Im having issues trying to install JRE into my docker container. I keep getting the error message; If I scroll up the build output a bit, I also see the following issues; My Dockerfile is very simple, but it just wont work It looks to be using debian buster, any help getting this to work would be greatly appr…
Jackson encode all properties to base64
I have more than one class that I want to serialize using Jackson to generate Json, for example I need to encode all value of the json to base64, so I configure the object mapper like this The problem is it’s only encode the String type as the serializer only accept one type, is there any method to enco…
How to fix a java.lang.UnsatisfiedLinkError for JSSC? (Needs hard float?)
I have a Java application in a JAR that needs to communicate via serial using JSSC (On Ubuntu in a SOPine board). It is throwing the following java.lang.UnsatisfiedLinkError exception: TL;DR: Skip to the answer if you don’t want to read several day’s worth of troubleshooting. I exported my JAR fil…
Jackson ObjectMapper returns null when Object variable is set to Private
I am given this escaped JSON and I need to convert it to Java object using Jackson. I created the class: Then I created the method to convert it Whichever variables in Data class that are set to public, then I will get the corresponding value when I call getters. Whichever variables in Data class that are set…
How to make solid color for databar in apache.poi
I’m trying to create a sheet with progress bar which will represent some progress. I’m using these libraries: org.apache.poi:poi:4.1.0 org.apache.poi:poi-ooxml:4.1.0 org.apache.poi:poi-ooxml-schemas:…
How to disable a button and clear an arraylist?
i have some button and arraylist, my button have condition if(list.isEmpty){ button.setEnabled(false) } and textTotalFinalPrice set value to 0 but in my case , that function actually …
What does this ObjectWeb error mean: “Unsupported class file major version 56” and how do I fix it?
(Editors note: This is objectweb, not the JVM complaining. Be very sure before knee-jerk closing as duplicate) I’m sort of reviving a project that was left in a broken state when I try to run the tests I get this error: What does that mean? Any ideas how to fix it? The Maven project includes: but commen…
What does timeout operator measure exactly for a Mono chain in Reactor and Webflux?
i’m using Spring Webflux and trying to understand the timeout concept for a chain of Monos. For example, there’s a chain of Mono calls: How is timeout going to be applied: 1) For the operations in general (sum time of operations) 2) For ech operation (each operation should take no longer than time…
Send spinner data to database
I am trying to send data to database from a spinner I initialize the database like this SPINNER + ” TYPE “; And in insert data method I put it as Type spinner but this line gives me an error contentValues.put(SPINNER, spinner); what should I put there instead of put Answer You are trying to save a…
What does the new keyword “yield” mean in Java 13?
Java 13 introduced the yield keyword for switch expressions. How can I use it and what’s the difference to a default return or break value?