OPMN CRASHES IF THE WEBCACHE.PID FILE EXISTS WITH 0 BYTES AND WE START WEBCACHE

Bug 6447507

In Application Server 10.1.2, if the $ORACLE_HOME/webcache/webcache.pid
file exists but it has 0 bytes and you try to startup the WebCache component
the WebCache component is not started up and opmn processes die, leaving the
other opmn managed processes orphans. A manual kill of them needs to be
performed followed by an opmnctl startall to fix the problem. The problem may
happen if the filesystem where the ORACLE_HOME is hosted gets full.

Solution:
rm $ORACLE_HOME/webcache/*.pid
touch $ORACLE_HOME/webcache/webcache.pid