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When your Java project requires a JAR (Java Archive) library to run, you need to customize your project to add the libraries to the build path. Fortunately, Eclipse makes this process simple and easy to remember. The build version used in this article is Eclipse Java – Ganymede 3.4.0.
Steps
Add inner JAR (Internal)
Copy the JAR you will use for your project. Usually the steps are as follows:
- Create a new folder called lib in your project folder. This stands for “libraries” that includes the entire JAR you will use for that project.
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Do one of the methods below to finish customizing your build path.
Method 1
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Open the lib in Eclipse and select all the JARs you need.
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Right click on the JAR and point to Build Path .
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Select Add to Build Path . The JAR will disappear from the lib and reappear in the Referenced Libraries .
Method 2
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Right click on the project name and point to Build Path .
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Select Configure Build Path… and the Project Properties window will appear for you to customize the build path.
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Select the Libraries tab.
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Click Add JARs… (Add JARs)
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Search and select the desired JAR then click OK . The JAR will now appear in the list of libraries in the build path.
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Click OK to close the Properties window. The JAR will now be in Referenced Libraries instead of in lib .
Add External JAR (External)
Note: It is better to reference the JAR that is present in your project or another project – This helps you to check all the dependencies in the version control system (version contrp). (You ‘re using a version management system, right?). Use one of the methods below.
Method 1
This is the preferred method because it allows multiple developers of the same project to search for external jars in different locations.
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Right click on the project name and point to Build Path .
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Select Configure Build Path… and the project Properties window will be displayed, allowing you to customize your build path.
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Click Add Variable… (Add Variable)
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Click Configure Variables… (Customize Variables)
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Click New… (New Variable)
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Type a name for the new variable. For example: If it is a JAR of Tomcat, it can be named TOMCAT_JARS
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Navigate to the directory containing the JAR to use as the path. (You can also select a specific jar file for the variable if you want.)
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Click Ok to define the variable.
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Click Ok to close the options dialog box.
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Select variable from the list.
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Click Extend… (Expand)
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Select one or more JARs that you want to add to the classpath variable.
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Click Ok to close the extension dialog box.
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Click Ok to close the new classpath variable dialog box.
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Click Ok to close the build path settings dialog box.
- If you share the project with others, they must also define the variable. They can define it in
Window->Preferences->Java->Build Path->Classpath Variables
Method 2
Note that if you use this method, the external JAR must be in the same location on everyone’s hard drive. This can make it more difficult to share a common project.
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Right click on the project name and point to Build Path .
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Select Add External Archives… (Add External Archives)
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Search and select the JAR you want and then click Open . The JAR will now appear in Referenced Libraries .
Method 3
Note that if you use this method, the external JAR must be in the same location on whoever’s hard drive is working on the project. This can make sharing a joint project more difficult.
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Right click on the project name and point to Build Path .
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Click Configure Build Path… and the project Properties window will be displayed to customize your build path.
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Select the Libraries tab.
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Click Add External JARs… (Add External JARs)
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Search and select the desired JAR and click Open . The JAR should now appear in the library list of the build path.
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Click OK to close the Properties window. The JAR will now be in Referenced Libraries .
Advice
- Every time you add a new file or folder to your project in Eclipse through anything other than Eclipse, you must refresh the affected projects so Eclipse knows where the new files are. Otherwise you may get a compile error or a build path error.
- Even though the internal JARs disappear from lib , they still exist in the filesystem. This is just Eclipse’s way of notifying you that those JARs have been added.
- To be on the safe side, you’ll probably need to create a folder to write your code notes in the text. Here’s how to do it:
- Right-click the .JAR in the Reference Libraries in the package explorer.
- Select the Javadoc tag and type the directory (or URL) containing the text. (Note: Eclipse doesn’t like this and the validation will fail. Don’t worry though, it will work.)
- Select Java Source Attachment and search for the folder or .JAR file containing the source.
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When your Java project requires a JAR (Java Archive) library to run, you need to customize your project to add the libraries to the build path. Fortunately, Eclipse makes this process simple and easy to remember. The build version used in this article is Eclipse Java – Ganymede 3.4.0.
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