Is there a way to smoothly run side-by-side projects, each using different Java versions, in IntelliJ (v2022.x+)? For instance, I am using IntelliJ to work on two projects. One project is in Java 11 and the other is in Java 17 – each project has its own IDE instance. Each project is configured to use th…
Tag: java
How does parameters of a method get stored in stack during a recursive call?
I was doing a leetcode question https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree-ii/ and I am confused on how parameters for a method get stored during a recursive call. If a node gets visited, I wanted to save it’s state that it was visited. When I send two variables, when the stac…
Sort a List of objects based in its Sublist method size
I’m trying to make my own “Facebook reaction bar” and I got into a problem, I need to sort a list of objects based in its sublist method size, let me explain! I have a ReactionModel which has a property “usernames” which is a List of Strings of usernames of those users that used …
Spring SQL: org.h2.jdbc.JdbcSQLSyntaxErrorException: Syntax error in SQL statement “; expected “identifier”, when using INSERT INTO
I am working on a Spring Web Application. I am using mysql database, but for my unit tests, I want to run them in H2 database. Test specific application properties: As you can see, my database is in MODE=MYSQL, since my data.sql is in MySQL dialect. But during initialization of of data.sql I get this error: I…
String input of weekdays in German to Localdate
I have a string input of weekdays in German and need to get the next Localdate after today which corresponds to the given weekday string. If for example the input is Montag (Monday) I need the output as Localdate of 2022-05-16 which is the next Monday after today. If the input was in english I could do someth…
How to properly use Exception method getMessage
I have the following java code: how can I set e.getMessage() so that System.out.println(e.getMessage()) will print “Pretty please enter an int: ” Answer You only set the message when the exception is created, it’s an argument to the constructor. In your case it would have been nice if the In…
Using Optionals correctly in service layer of spring boot application
I new to spring boot application development. I using service layer in my application, but came across the repository method that return Optional as shown below. My question is , whether I am using the Optional correctly here. And is it ok to check this optional (isPresent()) in the RestController and through…
Null pointer exception while running selenium test. I am using Page object model
Below is my Testbase class: My VerifyLaydownlogintest as below: And this is my Login page class: This is error of NPE: I tried to resolve this but unable to find the root cause. Where am I going wrong? My config.properties Answer You are using TestNG as your test automation framework. In TestNG, execution wil…
Return link from Hateos
I have this old Spring Hateos code which I want to migrate to the latest version: I tried this: I get error at this line: Can you advise what is the correct way to implement this? Answer Based on your comments & question for migration this is what I am suggesting: …. //calling addLinlk And inside ad…
Overriding transaction propagation levels for methods having Spring’s @transactional
I have multiple methods in my codebase annotated with Spring’s @transactional with different propgation levels (lets ignore the idea behind choosing the propagation levels). Example – Now I have a new use case where I want to perform all these operations in a single transaction (for this specific …