Managed threads are somewhat heavyweight and are associated with metadata, such as the transaction context and security context.

托管线程是重量级的，与元数据相关联，如事务上下文和安全上下文等。

youdao

This is a recipe for trouble because in some JVMs, creating a Thread is a heavyweight operation, and it's far better to reuse existing Threads than to create new ones.

这可以解决一些问题，因为在一些 JVM 中，创建 Thread 是一项重量型的操作，重用现有 Thread 比创建新线程要容易得多。

youdao