ThreadPoolExecutor创建线程池启动项目报错问题

最新推荐文章于 2025-06-16 23:02:40 发布

打不死的小强lee

最新推荐文章于 2025-06-16 23:02:40 发布

阅读量1.6k

点赞数

CC 4.0 BY-SA版权

分类专栏： java线程 java并发文章标签： java 开发语言

本文链接：https://blog.youkuaiyun.com/wenqiangluyao/article/details/125768360

java线程同时被 2 个专栏收录

4 篇文章

订阅专栏

java并发

4 篇文章

订阅专栏

本文探讨了如何在Spring Boot项目中使用ThreadPoolExecutor时避免因参数配置不当导致的IllegalArgumentException，重点在于理解corePoolSize和maximumPoolSize的关系，并提供了一种修正方法。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

ThreadPoolExecutor创建线程，如下代码：

ThreadPoolExecutor threadPoolExecutor =
            new ThreadPoolExecutor(Runtime.getRuntime().availableProcessors() + 1, 20, 60, TimeUnit.SECONDS, new LinkedBlockingQueue<>(100), new ThreadPoolExecutor.CallerRunsPolicy());

启动项目时，报错如下：

Constructor threw exception; nested exception is java.lang.IllegalArgumentException
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:154) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1147) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
	... 37 common frames omitted
Caused by: java.lang.IllegalArgumentException: null
	at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1314) [na:1.8.0_162]
	at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1272) [na:1.8.0_162]

原因分析：corePoolSize必须小于等于maximumPoolSize，而Runtime.getRuntime().availableProcessors() + 1有可能大于20，这时就会抛出IllegalArgumentException，这可以在源码中看到，如下图：

public ThreadPoolExecutor(int corePoolSize,
                              int maximumPoolSize,
                              long keepAliveTime,
                              TimeUnit unit,
                              BlockingQueue<Runnable> workQueue,
                              ThreadFactory threadFactory,
                              RejectedExecutionHandler handler) {
        if (corePoolSize < 0 ||
            maximumPoolSize <= 0 ||
            maximumPoolSize < corePoolSize ||
            keepAliveTime < 0)
            throw new IllegalArgumentException();
        if (workQueue == null || threadFactory == null || handler == null)
            throw new NullPointerException();
        this.corePoolSize = corePoolSize;
        this.maximumPoolSize = maximumPoolSize;
        this.workQueue = workQueue;
        this.keepAliveTime = unit.toNanos(keepAliveTime);
        this.threadFactory = threadFactory;
        this.handler = handler;
    }

解决。只需要保证corePoolSize总是<=maximumPoolSize即可，如：

ThreadPoolExecutor threadPoolExecutor =
            new ThreadPoolExecutor(Runtime.getRuntime().availableProcessors() + 1, Runtime.getRuntime().availableProcessors()*2, 60, TimeUnit.SECONDS, new LinkedBlockingQueue<>(100), new ThreadPoolExecutor.CallerRunsPolicy());