Calling matlab jar on linux using java program Open parallel pool problem

My environment: linux, MCR (2017b) What I'm trying to achieve is When my Java program starts, I will call a jar to open the parallel pool; during the time my Java program is running, I will call other jars that will contain parfor. The problem I'm having The parallel pool is successfully enabled at program startup, but when I call the other jar, the program breaks! I'm not sure if this is possible or if there is a conflict between this.