I followed all steps in this tutorial to create an JWS app but after downloading the .jnlp file, I couldn't run the .jnlp file.
Here is the error announcement(open this image in a new tab to see it more clearly) By the way, from where should I jar all classes? In this example, I wrote the command line: jar -cf TestJnlp.jar*.* from within E:\\Java\\CuongNguyen\\project04.
You forgot to sign your jar file with jarsigner. That is, you didn't do step 6 in the tutorial.
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