ThreadPoolTaskExecutor初始化报IllegalArgumentException

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已于 2022-01-19 12:25:37 修改

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分类专栏： bug修复文章标签： java spring

于 2022-01-19 12:20:45 首次发布

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服务器启动时遇到ThreadPoolTaskExecutor初始化报IllegalArgumentException，原因是未获取到配置参数导致空指针异常。解决办法包括通过类注入设置参数或直接硬编码参数值。

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org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'XXX-task' defined in class path resource [.../.../config/AsyncConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [java.util.concurrent.Executor]: Factory method 'xxxTaskExecutor' threw exception; nested exception is java.lang.IllegalArgumentException
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:486)
    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.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:144)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:782)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:774)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:339)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1340)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1329)
    at com.xxx.xxxApplication.main(xxxApplication.java:17)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [java.util.concurrent.Executor]: Factory method 'xxxTaskExecutor' threw exception; nested exception is java.lang.IllegalArgumentException
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)
    ... 20 more
Caused by: java.lang.IllegalArgumentException
    at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1307)
    at org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor.initializeExecutor(ThreadPoolTaskExecutor.java:250)
    at org.springframework.scheduling.concurrent.ExecutorConfigurationSupport.initialize(ExecutorConfigurationSupport.java:186)
    at com.xxx.xxx.config.AsyncConfig.xxxTaskExecutor(AsyncConfig.java:48)
    at com.xxx.xxx.config.AsyncConfig$$EnhancerBySpringCGLIB$$734ead7f.CGLIB$xxxTaskExecutor$6(<generated>)
    at com.xxx.xxx.config.AsyncConfig$$EnhancerBySpringCGLIB$$734ead7f$$FastClassBySpringCGLIB$$3f27758e.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331)
    at ....acs.....config.AsyncConfig$$EnhancerBySpringCGLIB$$734ead7f.xxxTaskExecutor(<generated>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    ... 21 more

@Data
@Configuration
@ConfigurationProperties(prefix = "xxx.xxx")
public class AsyncConfig {

    private int corePoolSize;
    private int maxPoolSize;
    private int queueCapacity;

    // ThredPoolTaskExcutor的处理流程
    // 当池子大小小于corePoolSize，就新建线程，并处理请求
    // 当池子大小等于corePoolSize，把请求放入workQueue中，池子里的空闲线程就去workQueue中取任务并处理
    // 当workQueue放不下任务时，就新建线程入池，并处理请求，如果池子大小撑到了maximumPoolSize，就用RejectedExecutionHandler来做拒绝处理
    // 当池子的线程数大于corePoolSize时，多余的线程会等待keepAliveTime长时间，如果无请求可处理就自行销毁

    @Bean("xxx-task")
    public Executor xxxTaskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //调度器shutdown被调用时等待当前被调度的任务完成
        executor.setWaitForTasksToCompleteOnShutdown(true);
        //等待时长
        executor.setAwaitTerminationSeconds(5);
        // 最小线程数
        executor.setCorePoolSize(corePoolSize);
        // 最大线程数
        executor.setMaxPoolSize(maxPoolSize);
        // 等待队列
        executor.setQueueCapacity(Integer.MAX_VALUE);
        executor.setThreadNamePrefix("xxx-Task-");
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }
}

问题：服务器启动的时候未能获取到配置的启动参数，线程池的初始化报错，因为executor里面的值都是空的，在【executor.initialize()】代码报了一个空指针异常

解决：要么通过类注入写入参数，要么写死参数