将Jama库集成到Netbeans平台中

Question

I would like to integrate the Jama library into Netbeans (not just a single project). However, I get the message " package Jama does not exist. " I have done the following:

• I downloaded Jama's jar file.
• Then I went to Tools , Libraries , pressed the button new library .
• Put in the name of the library and hit OK .
• Then I hit the button " Add JAR / Folder " and chose the jar file.

What can this be? Unfortunately I only found descriptions of how to integrate libraries into individual projects.

Answer 1

You use the word "platform", so I'm assuming you are building an application based on the NetBeans Platform .

Whenever you want to use an external library in such an application it is generally (although not always, but it is the cleanest method) required to create a library wrapper module for your external jar. You essentially wrap that external jar in a NetBeans module. Then you include the newly created module in application.

Creating a library wrapper module is simple, but the method depends if you are using Ant or Maven:

• Ant : New project --> NetBeans Modules --> Library Wrapper Module

• Maven : Create an empty NetBeans module. Add your Jama library as a dependency, something like:

<dependency>
    <groupId>gov.nist.math</groupId>
    <artifactId>jama</artifactId>
    <version>1.0.3</version>
</dependency>

You also need to tell which packages your newly created module exposes to the rest of the world, but in your case it is likely to be everything, ie all packages in the jar.

Once you have wrapped your jar in a module then that functionality can be used from any other NetBeans Module as long as you create a dependency on your newly created module.

Note: If only one module in your application will actually directly interact with Jama (ie use its classes), then you do not need a library wrapper module. Then you just do as follows on the module that will use the Jama classes: Right-click the top node of the project:

Then choose "Properties" --> "Libraries" --> "Wrapped JARs" tab. And add your Jama jar there.