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7 Common Socket Errors and Exception in Java Application [Solved]

In this blog, I plan to talk about some common exceptions and errors that arise while using sockets. Quite often, these socket issues arise out of application bugs, system settings or system load. It might be an unnecessary delay to go to product teams, only to discover that the issue can be resolved by tuning/configuring your local settings. Understanding these messages will not only help resolve the issues but also make a conscious effort in avoiding these scenarios while developing applications.

Linux mailx + mutt command Examples - 4 ways to send Email with Attachment from RHEL 5 and 6 Server

One of the common task for programmers working in Linux machine is to send emails, for example, your Java applications are running on Linux like RHEL 5 or RHEL 6 version and you need to send a report of all the clients connecting to your application. An easy way to accomplish this is to write a shell script, which will dump all clients in the log file and then use grep command and generate a report. If you have to grep logs from multiple hosts, you can also use the SSH command to run the same command on multiple hosts. Once you have got the list of clients connecting to your application, you can just send the CSV file to yourself in an email or to your application DL, or a group of users you want to.

find + du command example Linux - How to search/print large files and directories with size to free disk space?

One of the common problem while working in Linux is to find large files to free some space. Suppose, your file system is full and you are receiving an alert to remove spaces or if your host is run out of space and your server is not starting up, the first thing you do is find top 10 largest files and see if you can delete them. Usually, old files, large Java heap dumps are good candidates for removal and freeing up some space. If you are running Java application e.g. core Java-based programs or web application running on Tomcat then you can remove those heap dump files and free some space, but the big question is how do you find those? How do you know the size of the biggest file in your file system, especially if you don't know which directory it is? We'll try to find answers for some of those questions in this article.

How to Compare String by their length in Java?

One of the common programming tasks is to compare String, sometimes by their value and sometimes by their length. The natural way to compare String is the lexicographic way, which is implemented in the compareTo() method of String class, but sometimes you need to compare String by their length. You cannot use the default compareTo() method for that task, you need to write your own custom Comparator, which can compare String by length. Don't worry, It's easy to compare multiple String by their length, all you need to do is write a Comparator implementation which calculates their length using the length() method and compares them.

Difference between include directive, include action and JSTL import tag in JSP?

There are three main ways to include the content of one JSP into another:

include directive

JSP include action

and JSTL import tag

The include directive provides static inclusion. It ads content of the resource specified by its file attribute, which could be HTML, JSP or any other resource at translation time.

Any change you make in the file to be included after JSP is translated will not be picked up by include directive.