I run my Integration Test cases with Spring Boot with the help of my local Redis server on my machine. But I want an embedded Redis server which is not dependent on any server and can run on any environment, like the H2 in-memory database. How can I do it? Answer You can use an embedded Redis like https://git…
Spring Data Rest – Soft Delete
I’ve been using spring data rest without any problem but now I have a requirement that when a user performs a DELETE operation on a given entity i.e. DELETE /accounts/<id> I need to set a flag on the database marking that entity as deleted but i do want to keep the record. Basically this means tha…
Logging with Retrofit 2
I’m trying to get the exact JSON that is being sent in the request. Here is my code: But I only see this in the logs: How am I supposed to do proper logging, given the removal of setLog() and setLogLevel() which we used to use with Retrofit 1? Answer In Retrofit 2 you should use HttpLoggingInterceptor. …
PostgreSQL throws “Connection has been abandoned” -> “An I/O error occurred while sending to the backend”
I know that there are a lot of topics about abandoned connections , however I can’t figure out what is the problem in my case, so I really hope for some help. I have a Java application with Spring, which fetches some data from external services, and tries to save it in database. I have the following con…
ScheduledExecutorService or ScheduledThreadPoolExecutor
I’m building an Android App which have to periodically do something in a Service. And I found that using ScheduledThreadPoolExecutor and ScheduledExecutorService is preferable to Timer. Can anyone explain the difference between ScheduledExecutorService and ScheduledThreadPoolExecutor and which one is mo…
Java – How do I get an image to display?
I have spent a really long time trying to find a way to display an image in a Java program (I’m trying to learn how to make a 2D Java game) an nothing that I’ve tried works. I’m using Eclipse Mars and the latest of everything else. Here is my code: Please, just tell me how to correct the cod…
How to get to the end of a line in android studio
Is there a way to get the cursor to the end of the current line? That is, without using the End key, Ctrl + Left/Right or the mouse. It’s time consuming to get to the end of the line when there’s some code after the cursor. eg. In a strings.xml file, the end tag is automatically generated and afte…
Spring Batch restart persistent jobs after abnormal termination
I have a following Spring Batch Job config: I’m starting the job with a following code: This is my test tasklet: I use H2 database as a persistent storage for my jobs. During the jobs execution I’m terminating my application. Right after application restart I expect that all uncompleted jobs will …
What is the solution for the N+1 issue in JPA and Hibernate?
I understand that the N+1 problem is where one query is executed to fetch N records and N queries to fetch some relational records. But how can it be avoided in Hibernate?
How to setup Struts 2 within existing Eclipse by maintaining other configuration?
I am a novice programmer in using Apache Struts 2 MVC Framework. I want to setup Struts 2 within my existing Eclipse IDE and I don’t want to harm other different works I do in Eclipse. Here is a list of things I do in Eclipse and other related works: I am currently using eclipse ide for Java SE develope…