I am trying to understand how the Session scoped bean work and have tried the example from here. HelloMessageGenerator.java HelloMessageBean.java HelloMessageController.java When I go to http://localhost:8080/scopes/session I get an error. scopesExample.html The error I am getting is as if the mapping would n…
Tag: java
How to avoid casting when accessing subclass variables from ArrayList of type superclass
I have a parent class Item, and a subclass HealingItem which extends that – for this method I want the player to be able to only access the HealingItem’s in the ArrayList of type Item. Is there a more efficient method of performing this action which perhaps doesn’t involve continually castin…
Is it possible to define the gradle publish task to public?
I have a Gradle 7.0 publish task defined in my Java Spring boot project sub module build.gradle file like this: It works fine in each of my sub module. The only problem is that this code snippet must be copied to each of my sub module. Now the sub module increased more than 50+. I have to copy and paste
Is the Kotlin term “mutable” wrong?
The way I understood things is that the word “variable” referred to the capability of a reference to be reassigned. “constant” meant a reference cannot be reassigned. Essentially the difference between final or not in Java. To me “mutability” meant the ability to modify the…
Java 8 Streams Map Reduced Value after Group By
Using Java streams, I would like to calculate the cost given a list of items, grouped by type. After getting the cost, I would like to map the BigDecimal to a formatted currency String. Is it possible to map reduced and grouped values? Answer You can wrap your reducing collector in CollectingAndThen collector…
Testing @PreAuthorize annotation with hasAuthority()
I am trying to unit test my apis that have @PreAuthorize annotation. I am getting the cognito groups from the Jwt and using them as authorities. I check the same in the preauthorize annotation in the api methods. UPDATE: I get the 404 No mapping Delete profile/VOlUc3F5A_test.txt exists Test class: Controller …
Two bidirectional association at the same entity – Column cannot be null
I have a scenario where I have a relationship between two tables. One being the step and the other being to know who is the next step. select * from cpo_workflow_step_control; Step entity: Step_Control My problem is, when I try to save a Step, with a Step_Control associated, JPA tries to save everything and i…
(Java) How can I make a loop that will assign random names I’ve generated from an array to multiple strings?
Relatively new to Java, looking for a solution to a crucial part of a game I’m making for a class. The idea is to make a very simple stock market simulation game, but the problem is related to creating made-up company names. I have three arrays for the first, middle, and last names of companies. I’…
How to return the same generic Collection-type with different element-type?
I have a method, that maps elements of a collection to other object and returns a collection containing the mapped elements. I want the returned Collection to be of the same Collection-type as the input Collection, but with a different element type. My method would look something like this: Obviously the part…
Spannabe String text from Bundle getExtras
In my notification listener, I m not able to get value for keyvalue [android.text] when the notifications are received from gmail. It is working fine for most of notifications, but for gmail, it throws exception as below. Below is how i m fetching value of text since we do not have any method for extracting S…