My environment Java 7/JPA 2/Hibernate 5.1. My Scenario I’m building a Repository pattern implementation. All code is written and it all works fine when no error condition happens. However, let’s say that three entity instances are added to the repository. First and third are ok, but second lacks v…
Is it possible to split request params in Spring controllers?
I have a request like: I would like to split those params to bind a List<String> sort in my controller or List<SortParam> where SortParam is the class with fields like: name (String) and ask (boolean). So the final controller would look like this: or Is there a way to make it? UPDATE: The standard…
How to map an OptionalLong to an Optional?
I have an instance of OptionalLong. But one of my libraries requires an Optional<Long> as a parameter. How can I convert my OptionalLong into an Optional<Long>? I was dreaming about something like this: Answer I don’t know simpler solutions but this will do what you need.
Disable Spring Cloud Sleuth when running Integration Tests?
When using org.springframework.cloud:spring-cloud-gcp-starter-trace:1.0.0.RELEASE and running my integration tests locally I get this error message: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘stackdriverSender’ defined in class path resource [org/spring…
zScore and p-value in Java (survival function)
What would be the java equivalent of the following code? Answer And the answer is: This is using The Apache Commons Mathematics Library EDIT: Or, even better:
Find top k frequent words in real time data stream
I am trying to solve an algorithms problem using java tree set. The problem as follows: Find top k frequent words in realtime data stream. Implement three methods for Topk Class: TopK(k). The …
MongoDB how to count array elements with Java driver
I need my application to count the size of an array foos inside a document using Java driver 3.8. I know I can do this with the shell but I have no idea of how to do this with java, because the only method producing a $size operator I found is Filters.size(String fieldName, int size) that is meant to look
How to create a Queue which accepts any Datatype?
How to insert both String’s and Integers in the same Queue ? Please look at the below program, I have created two objects (q, q1). Can we insert strings and integers in one Queue? import java.util.*;…
android studio ‘javah’ is not recognized as an internal or external command
Following this tutorial to use Opencv Face Detection. At 4:00 he wrote on terminal: C:UserscvlabDesktopMyApplicationappsrcmain>javah -d jni -classpath ../../build/intermediate/classes/debug com.example.cvlab.myapplication.OpencvClass I’m trying to wrote the same path on my code but I’m running …
Passing parameters from Java to Python using Jython
I am passing string values to a python script using Jython. In my program, I do this several times. However, during a test I am running to see if the class that sends the parameters is working properly, I see that the python script outputs the same string values as the initial inputs. Here is the Java class: …