I am observing swap memory issue in our tomcat servers which is installed in linux machines and when tried to collect heap dump, got this while analyzing heap dump.
16 instances of "io.netty.buffer.PoolArena$HeapArena", loaded by "org.apache.catalina.loader.ParallelWebappClassLoader @ 0x7f07994aeb58" occupy 201,697,824 (15.40%) bytes.
Have seen in this blog Memory accumulated in netty PoolChunk that Adding -Dio.netty.allocator.type=unpooled
showed significant reduction in the memory. Where do we need to add this property in our tomcat servers?