我们使用spring-boot+drools-maven依赖项+drl文件在我们的spring-boot应用程序中实现某些业务规则。我们在7.73.0版本中使用了以下drools依赖项(drools核心、drools编译器、drools-Disionables(。在drools从7.73.0版本最终更新到8.29.0.Final之后，集成并没有受到影响。请在下面找到实现和错误跟踪。有人能帮助解决相同的吗
我的配置类
@Configuration
public class DroolsConfig {
private static final String RULES_DRL = "rules/rule-impl.drl";
private static final KieServices kieServices = KieServices.Factory.get();
@Bean
public KieContainer kieContainer() {
KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
kieFileSystem.write(ResourceFactory.newClassPathResource(RULES_DRL));
KieBuilder kb = kieServices.newKieBuilder(kieFileSystem);
kb.buildAll();
KieModule kieModule = kb.getKieModule();
return kieServices.newKieContainer(kieModule.getReleaseId());
}
}
调用类
@Autowired
private KieContainer kieContainer;
public String applyCleansingRules(String name) {
/////////
KieSession kieSession = kieContainer.newKieSession();
/////
kieSession.insert(name);
kieSession.fireAllRules(1);
kieSession.dispose();
return /////
}
错误消息：
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295) ~[spring-boot-2.7.0.jar:2.7.0]
at com.rule.engine.RuleEngineApplication.main(RuleEngineApplication.java:10) ~[classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'kieContainer' defined in class path resource [com/rule/engine/config/DroolsConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.kie.api.runtime.KieContainer]: Factory method 'kieContainer' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:486) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656) ~[spring-beans-5.3.20.jar:5.3.20]
... 20 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.kie.api.runtime.KieContainer]: Factory method 'kieContainer' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.20.jar:5.3.20]
... 33 common frames omitted
Caused by: java.lang.NullPointerException: null
at org.drools.compiler.rule.builder.PatternBuilder.buildAnalysis(PatternBuilder.java:1597) ~[drools-compiler-8.29.0.Final.jar:8.29.0.Final]
at org.drools.compiler.rule.builder.PatternBuilder.buildEval(PatternBuilder.java:1499) ~[drools-compiler-8.29.0.Final.jar:8.29.0.Final]
Trace Junit测试：
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '******Service': Unsatisfied dependency expressed through field 'kieContainer'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'kieContainer' defined in class path resource [com/rule/engine/config/DroolsConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.kie.api.runtime.KieContainer]: Factory method 'kieContainer' threw exception; nested exception is java.lang.NullPointerException
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'kieContainer' defined in class path resource [com/rule/engine/config/DroolsConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.kie.api.runtime.KieContainer]: Factory method 'kieContainer' threw exception; nested exception is java.lang.NullPointerException
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.kie.api.runtime.KieContainer]: Factory method 'kieContainer' threw exception; nested exception is java.lang.NullPointerException
Caused by: java.lang.NullPointerException
很难说。您的规则之一似乎是在eval()中使用8.29.0不再支持的内容。
您需要开始从KieBase中删除DRL或注释掉包含eval()的规则，直到找到有问题的规则为止。
从代码来看，它也可能与您正在使用的dialect有关。您是否为规则指定了明确的方言？