I’m trying to use Firebase email and password authentication in Java using their REST API, as their Admin SDK doesn’t provide the needed methods to log in etc., only user management methods. With help from this answer, I’ve managed to put together the following code, which works for correct …
How to solve this java problem efficiently [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 3 months ago. Improve this question I am trying to solve this problem and I worked out a solution but its too slow, this is my …
How to improve java.util.zip.GZIPInputStream performance to unzip a large .gz file?
I’m trying to unzip a very large .gz file in java around 50MB and then transferring it to hadoop file system. After unzipping, the file size becomes 20 GB. It takes more than 5 min to do this job. Even after using Buffered I/O streams, it is taking very long to decompress and transfer the file. Does Had…
The Kafka topic is here, a Java consumer program finds it, but lists none of its content, while a kafka-console-consumer is able to
It’s my first Kafka program. From a kafka_2.13-3.1.0 instance, I created a Kafka topic poids_garmin_brut and filled it with this csv: And at anytime now, before or after running the program I’ll show, its content can be displayed by a kafka-console-consumer command: Here is the Java program, based…
How to implement configuration to use oracle/postgreSQL dataSource with spring+mybatis framework?
Background: spring + mybatis + oracle data source Requirement: support postgreSQL data source exchange with minimum code change Example: Current: controllerA -> ServiceA -> daoA -> A.xml (oracle) Now need: we can configure use oracele/postgreSQL database source If configure use postgreSQL: controller…
Filter distinct groups and get average of String values parsing as Integer or Double
I have a POJO like below: And a List like below: Now I am trying to filter and group all the employees by department and need to get the highest spending department. If salary is of type Double (say) I can do it like below: And I get the expected output: But I am clueless what to do if I
Java Boolean method return is always false [closed]
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers. Closed 9 m…
Is there a way to @Autowire non overridden methods?
I have an interface that is implemented by multiple classes, and these classes also have some extra methods. If I autowire the class. Is there a way I can autowire these extra methods? Example- Interface Service 1 Service 2 If I try to directly Autowire the service like this- then I am getting error something…
Java 8 List from String and List of String
I want to generate a list of strings, comprising id and external ids, from a list of Bean. I got it using the below code, but here I need to do the stream twice. Is there any better way to rewrite this code? Answer Use Stream.concat inside the flatMap operation:
OpenLiberty JakartaEE 9: access TransactionManager
On Docker Image open-liberty:22.0.0.1-full-java17-openj9 with the following activated features: and the javax namespace, it was possible to create an TransactionManager via the api dependency in the following way: We are moving to JakartaEE9 and this one API dependency seems not to have an equivalent for the …