I'm trying to get some of the code samples from a Jar file for the book Head First Java but I can't open them because it says it is missing a manifest.
I am using this command: java -jar codeKitchensTiger.jar
That's the correct command to run the jar file as an application, but it sounds like it's not an application, but merely an archive of files. The command to unpack such an archive would be
jar xf codeKitchensTiger.jar
The "jar" application is in the JDK, along with "java" and "javac".