I am trying to upgrade my springboot version from 2.3.4 to 2.6.1. I use query dsl with jpa and apt-maven-plugin. My issue is that I can’t no more generate the QClasses when I run maven compile. I noticed that I am no more able to use an older version of querydsl (previous one 4.4.0 and apt-maven-plugin …
Tag: java
Data from test with @Transactional are persisting between tests
I have a small problem. I have started writing tests for my small project. The project uses SpringBoot, standard JpaRepository from Spring, as a testing framework I am using Spock and for testing the database, I’m using PostgreSQL container from TestContainers. The problem is, that data between tests is…
How to restore initial fraction from a big decimal
I have a list of fractions that have to be converted to a bigDecimal first and then converted to a fraction again. I have made two methods: first converts from fraction to bigDecimal and the second does the opposite. However, I have noticed that during the conversion I am losing on some precision, hence I was…
How to configure JmsMessagingTemplate to use MappingJackson2MessageConverter
I am looking at using JmsMessagingTemplate instead of JmsTemplate because I would like to use convertSendAndReceive. The messages should be send in JSON format. I am having difficulties convincing JmsMessagingTemplate to use MappingJackson2MessageConverter instead of the SimpleMessageConverter. The documentat…
JPA Entity for View containig joins and aliases
I have the following query using which I want to create an entity class for the columns which I am retrieving from the query. How to create an entity class from these columns and what variables are needed to take it in entity class to refer to these columns? Answer View is a virtual table based on the result-…
Exception in thread main Java
This is my program to print natural numbers from 1 to N^2 in a clockwise spiral. I’m getting the following error This is my program The code works fine for N=2 but starts giving this error for N=3,4 etc. If N=3, the greatest value of arr[i][c2] will be arr[2][2] which falls in the range of a 3×3 matrix. …
How to i compare two lists of different types in Java?
I have two lists: The first list is a list of MyObject which contains an int and a String: The second list is simply a list of strings: I want to compare the list of strings (personList) with string in the list of MyObject (myObjectList) and return a list of id’s with all the matches. So in the examle i…
Do I need synchronize method Scheduled method?
I have a Spring schedulled tasks which calls the same private method. Do I need to sync this method? Will I have the problem if shedulled tasks runned in the same time? Or will be better to extract it to the prototype component or separate schedulled classes or something else? Answer The default ThreadPoolTas…
to limit the limit count variable to fixed value
I want to execute some code based on value in limit count, but I want to limit its value to 20000 max. for eg if limit count passed is 50000 then run the code three times with values as 20000,20000,10000 also if limit count is 10000 then run it as is Answer I guess, you need smth like that:
Map a List to DTO inside map – java
I have such collection: Map<Integer, List<MyObject>> collection I would like to map the whole list of MyObject to MyObjectDTO and return the whole map with the mapped list. So return will be: Map<Integer, List<MyObjectDto>> collectionWithDtos What is the easiest and quickest way? IR…