Or-tools java.lang.NoClassDefFoundError: com/sun/jna/Platform - java

Hi I'm trying to run this sample code on my eclipse ide and have manually adding the jars file without using the pom file provided but it's complaining with this error.
I managed to compile and run the sample code using 'make run' command.
Any idea is it possible to copy the library jar files and use it in my own project in eclipse?

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Minecraft Plugin and JSoup.jar

I'm creating a Java Project in Eclipse, write some parser, which gives a random names with use a JSoup Library and when i started a server it gives me a error java.lang.NoClassDefFoundError: org/jsoup/Jsoup. Eclipse files.
I also use Json-simple and everything is fine with it. JSoup is added as an external JAR library, and the error occurs only when I use Jsoup.connect().get; that is, the imported org object.jsoup.nodes.Document does not cause errors.
P.s. I looked through my plugin using 7-zip and there is JSoup.jar in the libs folder, which means that the plugin is correctly assembled in a vmset with libraries.
You don't have your libraries in the server.
To fix it, you can:
Add them in the compiled jar. To do this, just check compilation options, or convert your project as maven or gradle
Use another plugin that implement them.
Load library jar from your plugin such as explained here or here

Scala code run successfully in Eclipse but its jar not run

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I have Scala project with SBT, its run well in Eclipse but when I try to run jar file which is generated after packaging is not running its throw error like
SBT version= 0.13.8 ,scala version =2.12.2 ,java=1.8
Click here to seethe Error
click to see the build.sbt
Please co-operate me to solve this issue
This Error due to then dependency is not included in the jar file at the time building the project , so its throws ClassNotFoundException , we can fix this issue by assemlying the dependency into single jar . for this solution please follow the below link
https://alvinalexander.com/scala/sbt-how-build-single-executable-jar-file-assembly/

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I have included libraries using File->Project Structure->Libraries:
In Artifacts, I made sure to include the library in the output JAR file:
When I run the program inside IntelliJ, it works fine. However, when I try to run the JAR file it generates, it displays a NoClassDefFoundError:
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There are different ways of how to package the application. For example create an exe or add the necessary jars to the classpath.

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