When starting the application or compiling JSP via ant, Tomcat 7 Jasper complains about superfluous or misplaced JAR file. I got below message
**compile-jsp:**
[jasper] Jul 31, 2012 7:15:15 PM org.apache.jasper.compiler.TldLocationsCache tldScanJar
[jasper] INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
how to Skipping unneeded JARs during scanning can improve startup time and JSP compilation time in tomcat?
how to enable better output?
Tomcat 8.5. Inside catalina.properties, located in the /conf directory set:
tomcat.util.scan.StandardJarScanFilter.jarsToSkip=\*.jar
Or go into context.xml, located in Tomcat's /conf directory and add:
<JarScanner scanClassPath="false"/>
For Tomcat 8, I had to add the following line to tomcat/conf/logging.properties for the jars scanned by Tomcat to show up in the logs:
org.apache.jasper.servlet.TldScanner.level = FINE
The above solution did not work for me. Instead I simply removed the hash(#) from the last line of the logging.properties file, to make it work.
# To see debug messages in TldLocationsCache, uncomment the following line:
org.apache.jasper.compiler.TldLocationsCache.level = FINE
The next step is to add the jars that Tomcat 7 is looking for in catalina.properties files just after the following line
org.apache.catalina.startup.TldConfig.jarsToSkip=
If it helps anyone, I just appended the contents of the below output file to the existing org.apache.catalina.startup.TldConfig.jarsToSkip= entry.
Note that /var/log/tomcat7/catalina.out is the location of your tomcat log.
egrep "No TLD files were found in \[file:[^\]+\]" /var/log/tomcat7/catalina.out -o | egrep "[^]/]+.jar" -o | sort | uniq | sed -e 's/.jar/.jar,\\/g' > skips.txt
Hope that helps.
The warning comes up because Tomcat scans all Jars for TLDs (Tagging Library Definitions).
Step1: To see which JARs are throwing up this warning, insert he following line to tomcat/conf/logging.properties
org.apache.jasper.servlet.TldScanner.level = FINE
Now you should be able to see warnings with a detail of which JARs are causing the intial warning
Step2 Since skipping unneeded JARs during scanning can improve startup time and JSP compilation time, we will skip un-needed JARS in the catalina.properties file. You have two options here -
- List all the JARs under the
tomcat.util.scan.StandardJarScanFilter.jarsToSkip. But this can get cumbersome if you have a lot jars or if the jars keep changing. - Alternatively, Insert
tomcat.util.scan.StandardJarScanFilter.jarsToSkip=*to skip all the jars
You should now not see the above warnings and if you have a considerably large application, it should save you significant time in deploying an application.
Note: Tested in Tomcat8
Uncomment this line (in /conf/logging.properties)
org.apache.jasper.compiler.TldLocationsCache.level = FINE
Work's for me in tomcat 7.0.53!
For Tomcat 8, I had to add the following line to catalina.properties for preventing jars scanned by Tomcat:
tomcat.util.scan.StandardJarScanFilter.jarsToSkip=jsp-api.jar,servlet-api.jar
None of the above worked for me (tomcat 7.0.62)... As Sensei_Shoh notes see the class above the message and add this to logging.properties. My logs were:
Jan 18, 2016 8:44:21 PM org.apache.catalina.startup.TldConfig execute
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
so I added
org.apache.catalina.startup.TldConfig.level = FINE
in conf/logging.properties
After that I got so many "offending" files that I did not bother skipping them (and also reverted to normal logging...)
The error message states which logger it is using, so set that logger .level:
[jasper] Jul 31, 2012 7:15:15 PM org.apache.jasper.compiler.TldLocationsCache tldScanJar
So the logger is org.apache.jasper.compiler.TldLocationsCache. In your logging.properties file, add this line:
org.apache.jasper.compiler.TldLocationsCache.level = FINE
If the extra entries in the log bother you but an extra second of start-up time doesn't, just add this to your logging.properties and forget about it:
org.apache.jasper.servlet.TldScanner.level = WARNING
来源：https://stackoverflow.com/questions/14375673/how-to-fix-jsp-compiler-warning-one-jar-was-scanned-for-tlds-yet-contained-no-t