How to fix org.hibernate.LazyInitializationException – could not initialize proxy – no Session

What is wrong here is that your session management configuration is set to close session when you commit transaction. Check if you have something like: in your configuration. In order to overcome this problem you could change the configuration of session factory or open another session and only than ask for those lazy loaded objects. … Read more

Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]

Cause: The error occurred since hibernate is not able to connect to the database.Solution:1. Please ensure that you have a database present at the server referred to in the configuration file eg. “hibernatedb” in this case.2. Please see if the username and password for connecting to the db are correct.3. Check if relevant jars required for … Read more

What is an ORM, how does it work, and how should I use one? [closed]

Introduction Object-Relational Mapping (ORM) is a technique that lets you query and manipulate data from a database using an object-oriented paradigm. When talking about ORM, most people are referring to a library that implements the Object-Relational Mapping technique, hence the phrase “an ORM”. An ORM library is a completely ordinary library written in your language … Read more