Format and Consistency of Log statements in Geronimo

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Format and Consistency of Log statements in Geronimo

Ashish Sureka

We [Professor and PhD Student in Software Engineering at a State University in India] are working towards a source code analysis tool which can assist practitioners in writing effecting log statements. There are more than 10000 log statements in Geronimo (s_logger.error, s_logger.warn, s_logger.trace, s_logger.info……………….)


The focus of this email is on format and consistency of log statements. We analyzed all the log statements and observe that the log statements prints a message and variable(s).  However it does not print the log level, timestamp and thread-name. I believe you agree with me that - Information like timestamp [Date date= new Date(); new Timestamp(date.getTime())] and thread-name [Thread.currentThread().getName()] is useful for diagnosing production failure and root-cause analysis. It is also useful in studying patterns and trends.


There are only 2 places where we found the thread-name to be printed:

·         LOG.debug("Set universe: " + Thread.currentThread() + " " + newUniverse);

·         LOG.debug("Restored universe: " + Thread.currentThread());

We have the following questions:

1)      Why log-level, timestamp and thread-name is not logged.

2)      How important (different people may have different opinion) is Point 1 (mentioning log-level, timestamp and thread-name)

3)      Is there a standard guideline for developers for writing log statements – which Geronimo developers need to follow

4)      Do you use any log-analysis tool? How are logs analyzed (visual inspection, home-grown tool/program, external open-source/commercial tool)?

5)      Geronimo can be used in a multi-threaded environment and I am not clear why the thread name is not printed

Thanks in advance and appreciate it. We want to build a tool (not just about format and consistency) that will be practically useful to practitioners and will make it open-source & publicly available. This is part of an academic/research study and hence request a response to all questions.


Thanks and Regards,


Ashish and Sangeeta


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