The entity relationships are – A student belongs to one college And a college can have multiple students. So there is ManyToOne relationship between Student –> College And a OneToMany relationship between College –> Student. The entities are as below. and 1) I am using the below jpql q…
Tag: java
How to save an image using JFileChooser
Background info: I’ve made a program that uploads an image using JFileChooser and have made fill in the space of the JFrame. My Question: I’ve attempted implementing my method on a save button and so far I can pull up the JFileChooser but it will not actually save the image. So how would I go abou…
Xamarin View – How to put TextButton at the end and to the foreground
I am trying to figure out. How I can put the Login-Button at the end of the view, but on the foreground of placeholderText. This green textfield should be replaced by a maps-view later. My current code: and my current state looks like this: My targetview should looks like this: It would be great, if somebody …
Understanding how to model UML Class/Database
I’m confused with designing a client software with database integration to what should be a member variable of the class or just a query to the database. Let me be specific with a trivial example: If I have, lets say, a Student class, which has a list of “friends” that are Student objects. S…
Try-with-resources – Does it automatically close the connection? Java
I’ve been working on a SQL utility and I am trying to set the parameters inside a prepared statement in multiple functions. To lessen the code, I have a function that returns a prepared statement where all the params are set. My question is: Does the connection reference in the configureStatement() get …
Discord webhook returnes error when called from Forge mod
What I want is to send a file over a discord webhook using java code. I created a perfectly working code using the knowledge I gained from this stackoverflow post about curl requests in java and this Discord webhooks guide about sending attachments. The problem is, if I call the exact same code, that works pe…
Android NavigationDrawer and Toolbar in all fragments, plus TabLayout into one
I would like to create an Android app that uses a navigation drawer which loads different fragments, all of which include a toolbar/appbar and one that also has a TabView with ViewPager2, something like this: So I started a new Java project with Android Studio and chose the Navigation Drawer Activity template…
Casting a long javax.servlet.jsp.jstl.sql.Result to list of Strings is very slow
The for loop at the end of this is very slow when there are 50k rows. Is there a quicker way to get a list of Strings from the rows of a javax.servlet.jsp.jstl.sql.Result? Use a different collection? Convert the Strings differently? The query is absolutely fine. I am not including here the custom objects that…
Fix OWLOntologyStorageException
I’m developing a Java application using owl-api. For testing I want to use a TestDataProvider to provide test data for unit-testing. I’m using version 5.0.0 because the tutorial I read is using this version too. I plan to update later. But I run in following exception at the last line of addOWLInd…
Eclipse not giving warning when running java code which has compilation errors
When running a Java/Spring code, If the application has compilation errors we get a popup warning as ” Code contains compilation error..Continue running “. There is a checkbox there as ” Do not ask next time” I ticked that and allowed, Now Even if my large Java/spring applications cont…