How to track log messages by thread

Main article: log

Since Resin is a multithreaded program, logging messages from many requests and threads are serialized in the log files. In some cases, it it useful to keep track of the log messages for a single thread.

The format attribute in the <log> tag lets you customize the log message to include the thread id The format is a string with interpolated EL expressions specifying the format. The value ${log.threadId} adds a thread identifier to the message, while ${log.message} returns the log message.

So an example format might be

 <log name="" level="finer" path="log/debug.log"
        format=" ${log.threadId}: ${log.message}"/>