Question

I want to debug a program by using system.out.println() and what to
check the flow and variables value in eclipse while running a JIRA
plugin which is a Servlet .
When I make some changes to the code in eclipse it reflects on the
browser but when I use system.out.println where should i see the
output ?

Example Code :

    @RequiresXsrfCheck
    protected String doExecute()
    {   

        LOG.info("BulkCloneDetails doExecute start...");
        filterUrl = null;
        cloneSubTasks = false;
        cloneAttachments = false;
        deleteAfterClone = false;
        requestId = null;
        issues = null;
        getServerInfoFromPage();  

        **System.out.println("Print something here");**

        errorsCollection.put("filterPath", i18n.getText("Remote login failed"));
        addErrors(errorsCollection);
        return SUCCESS;

    }  

Answer 1

You can put a tail on a file in Terminal so that you can see how it is interacted with. On a webapp I am working on I use the below method.

Username$ cd /Applications/tomcat/apache-tomcat-6.0.16/logs

Then type

tail –f catalina.out 

This will then print to your Terminal window. I have had to use this method on a few projects. I advise you to use system.out.println("Name of the File I am printing from") so that if you have several of such then you will know where they are coming from and in what order.