Tomcat Crashes

[amolmistry]

hello,

Just now I grep "Error" from catelina.err and found below errors.

Please suggest how to deal with it.

Also suggest any basic precautions to take when dealing with Apache-Tomcat.

java.lang.NoClassDefFoundError: javax/el/ExpressionFactory
SEVERE: Skipped installing application listeners due to previous error(s)
SEVERE: Error listenerStart
SEVERE: Context [/testStruts] startup failed due to previous errors
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error deploying configuration descriptor NetBanking.xml
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error deploying configuration descriptor NetBank.xml
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error deploying configuration descriptor ImageStruts.xml
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error deploying configuration descriptor ImageUpload.xml
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error getConfigured
SEVERE: Context [/cgi-bin] startup failed due to previous errors
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error getConfigured
SEVERE: Context [/ondot] startup failed due to previous errors
SEVERE: Error configuring application listener of class com.sun.faces.config.ConfigureListener
java.lang.NoClassDefFoundError: javax/el/ExpressionFactory
SEVERE: Skipped installing application listeners due to previous error(s)
SEVERE: Error listenerStart
SEVERE: Context [/simpleStruts] startup failed due to previous errors
SEVERE: Error configuring application listener of class com.sun.faces.config.ConfigureListener
java.lang.NoClassDefFoundError: javax/el/ExpressionFactory
SEVERE: Skipped installing application listeners due to previous error(s)
SEVERE: Error listenerStart
SEVERE: Context [/testStruts] startup failed due to previous errors
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error deploying configuration descriptor NetBanking.xml
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error deploying configuration descriptor NetBank.xml
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error deploying configuration descriptor ImageStruts.xml
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error deploying configuration descriptor ImageUpload.xml
SEVERE: Error starting static Resources
SEVERE: Error in resourceStart()
SEVERE: Error getConfigured
SEVERE: Context [/cgi-bin] startup failed due to previous errors

 

[Greenhost]

It seems you missed a library. Search for the el-api.jar and check this link.

 

[amolmistry]

but Tomcat is working properly, only sometimes it get crashes and have to restart it again and again.

I did not got anything suspicious from catelina.err and catelina.out hence did grep for "Error" from catelina.err and found above log.

is it like if el-api.jar not installed then also tomcat can work?

 

[amolmistry]

Now Tomcat is not getting crashed, but found one thing that whenever any user upload his modified .jsp files then website stops working. then have to restart tomcat in order to start the website.