I have a question with regards to the question Time dependent unit tests Let’s say I build Spring application which contains service interface and its implementation If I want to change clock in test, I would have to “pollute” production code and interface with e.g. setClock method as follow…
How to peek on an Optional?
I want to use the fluent api of Optional and apply two Consumers to it. I’m dreaming about something like this: How do I apply several Consumers to an Optional? Answer You can use this syntax:
Hibernate Validator: Violation Message Language
I have a test class where I am testing a domain model which is annotated with e.g. @NotNull In my test class I am first getting the validator Later I have a JUnit Test where I am testing the domain model (lets say a Person) Lets say, I want to retrieve the first violation Message I do: I haven’t set
How to parse JSON String to java object with jackson?
I am currently having trouble trying to parse this VCAP_SERVICES to java objects. I do not quite understand how to structure the POJO to allow it to map the values from the json string. Can someone please help me structure my pojo so that it is aligns with the json string? I want to create objects for both of…
Fibonacci Memoized/Dynamic Programming in Java
So this is some code to calculate the Fibonacci sequence with memoization. What confuses me is when we check if memo[i]==0. I understand that Java arrays are initialized to zero and thus if memo[i] == 0 this may mean that the computation for memo[i] has not yet occured. However, one of the return values for t…
invalid column name in namedNativeQuery in spring-hibernate-jpa
I have very simple Entity class and two native query in it . QUERY1 is run right and return PersonEntity , but the QUERY2 return exception (invalid column name !!! but my column name is exactly this) ; MY ENTITY CLASS : DAO CLASS : EXCEPTION : Table Describe Answer The problem is that your second query return…
Spring deserializes a LocalDate in a @RequestBody differently from one in a @RequestParam – why, and can they be the same?
QUESTION: Spring appears to use different deserialization methods for LocalDate depending on whether it appears in a @RequestBody or a request @ReqestParam – is this correct, and if so, is there a way to configure them to be the same throughout an application? BACKGROUND: In my @RestController, I have t…
What is the equivalent way to do Ordering.lexicographical() in Java 8 Comparator?
Is there a way to implement Ordering.lexicographical() with Java 8 Comparator? Comparator.thenCompare seems to be limited in this Answer Seemingly not, no. As a result, Guava still provides this functionality, but in the new class Comparators: https://guava.dev/releases/snapshot/api/docs/com/google/common/col…
Spring boot app terminated at startup
I have created a spring boot project using spring initilizer. I use spring-boot-cli version v1.5.3.RELEASE. I just try to run: But my server won’t stay running, it is closing automatically. On port 8080 I have no other connection: LATER EDIT: Still not working. EDIT: here is the pom file: Answer I added…
WLS 12.1.3 in Linux – a message is not getting listened to by a consumer
I have deployed the code as a WAR file in WebLogic Server (WLS) 12.1.3 where I am sending a message from a Producer and the messages are consumed by the below code. The application is deployed as a WAR file in WLS server in Windows and it is listening, but the same WAR file is deployed with same version of