But if you are running a web application which is running java components
it would be a good thing if it was possible to retrieve variable information
programmtically if you want to do debug stuff, for example
with the Log4j component.
http://jakarta.apache.org/log4j/docs/index.html

Remote debugging of java components which is executed from JSP or Servlets
with JBuilder requires enterprise edition as far as I can see, and
that is very expensive.

If it really is so impossible to get local variable information
at runtime, then how are these debugging environments for example
JBuilder implemented ?




"Paul Clapham" <pclapham@core-mark.com> wrote:
>You want a memory dump! But there's no way of doing that in Java. You
>might want to get yourself one of those IDEs like JBuilder or Visual Cafe
>where you can look at the variables as your class runs.
>
>PC2
>
>"Niklas" <niklas54321@yahoo.se> wrote in message
>news:3b2937b4$1@news.devx.com...
>>
>> How do you programatically get access to the names and contents of all
>variables
>> in the current variable scope ?
>> (attributes and local variables in the current method)
>>
>> I am usually mostly interested in Strings and the primitive datatype
>> int , but any objects toString() representation might also be of interest.
>>
>> What I would like to do, is to *avoid* manually concatenating here and
>there
>> in
>> the code like the ugly code example below, and being able to let
>> java itself figure out what attributes and local variables that currently
>> exist in the
>> method with the code.
>>
>> As an example, I would like to be able to replace hardcoded code like
>this:
>> <pre>
>> try {
>> // ... some code...
>> }
>> catch(myException e) {
>> String s = "An exception occurred in myClass.myMethod, when the
>> attributes and local variables had the following values: ";
>> s += " myStringAttribute = " + myStringAttribute ;
>> s += ", myIntAttribute = " + myIntAttribute;
>> s += ", myLocalString = " + myLocalString;
>> s += ", myLocalInt = " + myLocalInt;
>> writeToLogfile(s);
>> }
>> </pre>
>>
>> with call to some general method which automatically retrieves a string
>with
>> the names
>> and the contents of all attributes and local variables, kind of like this:
>> <pre>
>> try {
>> // ... some code...
>> }
>> catch(myException e) {
>> String s = "An exception occurred in myClass.myMethod, when the attributes
>> and local variables had the following values: ";
>> s += SomeClass.getStringWithAllVariableNamesAndValues(); // Here the
>requested
>> method is called
>> writeToLogfile(s);
>> }
>> </pre>
>>
>> Does it exist such a class and method in the standard java distribution,
>> or as a third party class ?
>>
>
>