I am using https://github.com/allegro/json-avro-converter to convert my json message into an avro file. After calling the convertToAvro method I get a byte array: byte[] byteArrayJson. Then I am using the commons library from Apache: The file is created. When I try to reconvert it to json, using: I have creat…
Getting “cannot find symbol” error with reader.nextLine()
Here is my code (it is code to reverse a given string) But I cannot take in input because when I try to take the string input I get a “cannot find symbol error” even though I have clearly defined the variable “text”. This question is from MOOC.fi’s Java OOP course, and can be fou…
Functional style java.util.regex match/group extraction
Using java.util.regex to extract substrings I find myself implementing the same code pattern working around calls to : Is there a functional extension or popular library (guava / apache commons) that avoids the ugly unnecessary and error-prone local variable, like: and also a stream of match results like: It …
Fragment with different size than the nav host fragment
I’m using the navigation architecture component in my single activity app and it works fine but what I’m facing is that in one of the fragments I need to have another fragment that takes about 60% of the initial fragment size (60% of the nav host fragment). How can I achieve that? Answer I now cha…
How to deserialize BigDecimal value received from kafka broker through debezium CDC mechanism?
I have a couple of microservices developed using spring boot and each has its own Postgres database. These microservices exchange data with a CDC mechanism provided by debezium platform through kafka broker and kafka connect. I have a microservice A that stores some entities with a BigDecimal attribute. Anoth…
Apache Beam: Kafka consumer restarted over and over again
I have this very simple Beam Pipeline that reads records from a Kafka Topic and writes them to a Pulsar Topic: From my understanding this should create exactly one Kafka Consumer that pushes it’s values down the Pipeline. Now for some reason the Pipeline seems to restart over and over again creating mul…
Executing multiple commands over SSH “exec” channel on firewall device with Java JSch does not work
I referred the question Multiple bash commands and implemented as below. I am connecting to a device for which first command should be configure then only I will get a prompt to execute all other commands. I don’t get output for any of the commands and the control does not return. The following are the …
How to verify user purchase for a non-consumable product on app launch
I just completed setting up inapp billing using google play billing with aidl. On successful purchase the premium feature is activated through a boolean. But after the app is closed and relaunched, premium feature disappears. i.e the boolean reverts to false. I would like to know how to ensure the boolean sta…
How to add many SSL certificates for Java application inside docker?
I’m new in docker. I want to add several certificates for Java application inside Docker. I’m using this code in Dockerfile: and it works fine, but only for one certificate. How I can add all certificates from /files folder with one line command or in some cycle or maybe with bash file? UPDATED: I…
java.lang.NoSuchMethodError: org.json.JSONObject.(Ljava/lang/Object;)V
I have a basic SpringBoot 2.1.5.RELEASE app. Using Spring Initializer, JPA, embedded Tomcat, Thymeleaf template engine, and package as an executable JAR file with some RestControllers. In 1 of the controller this is the body I send: so I create this class to send it as a RequestBody: and public class Hotelswi…