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The following has been reported on the ppc-aix-port-dev mailing list about running openjdk8 on AIX :
http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2017-December/003303.html

I'm getting an unsatisfied link error when using logstash on AIX but I suspect the issue is with AIX or the JRE, the exception is:

java.lang.UnsatisfiedLinkError: sun.management.OperatingSystemImpl.getProcessCpuLoad()D
getProcessCpuLoad at sun/management/OperatingSystemImpl.java:-2
at org/logstash/instrument/monitors/ProcessMonitor.java:40
detect at org/logstash/instrument/monitors/ProcessMonitor.java:79
generate at org/logstash/instrument/reports/ProcessReport.java:15

this is the line in logstash:

this.cpuProcessPercent = scaleLoadToPercent(unixOsBean.getProcessCpuLoad());

https://github.com/elastic/logstash/blob/master/logstash-core/src/main/java/org/logstash/instrument/monitors/ProcessMonitor.java

Could anybody help steer me in the right direction?
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An investigation of the issue shows that the native methods
Java_sun_management_OperatingSystemImpl_getProcessCpuLoad
Java_sun_management_OperatingSystemImpl_getSystemCpuLoad
are missing for AIX in jdk8.
In jdk9 the problem is not present because AIX has 9/jdk/src/jdk.management/aix/native/libmanagement_ext/UnixOperatingSystem.c containing empty basic implementations.
The fix will provide empty basic implementations as well for AIX in 8.