Following is the longest Linux command using pipe which I came across today while working with some API gateway, This is a standard access log filtering to find out client identifier involved in API failure. Here is the details about what this command will do step by step, The cat… Continue Reading Longest Linux Command Using Pipe

We have been trying to upgrade our application from using JBOSS 5.1 to Wildfly 10.1. We have rolled out the changes and got stuck in production due to missing performance settings. This blog is to give those performance settings in Wildfly 10.1 that we used. The most important miss we… Continue Reading Performance settings in Wildfly 10.1

Is there is some one in your organization feeling secured about accessing his Linux system and provided you Putty Private Key (PPK) file. This blog will tell you how to Login using PPK file using Putty. I assume that you have already installed Putty in your system and path has been updated… Continue Reading Login using PPK file in Putty

The downloaded Wildfly 10.1 installer gives startup error like below (But start up gets completed) when starting at command line, There are lot of google search was resulting to check for folder permission, etc. In my situation the issue turns out to be with Wildfly startup adding server log… Continue Reading Wildfly Startup Logfile configuration Issue

Are you new to Wildfly (10.1)?  Are you a developer for an Enterprise Application which deals with lot of database operation during application start up?  If yes, you might have definitely seen Wildfly throwing Timeout Exception  to your surprise. The detailed exception trace might be something like below, Widlfly offers… Continue Reading Wildfly Timeout Exception

What is ConcurrentModificationException? According to Oracle(TM) Java doc it is thrown when an object is modified but the operation should not be allowed at that time. I faced this issue when my application is built and ran using Java8. The same application was working fine with out any issue if I… Continue Reading Collections.sort changes in Java8

If you are using Wildfly 10.1 for your load test your REST application, you should have definitely got into to Wildfly hanging issue with in 30 minutes of run. This is a known issue with XNIO and issue is tracked as part of WFLY-7275. The hanged thread dump will have… Continue Reading Wildfly hanging in 30 minutes of load test

If your organization is using JBOSS then you must be using them configured with https rather than http. During development did you check what are the different protocol (and ciphers) that your JBOSS version supports. This blog will list those for few popular JBOSS versions. The results were obtained using… Continue Reading JBOSS – SSL Version and Cipher list

In one of my project, we used to keep commands inside an text file. We will be getting new files every day/week/month and the frequency of getting such file is unpredictable. Every file that our file server receives will be named like file.1,file.2…file.110,file.111,file.112, etc. We bundle all these files on… Continue Reading Linux find files using filename pattern and cat its content