I’m trying to import data from a CSV file. I don’t have any issue about the importing process. But, when I’m passing an imported array from the CSV file to another method in another class, I can not get and print the values from the array. I got the following printing: [1, 2.0, [[Ljava.lang.…
Tag: java
Unable start activity, FATAL EXCEPTION: main [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 10 …
Java 8: Child should inherit methods from parent but return itself (FluentApi)
I want to do Inheritance with the concept of fluent api. So the parent Class is defining its methods and return itself (this). The child should be able to use this methods but return not the parent but its own class instance! How can I achieve this? I want to instantiate the parent, so abstract is not a optio…
why nano seconds have to use int instead of long in java
I have been doing this exercise and this is the code Doesnt nanoseconds have to use long instead of int because the nanoseconds in the range? Answer That’s because like documentation says, we have a duration which consist of two fields, one is seconds and the other one is nanos. So when you ask for dura…
Convert date format in springboot using java8
I receive the following date format How can I convert it into the following format in java 8 Answer You can use Java 8’s date/time API, and more precisely the DateTimeFormatter. There’s no pre-defined formatter that matches your initial input. The closest is DateTimeFormatter.RFC_1123_DATE_TIME, b…
Spring Boot Security using http instead of https when forwarding to login page
I am using Spring Boot Security with a custom AuthenticationProvider to secure a Java Spring Boot application. Attempts to access the application via a browser are directed to a custom login page. The body of my security config class is pasted below:- This all works fine when I run my services locally within …
com.typesafe.config.ConfigException$Missing: reference.conf: No configuration setting found for key ‘default’
I created a jar file of my Akka application. When I run the jar file by the command java -jar file.jar then I see this error. What could be possibly wrong and how can I fix this? Answer This kind of error happens when the application is unable to found the reference.conf configuration file in the classpath. M…
How to save array of object in sprig boot with crudrepository?
I am very new to Spring boot and this is my first spring dummy project where I’m trying to learn to save an array of objects in mysql-db. Actually, I am trying to use the saveAll method from the crudRepository in my controller. But it’s giving me an error no instance(s) of type variable(s) S exist…
How to pass parameter to a @Component class which can’t be autowired in Spring Boot
I am building a desktop application using JavaFx and Spring Boot and I am stuck at some problem I have @Component class Translator which extends Task<String> and makes an api call to google translation api and I want to pass an autowired bean class and some string parameters such as source and target la…
Mocking an object returned from private method in java
I have a requirement where i want to mock an object that is return from private method. I am working with junit and mockito in my project. I can not paste the actual code here but sample code will look like this. Limitation here is that the code is legacy one and I can not refactor as of now Class