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Is there a way to compile the JDK from sources?
And is there an official download of the source?
I want to compile it for my Smartphone.
The question is completely valid. JDK has multiple repositories (forest), code form only JDK repository will not work to build complete JDK. Also, it's very hard to get a source of an older version.
Please refer to the following document to build OpenJDK.
https://hg.openjdk.java.net/jdk-updates/jdk9u/raw-file/tip/common/doc/building.html
Following is main steps to build code:
Download the code from the root repository. Please check this link for all available repository tree.
Run the get_source.sh script located in the root repository to get
the other needed repositories
Then follow step provided in README file in the root repository
Also if anyone wants to have prebuilt binary then it available via adoptjdk project at the following URL.
https://adoptopenjdk.net/archive.html
Updates: 5 Feb, 2021
As part of Project Skara, openJDK source code is moved from Mercurial to Git. Please refer following new guideline to build JDK11+.
https://openjdk.java.net/groups/build/doc/building.html
The JDK is already the compiled source and has all the source files inside of it. Some are only class files but most of java is open source.
However, you can check out openJDK.
http://openjdk.java.net/
Thats basically the version of java you want to get hacky with.
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We have to do java project like a management system and we have source code but the question is how to run it and where? anyone knows?
Queries
IDE
How to run it?
If you already have the source code,
Open a command prompt window then cd to the directory where you saved the java program.
For example, JavaProgram.java is in C:/
Type 'javac JavaProgram.java' and enter to compile your code.
Now type 'java JavaProgram' to run your program.
You will be able to see the result printed on the window.
Good luck :)
we have source code
You'll need to compile it.
Then you need to execute it. That could involve web containers with WAR or standalone, executable Java JARs, or directly execute a class file. Without seeing your code it's hard to answer that, but you wouldn't use an IDE to actually deploy/run your code outside of individual development.
You'll also need some server to run it on. That's not unique to Java.
Regarding the original question: "Make a project" - you could use Maven Archetypes or Spring and Quarkus have project starter websites, for example...
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I'm learning spring before I learn spring-boot I wish to install spring from Spring.
I have downloaded and unzipped, I need help as to where to place the folder so I can start working using a import org.springframework.stereotype.Component on a Mac. I know this is trivial question but I haven't found an installation of this kind, majority of the tutorials use spring.io to generate a zip file, or use maven to do the installation.
Looks like you need to use a build tool like Maven or Gradle to have the ability to add Spring Core to your project.
otherwise, you need to download the jar file and add it to the classpath.
Firstly let me tell you about CLASSPATH, according to the oracle website The Classpath tells the JDK tool where to find third-party and user defined classes that are not extensions or part of the Java platform.
On a Mac you need to type echo $CLASSPATH to see if you have any CLASSPATH set up, if you have never worked with third party classes this will be blank.
To add to CLASSPATH run the following command in the terminal
export CLASSPATH=/Users/{Path} this will clear all the classpaths , if you want to add to existing classpath run export CLASSPATH={$CLASSPATH}:/Users/{Path}
You can find a detailed article on this topic here
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I want do program like here: https://www.youtube.com/watch?v=hP2x1fwYP6c&feature=youtu.be&t=359
and I would like to import org.apache.commons.codec.binary.Base64; but java unknown apache
Or do I have to upload a library?
Thank you
You need to add the Apache Commons Codec library to your project. You either need to download the *.jar file and add it to the project folder and project configuration or you let your build processor automatically download it.
See https://mvnrepository.com/artifact/commons-codec/commons-codec/1.9
Latest is version 1.15
This website provides a download link for the *.jar file as well as configuration settings for different build processors (Maven, Gradle, ...)
org.apache.commons.codec.binary.Base64 is not part of the default java language, it is part of a library.
To use it you have to put said library on the classpath.
If you use a build and dependency management tool like maven you can add it as dependency in the pom.xml file.
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Hello everyone I have downloaded CalendarFX from github and I'm trying to build it to obtain the .JAR files but I haven't been able to make it work someone could help me? It would be very helpful thank you. Here is the link of the github repository: https://github.com/dlemmermann/CalendarFX#building-it
I'm using Eclipse by the way.
The directions on the Github repository are simply telling you to install, but it isn't explicity stated that you are supposed to do it with Maven. The pom.xml file (stands for Project Object Model) is fundamental to Maven projects.
Using command line, change directory to path of this project, then:
mvn install
... assumes you have Maven installed.
Finally, as stated on the repository's readme:
Once completed you will find the installation inside the target folder of the assembly module.
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When do we need to attach source to a jar?
Can we debug without attaching the source code?
Can we see the stacktrace line numbers without the source (AFIAK we can't)?
What is the best practice for local builds? Do we need the source code?
What about CI?
Can we leave the source code only for production release?
Thanks,
Omer
It's good practice to also publish the sources jar along with your binary jar in your internal (or external) Maven repository. It makes life of the developer that is working with your code much easier since they can see your comments / browse the codebase and be able to have all that at debug time. Now as you are saying even if the sources jar is not published, developers have ways around it primarily relying on their IDE. In Eclipse for instance you can install the Java Decompile plugin that would give you access to the code during debug time or on IntelliJ there is something similar without the need of installing a plugin.