There are couple of places in the method 'sun.jvm.hotspot.debugger.posix.elf.ELFFileParser.ELFFileImpl.ELFHeaderImpl#getELFSymbol' where `Math.ceil` called with 'int' arguments. Calling Math.ceil with integer argument is useless - it will just return the same passed value.
https://github.com/openjdk/jdk/blob/156f0b4332bf076165898417cf6678d2fc32df5c/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/debugger/posix/elf/ELFFileParser.java#L307
https://github.com/openjdk/jdk/blob/156f0b4332bf076165898417cf6678d2fc32df5c/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/debugger/posix/elf/ELFFileParser.java#L323

     for (int i = 0; i < Math.ceil(numSymbols / 2); i++) {

'numSymbols' is 'int'.

Seems we should remove them.