Rung WebLogic server with 1.8.0 encounters this error:

Caused by: java.lang.IllegalArgumentException: committed = 86482944 should be < max = 50331648

        at java.lang.management.MemoryUsage.<init>(MemoryUsage.java:162)

        at sun.management.MemoryImpl.getMemoryUsage0(Native Method)

        at sun.management.MemoryImpl.getNonHeapMemoryUsage(MemoryImpl.java:75)

       ... 37 more

There is a bug in jmm_GetMemoryUsage here -- if a memory region does not define a maximum size, then the total_max is not updated:
      if (u.max_size() == (size_t)-1) {
        has_undefined_max_size = true;
      }
      if (!has_undefined_max_size) {
        total_max += u.max_size();
      }
But there memory region does define a committed size -- so the committed size is increased and the total_max size is not, and so the committed size ends up larger than the total_max size.

This occurs at least for the Metaspace region (pool->name() returns Metaspace) Which means, I suppose, that the metaspace region has a bug that it is not returning the maximum size? But also the management code should correctly report the maximum size in this instance as undefined rather than throwing an exception.