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02: HTTP basics on headers, MIME types, & cookies for Java developers

Q1. What happens when you open up a browser and type a URL to request a Web page or RESTFul web service data? A1. HTTP is a stateless protocol on top of TCP (Transmission Control Protocol). 1) When the IP address is obtained, … Read more ›...

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03: Identifying and fixing NonUniqueObjectException in Hibernate

NonUniqueObjectException is thrown when there is an object already associated with the session with the same id (primary key) (i.e. a duplicate). It is important to understand the concept of a “detached” object in Hibernate. This is one of the most common errors, understanding why and when this error is thrown will save you time in identifying and fixing this issue.

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04: Identifying and fixing LazyInitializationException in Hibernate

LazyInitializationException is thrown when an object becomes detached, and if you try to access associated (i.e. proxied) object(s) of a detached object.

Q. What is a detached object in Hibernate?

When you close an individual Hibernate Session, the persistent objects you are working with are detached.

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05: Debugging Hibernate & handling 4 common issues

#1. Enable Logging in your log4j.xml, log4j.properties, or myapp-logback.xml

In the log4j.properties file, you can enable Hibernate SQL logging as shown below

or in your log4j.xml or myapp-logback.xml as

You can then check your logs for the SQLs executed and the parameters passed. The example below shows 3 parameters passed to an update query

#2.

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06: Debugging NoSuchBeanDefinitionException in Spring

#1. Adding the @Named annotation to the interface instead of the implementation Adding the @Named, @Component, @Repository, etc annotation on the interface as opposed to the implementation class. The code below can throw “NoSuchBeanDefinitionException” FIX: The @Named annotation is now in the implementation class. … Read more ›...

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