i am quite new to spring-boot. I have a typical application that consists of a front-end, back-end and postgresql database (see below).

I deployed this app to a local openshift with one pod for each. The app worked fine but when i try though to replicate the spring-boot-backend-pods i noticed that only one of the replicas can access the database. I thought at first that this is happening due to RWO Access Mode of the postgresql volume so i changed it to shared acess(RWX) but i still having the problem.

error:

java.lang.IllegalArgumentException: Sensor type ST0001 already exists at com.foo.boo.SupplyChainController.addSensorType(SupplyChainController.kt:138) ~[classes!/:na] at com.foo.boo.SupplyChainController.initializeSupplyChain(SupplyChainController.kt:203) ~[classes!/:na] at com.foo.boo.service.SupplyChainService.instatiateSupplyChain(SupplyChainService.java:41) ~[classes!/:na] at com.foo.boo.websocket.SupplyChainSocketController.instatiateSupplyChain(SupplyChainSocketController.java:32) ~[classes!/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131] 5.0.8.RELEASE.jar!/:5.0.8.RELEASE] at org.springframework.messaging.support.ExecutorSubscribableChannel$SendTask.run(ExecutorSubscribableChannel.java:138) [spring-messaging-5.0.8.RELEASE.jar!/:5.0.8.RELEASE] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]

Does any body know whats really happening here? I can provide more info if needed.