Home » Author Archives: Emmanouil Gkatziouras

Author Archives: Emmanouil Gkatziouras

He is a versatile software engineer with experience in a wide variety of applications/services.He is enthusiastic about new projects, embracing new technologies, and getting to know people in the field of software.

Spring-Boot and Cache Abstraction with HazelCast

spring-interview-questions-answers

Previously we got started with Spring Cache abstraction using the default Cache Manager that spring provides. Although this approach might suit our needs for simple applications, in case of complex problems we need to use different tools with more capabilities. Hazelcast is one of them. Hazelcast is hands down a great caching tool when it comes to a JVM based ...

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Spring boot and Cache Abstraction

spring-interview-questions-answers

Caching is a major ingredient of most applications, and as long as we try to avoid disk access it will stay strong. Spring has great support for caching with a wide range of configurations. You can start as simple as you want and progress to something much more customizable. This would be an example with the simplest form of caching ...

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Integrate Spring Boot and EC2 using Cloudformation

spring-interview-questions-answers

On a previous blog we integrated a spring boot application with elastic beanstalk. The application was a servlet based application responding to requests. On this tutorial we are going to deploy a spring boot application, which executes some scheduled tasks on an ec2 instance. The application will be pretty much the same application taken from the official spring guide with ...

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Embed Jython to you java codebase

Jython is a great tool for some quick java scripts using a pretty solid syntax. Actually it works wonderfully when it comes to implement some maintenance or monitoring scripts with jmx for you java apps. In case you work with other teams with a python background, it makes absolute sense to integrate python to your java applications. First let’s import ...

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Java on the AWS cloud using Lambda

java-interview-questions-answers

Amazon Web Services gets more popular by the day. Java is a first class citizen on AWS and it is pretty easy to get started. Deploying your application is a bit different, but still easy and convenient. AWS Lambda is a compute service where you can upload your code to AWS Lambda and the service can run the code on ...

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Spring Security and Custom Password Encoding

spring-interview-questions-answers

On a previous post we added password encoding to our spring security configuration using jdbc and md5 password encoding. However in case of custom UserDetailsServices we need to make some tweeks to our security configuration. We need to create a DaoAuthenticationProvider bean and set it to the AuthenticationManagerBuilder. Since we need a Custom UserDetailsService I will use use the Spring ...

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Spring Security and Password Encoding

spring-interview-questions-answers

On previous posts we dived into spring security. We implemented security backed by jdbc, security based on custom jdbc queries and security retrieving information from a nosql database. By being careful enough we will find out that passwords are in plain text. Although this serves well for example purposes in real environments, passwords are always encoded and stored encoded in ...

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Scan DynamoDB Items with DynamoDBMapper

java-interview-questions-answers

Previously we covered how to query a DynamoDB database either using DynamoDBMapper or the low level java api. Apart from issuing queries, DynamoDB also offers Scan functionality. What scan does, is fetching all the Items you might have on your DynamoDB Table. Therefore scan does not require any rules based on our partition key or your global/local secondary indexes. What ...

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