Got deadlock?

killall -QUIT java

This will log the thread dumps for your java processes wherever the processes standard output is configured.

If you want to delete a PATTERN from a Log File.

$ sed ‘/PATTERN/d’ server.log > newServer.log

If you want to write a small script to do it:

#!/bin/sh
files="/home/user/app/logs/*.log"
for f in $files
do
  sed '/PATTERN/d' $f > $f.out
  mv  $f.out $f
done

Now if you want to do it for a bunch of log files, I wrote a script that works for me:

#!/bin/sh

# Check usage
if [ $# -lt 2 ] ; then
    echo "Syntax: $0  <DeleteString> <Directory/Pattern>"
    echo "Example: $0 DefaultRequestDestination ./logs/*webser*.log*"
    exit 1
fi

PATTERN=$1
shift

# Print Warning Info: About to mess with your logs
for f in $@
do
	echo "Will Delete Lines Containing: $PATTERN in file: $f"
done

read -p "Are you sure? " -n 1
if [[ $REPLY =~ ^[Yy]$ ]]; then

	echo "OK Cleaning... "

	# Loop over files pattern
	files=$@ 
	for f in $files
	do
		echo "Cleaning: $f"
		sed "/"${PATTERN}"/d" $f > $f.out
		mv  $f.out $f
	done
fi