My understanding on the J&J is that it uses viral vector technology and it too tells the body to create the virus.

https://www.hackensackmeridianhealth.org/HealthU/2021/01/11/a-simple-breakdown-of-the-ingredients-in-the-covid-vaccines/

Recombinant, replication-incompetent adenovirus type 26 expressing the SARS-CoV-2 spike protein:a modified and harmless version of a different virus (Adenovirus 26) is used as a “vector” to deliverthe DNA gene sequence to produce the coronavirus spike protein. Once the modified adenovirus vaccine enters into the cells, the body of the virus essentially disintegrates and the DNA material within it travels into the nucleus of the human cell where it is transcribed into mRNA. The coronavirus spike protein is then produced and displayed on the cell’s surface, prompting the immune system to begin producing antibodies and activating T-cells to fight off what it thinks is an infection.