How to use org.apache.commons.lang namespace in Java? - java

I tried in Eclipse to use org.apache.commons.lang.NotImplementedException, though it seems from what I can see both from IntelliSense and the Package Explorer, that that namespace does not exist.
So I guess I must load some other package(do you call them libraries in java?) than those it loaded by default.
This is my current setup: (link dead)

Download the commons lang library and add it to your eclipse project library.
EDIT (2016/02) : it seems that nowadays the .jar files are not provided as is. You have to get the "binary" archive (e.g. "commons-lang3-3.4-bin.zip") from the same download page and extract it. The required jar files are inside the extracted folder.
To add the jar to your eclipse project library:
open project properties
choose Java Build Path
tab to Libraries
add jars (if the jar is inside your project folder)
add external jar (if the jar is outside your project folder)

You need to add Apache commons jar file to the project. You can select the jar you want from here - http://commons.apache.org/downloads/index.html
for lang you need this - commons-lang-2.5.jar

Related

Add jar library to eclipse project for exporting

I have a library called Snakeyaml.jar, and I want to add it to my eclipse project, so it will be included in my jar, when I export my project. So far, I only see ways to add an "External Jar" which only adds a jar library to the buildpath, and does NOT include it in the program when being exported! How can I do it, and do I need any plugins for that? Please help!
Thanks.
Adding the jar to your build path is for compilation and runtime, but from eclipse only. A common misconception is that jar files can be added into other jar files, which will never work. What you probably want is extract your library jar into your exported jar. To achieve this:
File - Export
Expand Java node and select Runnable JAR File
In the library handling section, select Extract required libraries into generated JAR
Reference:
http://help.eclipse.org/juno/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Freference%2Fref-export-runnable-jar.htm
While exporting you can chose the File->Export->Runnable Jar Option . Then use the selection like below screen i.e Extract required libraries into generated jar
Okay, so I understand what you are actually asking! You want the Snakeyaml.jar file inside of your exported jar file, and for your program to use its libraries.
To do so, drag and drop the Snakeyaml.jar file into your src folder in eclipse.
Then, go to build path, and instead of looking for external jars for your buildpath, choose to use the jar file that is already in your src folder in eclipse. Once you do that, you should export it and pick to "Extract required libraries into jar file" or something like that, and everything should work well! You will notice upon opening the exported jar file with a tool like Winrar, that the jar you had in your src folder is not there, but the packages of the jar are actually side by side with yours.

How to create a jar file of a java project which internall uses some external jars

I want to create a jar file of my project which is internally using some other external jars.
Basically what I am expecting is a single jar file which has all the class files and external files in it.
can someone help me in this
If your classes use external jar files then you need to enclose those jars into your jar file.
Right click on the project in eclipse then :
Click on 'export'->'Runnable Jar`
Here: Make sure you select 'Extract required libraries into generated JAR'
This will extract all the libraries present on the classpath of your project. into the exported jar file

How to add jasypt plugin to eclipse

So I am using
Eclipse IDE for Java EE Developers
http://www.eclipse.org/downloads/packages/eclipse-ide-java-ee-developers/keplerrc3
and I am trying to add the jasypt - 1.9.0 plugin to eclipse
Since I am not experienced in this, I only tried one way which is
1- Download the zip file form the following url
http://sourceforge.net/projects/jasypt/files/
2- Unzip the file into the eclipse subdirectory plugins
3- Restart eclipse
However it seems that there is something missing
Go to your downloaded file and go to the lib folder. In there, you have a whole host of jar files. It is most likely the jasypt-1.9.0 jar you want.
In Eclipse: go to: Properties > Java Build Path > Libraries
Choose to add an External Jar and navigate to the location of the jasypt-1.9.0.jar
This will add the jar and its libraries to your project. Note: Look at the API for what you are using if this doesn't work - you may require a different jar to be imported instead/as well.
This is the standard way to add any third-party libraries to your project.

Netbeans can't find external jar

I'm fairly new to Java and need to add an external Jar to the project in netbeans. I've created a library with that Jar using Tools --> Libraries, and added the library in the project Properties --> Libraries under compile, but it still returns "Package does not exist".
Any help?
What version of Netbeans are you using? Make sure your libraries are located outside of the project directory. Just making sure when you add the jar, you don't just add the folder containing them but the actual jar -right?
Try building the project to see if that helps.
Perhaps the library was created incorrectly. If the package structure in the JAR isn't correct, the class loader won't be able to find the .class file.
Open the JAR with WinZip and confirm the contents.

i could not find org.codehaus.staxmate.dom package

I use netbeans 6.9 I want to use org.codehaus.staxmate.dom package but in does not exist. How can I add this package?
Download the jar files from http://staxmate.codehaus.org/
Open up Netbeans and add the jars that you fetched from 1
to add the jars, open up Tools -> Libraries and create a new class library. Finally, add this library to the project's "compile" tab under its libraries section
alternately you can simply right click the project -> properties and then add the jars under the "compile" tab under libraries
Generally, make it point to look for the jar file names here : http://www.jarfinder.com/
That will help you decide the jar file needed and where to download it from as well :)
Download staxmate from:
The Staxmate Web Site.
This package is not included in standard Java Runtime Environment. So,
you either have to download corresponding jar manually, and specify as library in your project configuration
or have to use some build manager in your project (for example, Maven) and specify dependency on corresponding package

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