I have a boolean Java statement that is structured like follows: return A AND (B OR C OR D) In Java: I wanted to reformulate this by using chained predicates, but it seems like I have to use the distributive law of Boolean algebra in order to make it work: (A AND B) OR (A AND C) OR (A AND
Deserializing json to pojo where json field has different data types
I’m trying to deserialize json to java pojo and I can’t wrap my head around how should I begin to create a java object that could be used to deserialize json like this: I’m working with jackson and looking to use something like this: MyPojo response = mapper.readValue(jsonString, MyPojo.class) The biggest struggle is those “value” elements, where some fields contain
Regex to find strings that start and end with letter
I need to write a regex that checks if: string starts and end with letter contains only letters, numbers, _ and , _ can be present only between 2 letters, 2 numbers or a letter and a number , can be present only between 2 letters What i have until now is this: ^[a-zA-Z][(a-zA-Z0-9_)(,a-zA-Z0-9_)]*[a-zA-Z]$, but I don’t know how to
Should we use Spring @Bean with static method?
Is this a good practice to use @Bean with static method? Answer Generally speaking, there’s no need for @Bean methods to be static. When a @Bean method is not static, creating the bean requires an instance of its class, FooFactory in your example, to be created first. The vast majority of the time this is fine, but it can sometimes
PDFBox with special characters working fine on Windows but characters getting replaced with other characters in Linux
My requirement is that I have a PDF Acroform Template with few text fields and based on logged in user these text fields are prepopulated with user’s name and city and is presented to the user (Note user is not manually entering data into PDF but my backend code is doing this). so these name and city fields are giving
What happens in the memory and does a new process always open a new JVM in Java?
What happens in Java when we start a new process using ProccessBuilder.start() or RunTime.getRunTime.exec()? Will it open a new JVM with a new stack & heap of the new process? Does a new JVM is …
Why it will still appear “Incorrect account or password or user type” after I login successful？ [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 1 year ago. Improve this question I’ve tried but just can’t figure out why, thanks for helping if there
Can’t start Spring Boot because of the class mapping
I was trying to start an Spring Boot application, with a simple class JPA mapping and H2 database, but every time I try to start the application, I have the same class error at the same column. Class with error: Error logged: The column that is with error is a table and already mapped: My H2 configurations: I tried to
Return Twitter’s Future within a certain duration
According to Twitter Util’s Future documentation, Future.within() or .by() “Returns a new Future that fails if it is not satisfied before the given time”. I was trying to use this, in Java, …
AWS – Ubuntu User Session Stops Spring Boot App
this is my first deploy on AWS. I have a Spring Boot API on an EC2 AWS instance. To run my API I run the command ‘java -jar app.jar’, this works for a while, but when the session for the ubuntu user is logged out my API stops. Then I have to run the command ‘java -jar app.jar’ and so