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This paper provides an in-depth analysis of specifying custom thread pools for Java 8 parallel streams. By examining the workings of ForkJoinPool, it details how to isolate parallel stream execution environments through task submission to custom ForkJoinPools, preventing performance issues caused by shared thread pools. With code examples, the article explains the implementation rationale and its practical value in multi-threaded server applications, while also discussing supplementary approaches like system property configuration.