all dependencies',
'Implementation-Version': version,
'Main-Class': 'path.to.class.with.main.method'
}
baseName = 'fatJar'
from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
with jar
}
第二步解压
unzip fatJar.jar -d unzippedJar/
第三步.修改kie.conf
“fatJar”任务扁平化了依赖关系——jar 中允许重复的文件名。这导致了四个 unzippedJar/META-INF/kie.conf 文件,只使用了其中一个。无论使用哪个 kie.conf 文件,这都是我最后的 kie.conf。
org.kie.api.internal.assembler.KieAssemblers = +org.optaplanner.core.impl.solver.kie.KieSolverAssemblerService
org.kie.api.internal.assembler.KieAssemblers = org.kie.internal.services.KieAssemblersImpl
org.kie.api.internal.runtime.KieRuntimes = org.kie.internal.services.KieRuntimesImpl
org.kie.api.internal.weaver.KieWeavers = org.kie.internal.services.KieWeaversImpl
org.kie.api.internal.runtime.beliefs.KieBeliefs = org.kie.internal.services.KieBeliefsImpl
org.kie.api.io.KieResources = org.drools.core.io.impl.ResourceFactoryServiceImpl
org.kie.api.marshalling.KieMarshallers = org.drools.core.marshalling.impl.MarshallerProviderImpl
org.kie.api.concurrent.KieExecutors = org.drools.core.concurrent.ExecutorProviderImpl
org.kie.api.KieServices = org.drools.compiler.kie.builder.impl.KieServicesImpl
org.kie.internal.builder.KnowledgeBuilderFactoryService = org.drools.compiler.builder.impl.KnowledgeBuilderFactoryServiceImpl
步骤 4. Rejar
无论出于何种原因,指定 MANIFEST.MF 文件对我没有任何帮助,因此我将其省略。
jar cf rejard.jar .
第 5 步。运行 jar
java -cp rejard.jar path.to.class.with.main.method
关于java - Optaplanner - 创建 jar 文件时出现 NullPointerException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46199392/