I’m currently working through this tutorial on Stream processing in Apache Flink and am a little confused on how the TimeCharacteristics of a StreamEnvironment effect the order of the data values in the stream and in respect to which time an onTimer function of a ProcessFunction is called. In the tutori…
Integrate Kotlinx coroutines in intelliJ project
I‘m using intellij for a while now. There I work on a javaFx project, which is mainly written in java but I discovered Kotlin to be a nice alternative. Recently I read about coroutines in Kotlin and I just can‘t figure out how to add the Kotlinx library to my project. I can only find the snippets for maven an…
How can I supress the checkstyle message “Utility classes should not have a public of default constructor” when using Spring
In a Spring Java project I have the following class: Building using Jenkins tells me that I should not have a public or default constructor in a utility class. In my checkstyle.xml withing Treewalker file I have And the module I tried to supress the specific check using @SuppressWarnings({“PMD”, &…
Spring Boot application suddenly stops after outputing logo and version on Eclipse
When I execute Run As -> Java application my Spring Boot application class on Eclipse, I get Spring Boot logo and version in logs but it halts and stops after few seconds: There are no errors in console. Tried but didn’t help: Project -> Clean, project refresh on Eclipse gradle clean, build, eclip…
How to disable activiti auto deployment on Spring Boot project
I have a Spring Boot project where I used activiti-spring-boot-starter-basic 5.22 dependency. But whenever I am running the Spring Boot app the processes in src/main/resources/processes will always get deploy if it has been changed and I don’t want it to deploy. How can I disable auto deploy on Spring B…
Open New Activity from Android Button Click
In my app I’m developing in android studio, I’m making a button to redirect from one activity to another but it does not give me anything even though I do not have any errors in the code. Answer Check your id’s on your xml layout, also check there is no onClick XML property being used that c…
Get n-th child Element with Jsoup
For example a web site has a code like this: and I want to get the “second” div text with “Jsoup” and it has no attribute or class. Answer There are few ways to to it. select returns Elements instance which extends ArrayList<Element> so you can select all child divs and pick one …
How to cut paper after printing is done on Epson?
I have problem with cutting paper. I have Epson TM-T20 Receipt, and trying to cut paper after printing is done. I found somewhere that this is code for cutting byte[] bytes = { 27, 100, 3 }, but it’s not working. Below is code I’m using for printing. Answer Problem with this was fact that just str…
Kafka message ordering in partition while producer retry
According to producer configs, there are: retries and max.in.flight.requests.per.connection. Suppose that retries > 0 and max.in.flight.requests.per.connection > 1. Can messages arrive out of order within ONE partition of topic (e.g. if first message has retries, but second message delivered to broker w…
spring boot mvc – Content type ‘application/json;charset=UTF-8’ not supported
In this spring boot project I get an error when POSTing (using Postman) a new Item resource In the request body I copied one of the existing Items that I got from a GET request (and changed the id and itemName) I made sure that I have the correct getters and setters in the Item class (as this is a