JHipster是一个快速生成，开发，&部署现代web应用程序& &;使用Spring-boot框架的微服务架构。Jhipster有"直走"。脚本部署到Google云上。
Optaplanner是一个人工智能库，帮助解决计划和调度问题。
我的目标是使用Jhipster快速开发一个借助optaplanner解决特定问题的平台，最后将代码部署在Google kuberate上。我最终通过合并Optaplanner和Jhipster的示例代码得出了一个解决方案。
如下输出所示，它在本机上运行良好。安装Jhipster后:
jhipster
mvn package -Pprod jib:dockerBuild
java -jar target/jhipster-0.0.1-SNAPSHOT.jar
██╗██╗██╗████████╗███████╗██████╗████████╗████████╗███████╗██║██║██║╚══██╔══╝██╔═══██╗██╔════╝╚══██╔══╝██╔═════╝██╔═══██╗██║████████║██║███████╔╝╚█████╗██║██████╗███████╔╝██╗██║██╔═══██║██║██╔════╝╚═══██╗██║██╔═══╝██╔══██║╚██████╔╝██║██║████████╗██║██████╔╝██║████████╗██║╚██╗╚═════╝╚═╝╚═╝╚═══════╝╚═╝╚═════╝╚═╝╚═══════╝╚═╝╚═╝
:: JHipster 🤓 :: Running Spring Boot 2.5.4 ::
:: https://www.jhipster.tech ::
23:14:22.340 INFO [main ] The following profiles are active: prod
23:14:25.183 INFO [main ] Web application configuration, using profiles: prod
23:14:25.184 INFO [main ] Web application fully configured
23:14:31.135 DEBUG [main ] Identified candidate component class: URL [jar:file:/home/parfait/Programming/JavaScript/Jhipster/target/jhipster-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/com/mycompany/myapp/domain/TimeTable.class]
23:14:31.145 DEBUG [main ] Identified candidate component class: URL [jar:file:/home/parfait/Programming/JavaScript/Jhipster/target/jhipster-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/com/mycompany/myapp/domain/Lesson.class]
23:14:35.403 INFO [main ] JBoss Threads version 3.1.0.Final
23:14:35.477 INFO [main ] Started JhipsterApp in 14.484 seconds (JVM running for 15.042)
23:14:35.479 INFO [main ]
----------------------------------------------------------
Application 'Jhipster' is running! Access URLs:
Local: http://localhost:8080/
External: http://127.0.1.1:8080/
Profile(s): [prod]
----------------------------------------------------------
但是当我执行脚本在Google kubertes上部署相同的代码时，我面临以下错误:
jhipster k8s
./mvnw clean compile jib:build
./mvnw -ntp -Pprod jib:build -Djib.to.image=gcr.io/jhipster17/jhipster
bash kubectl-apply.sh -f
Kubernetes日志输出:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'timeTableResource' defined in file
[/app/classes/com/mycompany/myapp/web/rest/TimeTableResource.class]: Unsatisfied dependency expressed through constructor parameter 1;
nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'solverManager' defined in class path
resource [org/optaplanner/spring/boot/autoconfigure/OptaPlannerAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception
is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.optaplanner.core.api.solver.SolverManager]: Factory method 'solverManager'
threw exception; nested exception is java.lang.NullPointerException at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:229)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1354)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1204)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338)
at com.mycompany.myapp.JhipsterApp.main(JhipsterApp.java:69) Caused by: org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'solverManager' defined in class path resource [org/optaplanner/spring/boot/autoconfigure/OptaPlannerAutoConfiguration.class]:
Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException:
Failed to instantiate [org.optaplanner.core.api.solver.SolverManager]: Factory method 'solverManager' threw exception;
nested exception is java.lang.NullPointerException at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ...
17 common frames omitted Caused by: org.springframework.beans.BeanInstantiationException:
Failed to instantiate [org.optaplanner.core.api.solver.SolverManager]: Factory method 'solverManager' threw exception; nested exception is java.lang.NullPointerException at
org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ... 31 common frames omitted Caused by:
java.lang.NullPointerException: null at java.compiler@11.0.12/javax.tools.ToolProvider.lambda$matches$0(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Native Method) at java.compiler@11.0.12/javax.tools.ToolProvider.matches(Unknown Source)
at java.compiler@11.0.12/javax.tools.ToolProvider.getSystemTool(Unknown Source)
at java.compiler@11.0.12/javax.tools.ToolProvider.getSystemJavaCompiler(Unknown Source)
at org.kie.memorycompiler.jdknative.NativeJavaCompiler.compile(NativeJavaCompiler.java:73)
at org.kie.memorycompiler.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:41)
at org.kie.memorycompiler.KieMemoryCompiler.compileNoLoad(KieMemoryCompiler.java:129)
at org.kie.memorycompiler.KieMemoryCompiler.compileNoLoad(KieMemoryCompiler.java:101)
at org.kie.memorycompiler.KieMemoryCompiler.compile(KieMemoryCompiler.java:53)
at org.kie.memorycompiler.KieMemoryCompiler.compile(KieMemoryCompiler.java:39)
at org.drools.ancompiler.KieBaseUpdaterANC.inMemoryUpdate(KieBaseUpdaterANC.java:66)
at org.drools.ancompiler.KieBaseUpdaterANC.run(KieBaseUpdaterANC.java:52)
at org.drools.ancompiler.KieBaseUpdaterANC.generateAndSetInMemoryANC(KieBaseUpdaterANC.java:99)
at org.optaplanner.core.impl.score.director.stream.DroolsConstraintStreamScoreDirectorFactory.buildKieBaseFromModel(DroolsConstraintStreamScoreDirectorFactory.java:115)
at org.optaplanner.core.impl.score.director.stream.DroolsConstraintStreamScoreDirectorFactory.buildKieBase(DroolsConstraintStreamScoreDirectorFactory.java:104)
at org.optaplanner.core.impl.score.director.stream.DroolsConstraintStreamScoreDirectorFactory.<init>(DroolsConstraintStreamScoreDirectorFactory.java:71)
at org.optaplanner.core.impl.score.director.ScoreDirectorFactoryFactory.buildConstraintStreamScoreDirectorFactory(ScoreDirectorFactoryFactory.java:223)
at org.optaplanner.core.impl.score.director.ScoreDirectorFactoryFactory.decideMultipleScoreDirectorFactories(ScoreDirectorFactoryFactory.java:103)
at org.optaplanner.core.impl.score.director.ScoreDirectorFactoryFactory.buildScoreDirectorFactory(ScoreDirectorFactoryFactory.java:71)
at org.optaplanner.core.impl.solver.DefaultSolverFactory.buildScoreDirectorFactory(DefaultSolverFactory.java:116)
at org.optaplanner.core.impl.solver.DefaultSolverFactory.buildSolver(DefaultSolverFactory.java:83)
at org.optaplanner.core.impl.solver.DefaultSolverManager.validateSolverFactory(DefaultSolverManager.java:68)
at org.optaplanner.core.impl.solver.DefaultSolverManager.<init>(DefaultSolverManager.java:57)
at org.optaplanner.core.api.solver.SolverManager.create(SolverManager.java:111)
at org.optaplanner.spring.boot.autoconfigure.OptaPlannerAutoConfiguration.solverManager(OptaPlannerAutoConfiguration.java:98)
at org.optaplanner.spring.boot.autoconfigure.OptaPlannerAutoConfiguration$$EnhancerBySpringCGLIB$$2e4db969.CGLIB$solverManager$3(<generated>)
at org.optaplanner.spring.boot.autoconfigure.OptaPlannerAutoConfiguration$$EnhancerBySpringCGLIB$$2e4db969$$FastClassBySpringCGLIB$$277961ad.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331)
at org.optaplanner.spring.boot.autoconfigure.OptaPlannerAutoConfiguration$$EnhancerBySpringCGLIB$$2e4db969.solverManager(<generated>)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ... 32 common frames omitted
这是基于Jhipster示例代码的SolverManager bean注入代码:
@RestController
@RequestMapping("/api")
public class TimeTableResource {
private TimeTableRepository timeTableRepository;
private SolverManager<TimeTable, Long> solverManager;
public TimeTableResource(TimeTableRepository timeTableRepository, SolverManager<TimeTable, Long> solverManager) {
this.timeTableRepository = timeTableRepository;
this.solverManager = solverManager;
}
/**
* {@code POST /solve}
*/
@PostMapping("/solve")
public void solve(TimeTableRepository timeTableRepository, SolverManager<TimeTable, Long> solverManager) throws URISyntaxException {
log.debug("REST request to solve ");
solverManager.solveAndListen(TimeTableRepository.SINGLETON_TIME_TABLE_ID, timeTableRepository::findById, timeTableRepository::save);
}
}
完整的代码可以在这里找到。我不明白为什么这种"不满足的依赖"。在gke上部署时发生，而在本地机器上没有此错误，在gce上也没有。
有人能帮我解决这个问题吗?有一个NullPointerException潜伏在堆栈跟踪中:
java.lang.NullPointerException: null at java.compiler@11.0.12/javax.tools.ToolProvider.lambda$matches$0(Unknown Source)
从来没有见过这个异常，我可以做一个有根据的猜测:可能是你的机器上没有Java编译器?请安装一个完整的JDK(包括javac和java)，这个问题可能会消失。
这样做的原因是约束流——为了生成约束代码——需要将一些Java类编译成字节码。如果没有javac，这是不可能的。