This error can be seen after 12.1.1, 12.1.3 Upgrade, also after JRE, JDK 7 Upgrade on IBM AIX 7.1 OS.
All Concurrent Requests were going into the error with following error in logfile,
REP-0069: Internal error
If you see the error message, java.lang.UnsatisfiedLinkError: net, it actually refers libnet.so here.. java.lang.UnsatisfiedLinkError: nio (Not found in com.ibm.oti.vm.bootstrap.library.path) libnet.so is in java directory.. exactly in this subdirectory --> jre/lib/ppc
Resolution / Workaround:
Check LD_LIBRARY_PATH & LIBPATH in Context File. It should contain jre/lib/ppc absolute path. In my EBS Environment, it was missing hence I added and ran autoconfig.
<LD_LIBRARY_PATH oa_var="s_tools_ldlib" osd="IBM_AIX">/u01/prod/oracle/apps/tech_st/10.1.2/lib32:/u01/prod/oracle/apps/tech_st/10.1.2/lib:/u01/prod/oracle/apps/tech_st/10.1.2/jdk/jre/lib/ppc:/usr/dt/lib:/u01/prod/oracle/apps/tech_st/10.1.2/jdk/jre/bin:/u01/prod/oracle/apps/tech_st/10.1.2/jdk/jre/bin/classic:/u01/prod/oracle/apps/apps_st/appl/sht/12.0.0/lib</LD_LIBRARY_PATH>
This action was fixed my problem.