The New wizard displays the Specify JAR Recipe Contents pane when you create a JAR recipe file. You can use the Specify JAR Recipe Contents pane to specify which files you want to include in your JAR file.
The left panel displays a tree view of all filesystems that are mounted and visible in the Explorer. You can navigate this tree and select the directories and files that you want to add to your JAR file. You can select multiple files by holding down Control or Shift while clicking file names and directories. Click the Add button to add the selected files and directories to the JAR contents.
When you add a directory to a JAR, you also add all of its contents. The Modify JAR Recipe Contents pane of the New wizard displays one item for the entire directory and does not display individual items for the directory's contents. The directory contents are included in the created JAR file when you compile the JAR recipe.