Displaying 1 to 7 from 7 results

How to solve CommunicationsException in Java while using Hibernate and MySQL

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You might have faced CommunicationsException, basically timeout issue in Java while connecting to MySQL using Hibernate. The session would be timed out after certain period of time. You might be thinking that the your site or application is running without any issue but it would have stopped or crashed due to exception.

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JWT Authentication using Auth0 Library

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Json Web Token shortly called as JWT becomes defacto standard for authenticating REST API. In a traditional web application, once the user login credentials are validated, loggedin user object will be stored in session. Till user logs out, session will remain and user can work on the web application without any issues. Rest world is stateless, it is difficult to identify whether the user is already authenticated. One way is to use authenticate every API but that would be too expensive task as the client has to provide credentials in every API. Another approach is to use token.

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Read and Write PDF using OpenPDF

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OpenPDF is based on a fork of iText version 4. iText is a widely used PDF library but they changed their license and moved to AGPL. In this article, we can see how to read and write to PDF, How to extract text from PDF and How to create password protected PDF.

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Struts 1.x End Of Life. Whats alternative?

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The Apache Struts Project Team announced End of Life (EOL) for Struts 1.x web framework. Struts was launched in the year 2000. It is only of the widely used web framework. It gave better control over writing UI and business logic code directly in to JSPs.

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How hashmap works in Java. My style of learning.

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This is the most frequently asked questions in the interview. Googling will throw many links related to this topic. How to learn the implementation of hash map? My style of learning using open source learning technique.

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Generate Thumbnail in Java using Thumbnailator library 

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In our work there will be situation where we need to resize the image, generate thumbnails and so on. Users need to have little bit of image processing knowledge to achieve it. We have Java ImageIO APIs to achieve these functionalities. As said, we need to be aware of or spend time in learning these APIs. To help us, Thumbnailator library provides easy fluent style API and generates thumbnail in simple three lines of code.

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Connect to MongoDB and Perform CRUD using Java

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MongoDB is a popular and widely used open source NoSQL database. MongoDB is a distributed database at its core, so high availability, horizontal scaling, and geographic distribution is quite possible. It is licensed under Server Side Public License. Recently they moved to Server Side Public License, before that MongoDB was released under AGPL. This article will provide basic example to connect and work with MongoDB using Java.

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