Tomcat 8 enable debug logging to list unneeded jars

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Try debugging for everything by:

  1. Adding this to the end of your logging.properties file located in {CATALINA-HOME}/conf:

    #To see the most detailed level of logging for all classes, uncomment the following line:
org.apache.catalina.level=FINEST

  2. Restart Tomcat

  3. Run the following from Terminal to get a list of jars that need to be skipped (courtesy of @joseph-lust on this post):

    egrep "No TLD files were found in \[file:[^\]+\]" {CATALINA-HOME}/logs/catalina.out -o | egrep "[^]/]+.jar" -o | sort | uniq | sed -e 's/.jar/.jar,\\/g' > ~/skips.txt

  4. Open skips.txt in your user home directory

  5. Add this list to {CATALINA-HOME}/conf/catalina.properties after the following line:

    org.apache.catalina.startup.TldConfig.jarsToSkip=
  6. Make sure to remove/comment out this when you are done to prevent your log files from growing too large

I am still not sure why this happens, as it seems to work for most to uncomment the TldLocationsCache line.

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