Debugging JSPs and Servlets
Hello, I am trying to create an environment that will assist in debugging jsps, i think one of the basic ways to do debugging is through logging, I want to log various request coming in along with the request parameters, i checked the access loggs but they only logg GET request also it doesnt logg the parameters, is there anyway i can logg POST request too along with the request parameters, i can possibly use a filter to do it, will that be a right approach also can i configure a filter to run for all the servlets? Also is it possible to logg something like forwards to another page and including other pages, also if you have any other suggestions to add features that will assist in debugging that i can implement i will greatly appreciate it. Thanks, Nitin -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
RE: Debugging JSPs and Servlets
Take a look at Log4j http://jakarta.apache.org/log4j/docs/index.html It has been the greatest debugging tool I have found. -Original Message- From: Nitin Vira [mailto:[EMAIL PROTECTED]] Sent: Wednesday, February 27, 2002 12:47 PM To: Tomcat Users List Subject: Debugging JSPs and Servlets Hello, I am trying to create an environment that will assist in debugging jsps, i think one of the basic ways to do debugging is through logging, I want to log various request coming in along with the request parameters, i checked the access loggs but they only logg GET request also it doesnt logg the parameters, is there anyway i can logg POST request too along with the request parameters, i can possibly use a filter to do it, will that be a right approach also can i configure a filter to run for all the servlets? Also is it possible to logg something like forwards to another page and including other pages, also if you have any other suggestions to add features that will assist in debugging that i can implement i will greatly appreciate it. Thanks, Nitin -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
Re: Debugging JSPs and Servlets
2/27/02 11:17:26 PM, Nitin Vira [EMAIL PROTECTED] wrote:
Hello,
I am trying to create an environment that will assist in debugging jsps, i think one
of the basic ways to do debugging is through logging, I want
to log various request coming in along with the request parameters, i checked the
access loggs but they only logg GET request also it doesnt
logg the parameters, is there anyway i can logg POST request too along with the
request parameters, i can possibly use a filter to do it, will that
be a right approach also can i configure a filter to run for all the servlets? Also is
it possible to logg something like forwards to another page and
including other pages, also if you have any other suggestions to add features that
will assist in debugging that i can implement i will greatly
appreciate it.
Use Log4J. (http://jakarta.apache.org/log4j)
Log4J has something called Logging Levels, e.g. DEBUG, ERROR, INFO etc...
Let's say you have some 15 packages with some 10 classes in each.
In each class, instantiate a Logger with the statement
static Logger logger = Logger.getInstance(MyClass.class.getName());
Now within the class, write both DEBUG level statements and INFO level statements:
e.g.
public void someTask(String first, String second){
logger.debug(just entered the someTask method, args are + first + : +
second);
logger.info(about to calculate something);
int x = calculate();
logger.debug(the calculation result was + x);
}
Now, DEBUG levels happen to be lower in importance than INFO levels.
Log4J can be instructed on which level to log via a properties file.
So, you can change log levels, or even disable loggin altogether via an external
properties file. No changes to the code are required at all.
Also, you can specify that the log outputs from a particular class should be
redirected to one file, while all other logs could go to another file, or
even a JDBC target.
Thanks,
Nitin
Sriram
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Re: Debugging JSPs and Servlets
On Wed, 27 Feb 2002, Nitin Vira wrote: Date: Wed, 27 Feb 2002 09:47:26 -0800 From: Nitin Vira [EMAIL PROTECTED] Reply-To: Tomcat Users List [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] Subject: Debugging JSPs and Servlets Hello, I am trying to create an environment that will assist in debugging jsps, i think one of the basic ways to do debugging is through logging, I want to log various request coming in along with the request parameters, i checked the access loggs but they only logg GET request also it doesnt logg the parameters, is there anyway i can logg POST request too along with the request parameters, i can possibly use a filter to do it, will that be a right approach also can i configure a filter to run for all the servlets? Also is it possible to logg something like forwards to another page and including other pages, also if you have any other suggestions to add features that will assist in debugging that i can implement i will greatly appreciate it. Thanks, Nitin -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] Logging stuff for yourself is a nice use case for a Filter. In fact, there's an example filter that does this kind of thing in the examples webapp included with Tomcat 4. Source code is in file /WEB-INF/classes/filters/RequestDumperFilter.java. You can see how it's configured by looking at the web.xml file for this app. Craig -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
Re: Debugging JSPs and Servlets
For the quick and dirty approach, you can put System.out.println()
statements in your code and find the output in:
TOMCAT_HOME/logs/catalina.out
--- Sriram Narayanan [EMAIL PROTECTED] wrote:
2/27/02 11:17:26 PM, Nitin Vira [EMAIL PROTECTED] wrote:
Hello,
I am trying to create an environment that will assist in debugging
jsps, i think one of the basic ways to do debugging is through
logging, I want
to log various request coming in along with the request parameters, i
checked the access loggs but they only logg GET request also it
doesnt
logg the parameters, is there anyway i can logg POST request too
along with the request parameters, i can possibly use a filter to do
it, will that
be a right approach also can i configure a filter to run for all the
servlets? Also is it possible to logg something like forwards to
another page and
including other pages, also if you have any other suggestions to add
features that will assist in debugging that i can implement i will
greatly
appreciate it.
Use Log4J. (http://jakarta.apache.org/log4j)
Log4J has something called Logging Levels, e.g. DEBUG, ERROR, INFO
etc...
Let's say you have some 15 packages with some 10 classes in each.
In each class, instantiate a Logger with the statement
static Logger logger = Logger.getInstance(MyClass.class.getName());
Now within the class, write both DEBUG level statements and INFO
level statements:
e.g.
public void someTask(String first, String second){
logger.debug(just entered the someTask method, args are + first +
: + second);
logger.info(about to calculate something);
int x = calculate();
logger.debug(the calculation result was + x);
}
Now, DEBUG levels happen to be lower in importance than INFO levels.
Log4J can be instructed on which level to log via a properties file.
So, you can change log levels, or even disable loggin altogether via
an external properties file. No changes to the code are required at
all.
Also, you can specify that the log outputs from a particular class
should be redirected to one file, while all other logs could go to
another file, or
even a JDBC target.
Thanks,
Nitin
Sriram
_
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