I do not know if it is possible in Java but I need a method to do a special “add function”. Let me explain, SHORT VERSION: Is it possible to add an int with an Integer object? I need a method to check if that integer object exists, and add 0 if the object is null, add the correct value
Allure report: nothing shown in Chrome
I’m trying to use Allure-framework to generate a report for my Selenium WebDriver tests. I use JUnit framework and allure-maven-plugin with version 1.3.9 of Allure. I run tests with mvn test then generate the report using mvn site. I see generated report in target/site/allure-maven-plugin/ directory. Wh…
Synchronization with static block
I have a question: can we use the static keyword with a synchronized method? As we all know that static is related to class and synchronization is used to block an object, using synchronized with static doesn’t make any sense to me. So why and in which situation would I use synchronization with the stat…
Convert base64 string to image
I am trying to crop/resize user profile image using jquery plugin namely crop.js which sends user image as base64 via ajax to my controller as but I unable to decode this base64 string as Image,Can you guys guide me how can I save my base64 string as image on my server?. Answer This assumes a few things, that…
Liquibase or Flyway database migration alternative for Elasticsearch
I am pretty new to ES. I have been trying to search for a db migration tool for long and I could not find one. I am wondering if anyone could help to point me to the right direction. I would be using Elasticsearch as a primary datastore in my project. I would like to version all mapping and configuration
Store JSON data in Java
I want to learn JSON data storage in Java using Eclipse, so I googled a lot. I found JSON.simple and GSON. Are those a good choice? I went to Properties >> Java Build Path >> Add External JARs. I added json-simple-1.1.1.jar and google-gson-2.2.4-release.zip. Is it right? Where is the JavaDoc locat…
For PBKDF2, using HMAC-SHA256 is more secure than using HMAC-SHA-1?
I’m looking for the proper Java algorithm for password encryption, and I found that Java SDK provides PBKDF2WithHmacSHA1, but not PBKDF2WithHmacSHA256. I heard that HMAC-SHA256 will take more time than HMAC-SHA-1 does. Since system resources are limited, I’m going to apply different iteration valu…
Tomcat vs Vert.x
For the past few days I have been reading Vert.x documents. I know that Vert.x is polyglot, single threaded, non-blocking IO, modular architecture, high scalability. Is there any other major differences between tomcat and Vert.x? Also when we should use tomcat and when to use Vert.x? Answer Tomcat is a servle…
Android Archive Library (aar) vs standard jar
I’ve been reading some articles about the new adoption of Gradle as the standard build system for Android apps. Well, coming from standard Java development I usually depend on jar files in order to build my project. However it seems that Android has also aar packages, which are the equivalent to the dll…
Unable to import certificate to cacerts
My requirement is to import a certificate for maven repositories into the global keystore. The certificate file is named maven-cacert.cer . I am using following command from C:Program FilesJavajdk1.6.0_20bin from cmd as maven-cacert.cer file is in C directory after pressing enter it asked to put password and …