I am running my app on google app engine. All I have is a simple servlet that is trying to use Jsoup. However when I run the application I get java.lang.ClassNotFoundException: org.jsoup.Jsoup.
I am using Eclipse so I added the jsoup jar file in the Java Build Path -> Libraries
You need to put the Jsoup JAR file in the /WEB-INF/lib folder of the webapp. That folder is covered by webapp's default classpath. Also, Eclipse will automagically put all libraries in /WEB-INF/lib folder in the buildpath of the project, you shouldn't need to do that manually. Of course I assume that the project is been created as Dynamic Web Project.
Another way to add the .jar is to right click on your project, and choose Properties -> Java Build Path, click the Libraries tab, then click Add External JARs... This will allow you to browse to the path of the .jar file you wish to add.
Also make sure your import org.jsoup.Jsoup; imports are after all the application imports such as
import com.google.gwt.core.client.GWT;
Having the JSOUP imports before those other imports caused errors for deploying an application at one point for me.
I had the same error now on my Android project. To Fix this on Android, you need to create a lib folder and put the .jar file there
Related
How do I import a jar in Eclipse?
You can add a jar in Eclipse by right-clicking on the Project → Build Path → Configure Build Path. Under Libraries tab, click Add Jars or Add External JARs and give the Jar. A quick demo here.
The above solution is obviously a "Quick" one. However, if you are working on a project where you need to commit files to the source control repository, I would recommend adding Jar files to a dedicated library folder within your source control repository and referencing few or all of them as mentioned above.
Adding external Jar is not smart in case you want to change the project location in filesystem.
The best way is to add the jar to build path so your project will compile if exported:
Create a folder called lib in your project folder.
copy to this folder all the jar files you need.
Refresh your project in eclipse.
Select all the jar files, then right click on one of them and select Build Path -> Add to Build Path
Two choices:
1/ From the project:
2/ If you have already other jar imported, from the directory "References Libraries":
Both will lead you to this screen where you can mange your libraries:
Here are the steps:
click File > Import. The Import window opens.
Under Select an import source, click J2EE > App Client JAR file.
Click Next.
In the Application Client file field, enter the location and name of the application client JAR file that you want to import. You can click the Browse button to select the JAR file from the file system.
In the Application Client project field, type a new project name or select an application client project from the drop-down list. If you type a new name in this field, the application client project will be created based on the version of the application client JAR file, and it will use the default location.
In the Target runtime drop-down list, select the application server that you want to target for your development. This selection affects the run time settings by modifying the class path entries for the project.
If you want to add the new module to an enterprise application project, select the Add project to an EAR check box and then select an existing enterprise application project from the list or create a new one by clicking New.
Note: If you type a new enterprise application project name, the enterprise application project will be created in the default location with the lowest compatible J2EE version based on the version of the project being created. If you want to specify a different version or a different location for the enterprise application, you must use the New Enterprise Application Project wizard.
Click Finish to import the application client JAR file.
Just a comment on importing jars into Eclipse (plug-in development) projects:
In case you are developing Eclipse plug-ins, it makes sense to use Eclipse's native bundling mechanism instead of just importing the jar into a plug-in project. Eclipse (or better its underlying OSGi runtime, Equinox) uses so-called bundles which contain some more information than plain jars (e.g., version infos, dependencies to other bundles, exported packages; see the MANIFEST.MF file). Because of this information, OSGi bundles can be dynamically loaded/unloaded and there is automatic dependency resolution available in an OSGi/Eclipse runtime. Hence, using OSGi bundles instead of plain jars (contained inside another OSGi bundle) has some advantages.
(BTW: Eclipse plug-ins are the same thing as OSGi bundles.)
There is a good chance that somebody already bundled a certain (3rd party) library as an OSGi bundle. You might want to take a look at the following bundle repositories:
http://www.springsource.com/repository/app/
http://download.eclipse.org/tools/orbit/downloads/
http://www.osgi.org/Repository/HomePage
Eclipse -> Preferences -> Java -> Build Path -> User Libraries -> New(Name it) -> Add external Jars
(I recommend dragging your new libraries into the eclipse folder before any of these steps to keep everything together, that way if you reinstall Eclipse or your OS you won't have to rwlink anything except the JDK) Now select the jar files you want. Click OK.
Right click on your project and choose Build Path -> Add Library
FYI just code and then right click and Source->Organize Imports
Jar File in the system path is:
C:\oraclexe\app\oracle\product\10.2.0\server\jdbc\lib\ojdbc14.jar
ojdbc14.jar(it's jar file)
To import jar file in your Eclipse IDE, follow the steps given below.
Right-click on your project
Select Build Path
Click on Configure Build Path
Click on Libraries, select Modulepath and select Add External JARs
Select the jar file from the required folder
Click and Apply and Ok
first of all you will go to your project what you are created
and next right click in your mouse and select properties in the bottom
and select build in path in the left corner and add external jar file add click apply .that's it
In eclipse I included a compressed jar file i.e. zip file. Eclipse allowed me to add this zip file as an external jar but when I tried to access the classes in the jar they weren't showing up.
After a lot of trial and error I found that using a zip format doesn't work. When I added a jar file then it worked for me.
Right Click on the Project.
Click on Build Path.
Click On Configure Build Path.
Under Libraries, Click on Add Jar or Add External Jar.
If you are having a trouble on udemy course of chad on springboot for the importing the jar. Then follow these steps.
Right click on the project.
You will see a option of Build Path, click on it.
You will have a option of Configure Build path, click on it.
Go to libraries.
Then go to the place where you have a jar files make them into a new folder and upload on a new place.
Then click on Add External Jars, you will surely be able to upload it which will help on classpathxmlapplicationcontext as well.
Thank you.
I'm building a Java Swing Application. This project requires a jar file called JCalender. I've added this to Libraries folder and everything works fine on my computer in NetBeans. But when i open the same project in my friends NetBeans, it doesn't recognizes this library. I've to manually select the file placed inside the projects dist/lib folder. How to avoid this? please help!
But when i open the same project in my friends NetBeans, it doesn't
recognizes this library. I've to manually select the file placed
inside the projects dist/lib folder. How to avoid this?
You can't avoid this because it's not a problem actually. To compile and run a project you need to have access to the external libraries involved in the development, so if you open your NetBeans project in a different computer than yours you will definitely need to resolve the reference to the external libraries. There's no way for the IDE to do it automatically as far as I know.
Can't i give the relative path to the lib folder for that specific
library somewhere in project properties?
You could just give it a try. IMHO if the real goal is to share a project with other developers then I'd change the strategy. I'd create a Library (Tools -> Libraries) and tell my mates to create the very same library including the JCalendar JAR files in the library's classpath. I'd include this library in the project properties and finally I'd use a versioning tool like Git or SVN to share the project.
By doing this your mates still need a copy of the JAR file wrapped in a NetBeans Library, but the project properties won't point to a fixed/relative path looking for a JAR file but wil include a reference to a given Library. The Library itself will resolve the dependency to the JAR file. If you take a look to the project.properties file you'll see something like this:
javac.classpath=\
${file.reference.jcalendar-1.4.jar}
But if you as I've suggested then you'll see something like this:
javac.classpath=\
${libs.JCalendar.classpath}
Here libs.JCalendar.classpath will resolve the dependency so your mates can have the actual JAR file located in whatever folder they like and the project should compile just fine.
Another option is using Maven to manage the projects dependencies but honestly I'm not a Maven expert so I can't help you in this path.
You need to do a "clean and build" and your jar will be in the dist folder. It will include the external jars
You can read more about it here
I think your problem is due to you are providing absolute path of jar file.
while choosing jar on write side of filechooser there is option of
Relative path and Absolute path there you should click on Absolute path.
i am new to java , but anyway , i have faced the same problem and found a solution for my project
If you are in Netbeans , its would be very easy for you
Let you project name is ABC and all your dependent jar file is under the
the folder MyResourceCollection
now we need to permanently import all jars under this folder ,
So from Netbeans ,
right click on your project name
go to properties
go to library
in the library page , check the "libraries folder" label
you can find a browse button at the right side of the label
click browse and select the MyResourceCollection folder
a new window will come , just press Next-->Next--->Finish
all is done , now check yourself by moving the folder into different location
i have a project in tomcat,and use startup to set up it.
i want to import it into eclipse in order to debug it,and then i try to import project like this:
it displays no project found, maybe it does not have .project file
how could i import it correctly and conviently? there are only class in web-inf,so how could copy it?
Do the following:
Create new Dymanic Web Project in Eclipse
Right click -> Import -> General -> File system, on this project.
Choose source directory.
And check Java Build Path in your project to be sure your Libraries correctly loaded.
There is no direct way to do this, however...
Perhaps, the simplest way to do this is the following:
Download Eclipse Java EE
Create a Dynamic Web project
Copy the contents of your webapp (or war) to the WebContent folder
If the project contains Java sources andyou have access to them add them (including the package structure) to the src folder.
Probably really simple but I just cannot work out how to use any API's with Java (Using Eclipse).
Where do they go?
For example I want to use a Twitter API and I import it using:
import net.unto.twitter.Api;
I then include the API file in the same dictionary as my class file. (This is what I do in python)
Anyone care to tell me the simple answer?
Typically APIs are packaged in so-called JARs, which stands for Java ARchive. What you should do is:
Download the jar.
Put it in some sort of 'lib' directory in your project structure. Do not put it with your source code.
Add the jar to your classpath. Some IDEs you have to add jar by jar, others you tell the IDE which directories are library directories and it will modify the classpath for you to include all the jars in the directory.
Import the relevant package in your files where you use the API.
Once you have the jar added to your classpath and import the relevant classes, Eclipse should automatically pick it up and allow you to use autocomplete features against the API.
It is also a good idea to get the source jar for any libraries you download. Most IDEs let you attach src jars, so you can click into the API and see how the code is written.
You need to include any external JARs in the build path. In eclipse right click on the project and go to 'Build Path' > 'Configure Build Path' then go to the 'Libraries' tab and 'Add JARs'. Also, when using eclipse it is easier not to maintain the import statements yourself, but instead use 'Organize Imports' (ctrl + shft + o) or Import the selected object (ctrl + shft + m). If a matching object is available in the classpath it will be imported.
Java APIs are distributed in JAR files (which are just zip files with a specifiec directory structure).
Download the jar in question, put it in a known location on your disk (known location as in, pay attention to the name of the direcctory where you store the downloaded jar).
There are two times you will need to reference a Jar file:
During project compilation. This includes development of the project using an IDE like eclipse (they all compile the code to find errors).
Option 1, add an external jar:
Open the project properties in Eclipse
Select Java Build Path
Select the Libraries tab
Click the Add External Jar button
Browse to the location of the JAR in question.
Select the JAR.
Click the Open button.
Option 2, add the JAR to your web project's WEB-INF/lib directory.
During project execution. This will be after you deploy your application to a web container (perhaps tomcat). Store the JAR in question in the classpath of the appliction post deploy. For simple web applications, you can put the jar in the project WEB-INF/lib directory.
You should have it included in the classpath (build path) of the project.
I am now going to use the .jar file on http://code.google.com/p/google-api-translate-java/. However, after I download it, I tried to import it in my current project folder (in Eclipse)
the two import statements
import com.google.api.translate.Language;
import com.google.api.translate.Translate;
always get complained by the compiler saying couln't find such class
Could any one help on how to correctly import this .jar file into a project in Eclipse?
You need to add it to your build path. Right-click on the project in Project View, select Build Path->Configure Build Path, then Libraries tab. Now, use one of available options there to add a JAR.
Use "Add JAR" if you copied the jar to your project folder or "Add External JARs" to add it by poiting to a path in filesystem. (Anyway, it is better to copy the jar to the project folder, in which you want to use the jar).
HTH
see How to import class into existing Java project, with Eclipse
Copy the google-api-translate-java-0.92.jar file to your project /WEB-INF/lib/ folder and refresh your project (right click on project and select "refresh").
Google Translate API v1 is deprectaed and will shutdown soon.
You can use Google Translate API v2 Java. It has a core module that you can call from your Java code and also a command line interface module.
Hy I have faced the same issue and fixed it
Step1: download google-translate-api jar file
step2: paste into your app library file
step3: Goto project structure > app > select dependencies -> then add path of your jar file...
Enjoy now you can acess google api services