How can to monitor Memory consumption and Threads report on PI 7.31

Hi Gurus,

I have an guees about how can i monitor Memory consumption, Threads report, session monitoring on PI 7.31 Java.

Before I can monitor these on http://fullservername/irj/portal but now when i put this on the PI 7.31 it does not work. it displays

  500   Internal Server Error
  SAP NetWeaver Application Server 

  Error: Application error occurred during the request processing.

  SAP Technology Troubleshooting Guide

Details: WebApplicationException log ID is [C0000ABE0393D961000000060000155C].

Would everybody helpme ??

Thanks you,

JM