java - KieBuilderImpl.buildAll 因 NullPointerException 失败

Question

很多天来我一直在努力解决下面的NullPointerException。我是否缺少任何配置？

Caused by: java.lang.NullPointerException
        at org.kie.internal.io.ResourceFactory.newByteArrayResource(ResourceFactory.java:66)
        at org.drools.compiler.kie.builder.impl.AbstractKieModule.getResource(AbstractKieModule.java:303)
        at org.drools.compiler.kie.builder.impl.AbstractKieModule.addResourceToCompiler(AbstractKieModule.java:268)
        at org.drools.compiler.kie.builder.impl.AbstractKieModule.addResourceToCompiler(AbstractKieModule.java:263)
        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:353)
        at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:265)
        at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:209)

以下是我正在执行的步骤，程序在 kieBuilder.buildAll() 行失败:

           KieServices kieServices = KieServices.Factory.get();
            KieResources kieResources = kieServices.getResources();
            KieFileSystem kfs = kieServices.newKieFileSystem();
            KieRepository kr = kieServices.getRepository();
 Resource res = kieResources.newByteArrayResource(drlFile.getBytes()).setResourceType(ResourceType.DRL).setSourcePath("test.drl");

kfs.write(res);

 KieBuilder kieBuilder = kieServices.newKieBuilder(kfs,this.getClass().getClassLoader());
            kieBuilder.buildAll();

Maven 依赖:

   <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-core</artifactId>
        <version>7.7.0.Final</version>
    </dependency>

    <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-compiler</artifactId>
        <version>7.7.0.Final</version>
    </dependency>

谢谢!感谢您的帮助。

Answer 1

我遇到了同样的错误，这是由于某些 KieServices 未初始化。服务是从 kie.conf 属性文件中读取的，上面的错误是由于 ResourceFactory Service 没有初始化，添加 "org.kie.api.io.KieResources = org.drools.core.io.impl.ResourceFactoryServiceImpl" 在您的 kie.conf 文件中初始化此服务。