I have researched the internet extensively but still cannot figure out how to properly import a GitHub source code library into my java project in eclipse and use it successfully. I can do this perfectly if the library is in a jar format, but I don't know how to do it with source code provided in GitHub. I have tried everything from maven to downloading a zip file with the source code and manually putting it in my code (I know this is terrible practice). It seems like the library I am downloading references other libraries and this chain seems to go on for a long time.
I have had trouble with all libraries but this one is an example: https://github.com/thiagolocatelli/parse4j
I am relatively new to this kind of stuff, so can someone provide a detail step by step guide on how to do this?
Thank you so much!
Akarsh.
Download the parse4j github project into same directory as your project. Refer below screenshot
add <dependencies></dependencies> section of the pom.xml of your project, in the above image, it's jparse.
<dependency>
<groupId>com.github.thiagolocatelli</groupId>
<artifactId>parse4j</artifactId>
<version>1.4</version>
</dependency>
Now you will be able to use parse4j classes in your project.
Related
I am very new to programming, and while working on my first software development project I came across the error: "package javax.activation is not visible." I have read other posts that have said that in order to fix the error, one must add a dependency to the module path?
Because I'm just starting out, I really don't know what this means and how to go about that, and was wondering if someone could point me in the right direction? Thanks in advance. (I'm also using JGrasp if that matters)
Broadly speaking, a dependency is code (often written by someone else) which your application needs to compile.
A dependency in your case, is a java library which has classes that need to be on your class path. You can find more about class paths here: https://docs.oracle.com/javase/tutorial/essential/environment/paths.html. In order to overcome error mentioned in a question, you need to have javax.activation module dependency on your class path.
You could do it in few ways. In the majority of IDEs (in your case we are talking about JGrasp) there is a way to add a dependency to the project directly. Then, your IDE would compile the code with given dependency on a class path and problem would be solved. And that would be the first and most beginner-friendly way, unfortunately I haven't a faintest idea about JGrasp so I'm going to focus on other solutions.
The second way you could do this is to build your program with build automation tool, such as Apache Maven or Gradle. You should definitely check those guys out, as they are insanely useful when it comes to building Java code and, sooner or later, you will probably start using them anyway. Let's say you have chosen Apache Maven. In your project you would then have a pom.xml file and you would simply look-up the needed dependency in Maven Central repository, add it to your dependencies section in pom.xml file and build the application. Your pom would look something like this:
<project>
...
<dependencies>
<!-- https://mvnrepository.com/artifact/javax.validation/validation-api -->
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>2.0.1.Final</version>
</dependency>
</dependencies>
...
</project>
Of course Apache Maven is not a lightweight tool so you would have to take some time to learn how to build code with it. I recommend starting with this tutorial:
https://maven.apache.org/guides/getting-started/maven-in-five-minutes.html
I also encourage you to get your hands on Apache Maven docs, as it is quite readable and transparent.
And the last way I can think of is to manually compile your application and include the required dependency during the compilation process. There are plenty of tutorials on SO that tell you how to do this, so I'll simply summarize and indicate the resources. What you need to do is to find the required dependency jar package. You will want to search the maven central repository (see: https://mvnrepository.com/) and from there download your .jar file. The next thing you need to do is to learn how to compile your Java code to .class files including the downloaded jar. To acquire such a wonderful skill, please see this one: How to include jar files with java file and compile in command prompt
Amongst those three ways, the recommended one is to get to know with build tools such as Apache Maven or Gradle. Hope I helped you! Good luck
This is a really basic question. I'm a college sophomore and I have no experience downloading APIs to use with Java, but I'm working on a personal project in which I need to be able to read in Microsoft Excel files. I'm trying to download Apache POI, which I saw recommended here. I might just be dumb, but I can't figure out where I should be downloading it to or how to verify the integrity of the files, which the download page says it "essential".
The download page is here: http://poi.apache.org/download.html#POI-3.17. If someone could just give me an idea of how to do this, that would be great, because I'm sure it's a skill that will help me in the future.
True. you are a beginner to world of coding. So try to take things one at a time and also would help if you inculcate good habits in the process.
To start would, would recommend to download an IDE (Integrated Development Environment), which would assist in you writing the code with ease. (http://www.eclipse.org/downloads/packages/eclipse-ide-java-ee-developers/oxygen2)
Next google up about Maven (alternatives are there like gradle, ant etc.). Think of this as App store on Mac. You can give details about what you require and it will take care of downloading and putting them in your project class path.
Create your first Maven project in Eclipse (https://wiki.jasig.org/display/UPM32/Creating+a+Simple+Maven+Project)
Last add the POI dependency to your pom.xml file (configuration file where you define which java API's you want to download and use in your project, like a shopping cart for JAVA good). The maven dependency for POI is something like follows.
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
Now you are setup to have a good crack at your problem.
Just download the zip file, and uzip it. Then put the .jar file in on the Java classpath. A better option would be to use Maven or Gradle, and add POI as a dependency. This will auto download, and verify the dependency.
Maven Central - POI
Intro to Maven
Intro to Gradle
I've tried every option explained step by step here and here: and here
And I can't get it to work.
What I want to do is pick this project: , however it may be done (I've tried both through maven and git), and use its code in eclipse. And what I mean by that, is that I get to the point of seeing the folders in eclipse, but I can't create packages since it's not a java project, and if I mess up the code on the files that appear, it doesn't give me a warning nor in general interacts with said code.
So I guess I'm missing some piece of knowledge and I don't know where else to look for it. What should I do to use that project in my eclipse, and create my own code that calls and uses the classes and methods from said project?
Thank you in advance.
Just download it with git, then import it as a maven project. If this fails, create new "java project from existing sources", pointing as a source the simmetrics-core/src and simmetrics-example/src directories. If it fails, point separately simmetrics-core/src/main, simmetrics-core/src/test etc.
Since this artifact is present in the maven repository (https://mvnrepository.com/artifact/com.github.mpkorstanje/simmetrics/4.1.1), you can create your own new maven project in Eclipse and add simmetrics as a dependency to it in its pom.xml file
<dependency>
<groupId>com.github.mpkorstanje</groupId>
<artifactId>simmetrics</artifactId>
<version>4.1.1</version>
</dependency>
This will put simmetrics to the classpath of your own project and you should be able use its API
I am following an online tutorial, and am stuck trying to get Spring libraries to run things with. The instructions are either a little out of date or assume I know how to do things in a Maven world that I do not.
They give web addresses on the Spring site from which they say I can "download the jars". But you can't download jars from any of them; evidently what you can do is find pom.xml fragments and use them to download jars. If you know how.
For example: the tutorial says:
Finally, following is the list of Spring and other libraries to be
included in your web application. You simply drag these files and drop
them in WebContent/WEB-INF/lib folder.
commons-logging-x.y.z.jar
org.springframework.asm-x.y.z.jar
org.springframework.beans-x.y.z.jar
org.springframework.context-x.y.z.jar
org.springframework.core-x.y.z.jar
org.springframework.expression-x.y.z.jar
org.springframework.web.servlet-x.y.z.jar
org.springframework.web-x.y.z.jar
spring-web.jar
I love the "simply" here.
I have many but not all of these (version 3.2.4). I have googled the library names and used jarfinder for the ones I don't have, but haven't found them all. It seems to me I'm flailing around a bit, just trying this and that until something works. I hate that.
I'm hoping someone can give me a set of steps I should follow when faced with this sort of thing, since we're faced with it all the time. Do I need to stop my current study of programming and learn Maven inside and out so that I can configure the bloody system so I can program again?
Is it a maven project you have?
If so in the pom.xml you just need to place the “pom fragments” in the xml.
i.e. between the dependencies tags. For example,
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
</dependency>
</dependencies>
Once you have done that run maven install. Under Eclipse it is: run as > maven install.
That will download all the dependences i.e. jars you have listed into the you local maven repository.
I think the default is C:\Users\yourName\.m2\repository
Found most of the needed jar files here:
http://www.java2s.com/Code/Jar/CatalogJar.htm
while I downloaded commons-logging here:
http://mvnrepository.com/artifact/commons-logging/commons-logging/1.2
My advice is, stop study you program language, Java I guess and learn how to integrate maven dependencies of Spring in your Maven project.
http://spring.io/blog/2009/12/02/obtaining-spring-3-artifacts-with-maven/
You cannot start the house from the roof
I'm trying to add an embedded database to my application, but I have no clue where to begin. So far I've found that I should download the sqlite-jdbc driver and add the .jar to my project. From there I'm kind of lost, are there any good tutorials to get me started or some helpful tips?
Also, I'm using Eclipse for my IDE, so if there's anything within there that will simplify the process, feel free to add that as well!
You want dependency management here? Read up on Maven (very easy), write a Maven pom.xml file and load it into Eclipse that way. Eclipse and NetBeans understand Maven very well now. No need to learn an Eclipse-specific way to do this since Maven will work as well in NetBeans as Eclipse and is simple to run on the command line too.
Based on what search.maven.org says, your dependency in Maven would be this added to a standard pom file to get the latest:
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.7.15-M1</version>
</dependency>