不能在NetBeans中导入jar文件类

Question

I created a jar file from a bunch of java files. Folder structure was org/ax/redis . I used the command jar cvf jedis.jar org/* . Then I imported this jar file in my netbeans project. Then when I tried importing classes from it, by writing import org.ax.redis.* . However, netbeans shows error that no such package exists.

Now I opened another jar file of log4j to see how it is from inside. Only difference was in manifest file. It had a bunch of directives like Name: org/apache/log4j/ . So I created a manifest file for my jar file by including Name: org/ax/redis/ . Used this command to add manifest information in my jar jar cvfm jedis.jar META-INF/manifest.txt org/* . Still nothing works. Please help me

Answer 1

Even If u don't generate .class file , the package still can be imported and it won't show any compilation error(If U don't specify any particular class) . However when U try to use a particular class function of that package , it will throw an error .

Answer 2

Jar files typically contain class files (the results of compilation) rather than source files (*.java). While some jar files may contain both, only the class files are available to compile or run against (eg using -cp library.jar ).

So basically, before you build your jar file, you need to compile your code - and then include the class files in the jar file. If you include the source files as well (in the same directory structure) then some IDEs may be able to detect that, which can be useful.