Facing a problem with a practice app I’m working on. I’m facing a NullPointerException problem relating to the toString method. Being new to android app development, I’m unsure of the exact cause even after my research into this. Hence I ask for someone who is more familiar with the stack trace to kindly help me out. Note: The error occurs
Insert Dimensions to complete Expression/ReferenceType
I’m a newbie to Java. I have provided a short snippet from my code for BFS. public int bfs(Person p, Person q) { private HashMap marked; private int count; marked …
Integrating JaCoCo, Arquillian and REST Assured brings me a code coverage of 0%
I’m using JaCoCo, Arquillian and rest-assured to test my RESTFul API. The problem is that I’m getting a 0% code coverage within my JaCoCo report. I’m using a maven profile for test cases, getting a wildfly instance, deploying it on JVM, deploying my API and then running the tests. I’ve made some researches and reach the point where I know
How to handle transactions with concurrent access in Spring
I have a service with one method: @Service public class DefaultTestService implements TestService { private static final Logger LOGGER = Logger.getLogger(DefaultTestService.class); …
Jackson – Custom TypeId Resolver
I’ve been using a custom typeId resolver for one of my classes, so far I’ve been leaning on the annotation support: @JsonTypeInfo( use = JsonTypeInfo.Id.CUSTOM, include = JsonTypeInfo.As….
Display classes containing deprecation Android Studio
I updated my project to the latest Android APIs and the project now has multiple deprecated methods. Does Android Studio have a cool way of listing all classes containing said methods, such as the …
Cleaning up after changing the isolation level in JPA / EclipsLink EntityManager
I’m performing a transaction in JPA (EclipseLink) using a custom transaction isolation level, which I set on the underlying connection of the JPA EntityManager using this code: If I try to reset the isolation level to the old value after having committed the transaction, the underlying connection is null (entityManager.unwrap(Connection.class) returns null). I’m worried, if I just don’t reset the
When creating a Java class in IntelliJ: is there a wizard/menu to select the package and class to extend from?
One of the features I like of Eclipse is that when creating Java classes, a wizard is available to specify different properties for the class. Like its package, class to extend from…etc (see below in the screen cap). Does IntelliJ provide something similar? I created a class but the process wasn’t smooth. I had to…mark /java directory as Source Root…create
Anchor-like functionality in Vaadin to jump/scroll to a certain point
Is there a way in vaadin to scroll or jump to a certain point (e.g. a Label) inside a view (e.g. a Panel)when a button or link component is clicked? Similar to the anchors functionality on a website? …
How to stop and start Appium server programmatically using Java?
How can I perform launching and stopping my server using Java code? Currently I am doing this process manually.