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...
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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”
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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?…
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.
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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. … Read...
07: Debugging Spring Transaction Management
Never just trust that adding @Transactional annotation is going to create a transactional boundary for your service layer. EventRestController –> EventMergeProcesorImpl –> EventControlDAOImpl The @Transactional annotations added to “public” …...
5 Ways to debug thread-safety issues in Java
Interviewers often judge your experience with debugging skills. For example, debugging jar hell issues, debugging SSL issues, debugging hibernate issues, debugging transaction management issues, etc. All these are covered in detail under the key areas “
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7 Java debugging interview questions & answers
Q1. How would you go about debugging thread-safety or concurrency issues? A1. #1: Manually reviewing the code for any obvious thread-safety issues. … Read more ›...
Chrome Postman to test and debug RESTful Web Services
Step 1 You need to get the Postman extension for the Google chrome browser.
Step 2 Search and add POSTMAN.
Step 3 Once installed,
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Debugging “NoSuchMethodError” in Java
The JAR hell issues also lead to exceptions like NoSuchMethodError or IllegalArgumentException. I have already discussed debugging JAR Hell issues. #1 Check the war file for any duplicate versions of...
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