So I have a small java game engine using a single JFrame. I am currently using Key-Bindings as they were working neatly but I figured that a KeyListener might be architecturally more fitting. But since I honestly don’t really care which I’ll use I wanted to ask if there is a performance difference…
Firestore Paging Adapter- How to know if query returns 0 results
I’m using firestore paging adapter to populate my RecyclerView with data from Firestore, if collection in Firestore is empty I would like to show a TextView to inform user about that, if it is not then I would like to populate EecyclerView with data but I don’t see a way to do this with Firestore …
Does the JRE support posix TZ description rather than TZ name?
Java doesn’t appear to apply DST offset when the OS uses a POSIX time zone description rather than a time zone name. Is the use of a TZ description unsupported by the JRE or is this behavior a bug? More details… I’m working on a Linux (Debian) based system where the TZ environment variable i…
Android Java Upload File via WebView without FileChooser
I need to write an Android application which is capable of loading a Website via a WebView. The Website contains an Input (Type=FILE) When loading is done, the application should use a specific Image and upload it via a storage path: I already tried to open a FileChooser-Dialog and that works, but I need a so…
Default HikariCP connection pool starting Spring Boot application
I’m using version: 2.1.6.RELEASE form Spring Boot in my pom.xml-dependencies. To connect to my database I put following in application.properties: When checking the amount of connections in postgresql with: I see each time I start the application exactly 10 connections are made. They almost all have the…
Presto cluster + how to tune the jvm.config according to memory resources
we are using presto cluster as distributed SQL query our cluster size 1 machine as coordinator machine 12 presto workers machines each machine is 64G memory size , and on each machine only presto application installed about the jvm.config on the workers , look like this and the jvm.config on the presto coordi…
ingest-attachment needs more rights
I have an app which uses the elastic search when I do apt ugrade I get I’m not familiar with java at all. Can you tell me what I’m supposed to do? Answer According to the discussion on elastic.io this is just a warning and by pressing “y” or using the option “-b”, the requi…
java.lang.NoClassDefFoundError on Android 4.2.2 Devices
I have an Android application and need to implement bluetooth low energy functionality. The BLE features should run on devices with Android API Level > 26 (Android 8), but the app should also start on devices with Android > 17 (Android 4.2). I have tested this app on Android 8 and 4.4 and there are no p…
Get size of json from MvcResult
I’m testing an API and get all data from the DB. I save the response as I get a json as response. I want to get the length of json array. So, if I have 2 rows in DB, I want to get 2 as a result. Or is there maybe another way to count number of rows which are
How to set excel sheet name in BIRT API?
When I use birt api to export excel, the excel’s sheet name is default set to Sheet0. Is there a way to custom sheet name in birt API?