jep | Jenkins Enhancement Proposals | Icon library

I use Java 11 (AdoptOpenJDK), keytool uses PKCS12 by default since Java 9, I need a PKCS12 keystore for Jetty 11. Let's Encrypt gives me two pem files. Therefore, I convert those 2 pem files into a PKCS12 keystore with OpenSSL and I use keytool as advised in a tutorial:

I am having those two classes in Eclipse 2020-09 and 2020-12:

Class A

I've observed that in the JShell session, not only package "java.lang", but quite a few other packages (that are not imported automatically in the Java class files, e.g. LinkedList, Math and several other types) seem to be imported, by default.

I wonder, what other packages are available, by default, in the JShell session, and what motivates this distinction from the normal class files?

I could not find anything on JEP 222, neither the motivation of this auto/implicit import , nor the documentation of - what is actually imported.

Thanks for all trying to help :)

Backround information:
I use the spring framework version 2.4.3 together with Java (and Maven)

To my question: Is it possible to shorten http://localhost:8080/api/v1/example?admin=true&superPrivilege=true to something like http://localhost:8080/api/v1/example?admin&superPrivilege.

So what I want is to use boolean Parameters as Flag.
If the parameter is set then it counts as true if not as False. Is that possible in Spring Boot?

I actually don't know what to google for because I'm new with any kind of Webdevelopement.
(And jep I did try a couple of hours in the last days xD)

I'm trying to reproduce in SSIS a simple inner join:

Recently I was just creating another enum type. I took advantage of the fact that in Java, an enum is a special type of class (and not a named integer constant, like in C#). I made it with two fields, an all-arg constructor and getters for both fields.

This is an example:

I recently made the decision to switch over to a newer version of the JDK from the one I was using. (Specifically from jdk1.8.0_261 to jdk-14.0.2). This upgrade when pretty smoothly, as most features work the way I expected them and I was able to find how to adjust to anything that was not the same.

However, as shown in the title, I came across an issue with a specific application I am writing that uses Swing. My main monitor is a 4k monitor, and I have set the windows system scaling for that monitor to 200%. While every other Swing application being scaled to match that DPI setting is nice, for this specific application I want to disable that scaling and have pixels be drawn 1:1, especially when this Application is distributed.

Is there a way to disable this automatic scaling with a VM argument? Or is there a way to disable the scaling at runtime before any calls are made to the swing library? (Similar to how any changes to the look and feel must be done before any other calls to the library.)

For reference:

Here is the code I use to create my JFrame and to create the graphics object I draw everything onto, which happens in a timed loop outside of this class and the scope of this question.

As Java 15 rolled out recently, I was reading about the new features and APIs supported by it. Java 15 has "sealed classes" and "sealed interfaces" (JEP 360: Sealed Classes (Preview)) as a preview feature.

They have provided classic examples like Shape -> Circle, Rectangle etc.

I understand sealed classes: the switch statement example provided makes sense to me. But, sealed interfaces are a mystery to me. Any class implementing an interface is forced to provide definitions for them. Interfaces don't compromise the integrity of the implementation because the interface is stateless on its own. Doesn't matter whether I wanted to limit implementation to a few selected classes.

Could you tell me the proper use case of sealed interfaces in Java 15+?

I have a simple Runnable implementation in Java 15.