Java Netbeans project.properties, manifest file, code signing certificates and jnlp files.

In the project folder, project/nbproject/project.properties we can modify various attributes that affect the project properties, such as;

See the # Optional override of default tags.

manifest.custom.permissions=all-permissions

Specifically if using a jnlp file, then the permissions and codebase options should match otherwise Java security might not allow application to launch.

In Netbeans, under webstart, choose user defined and enter full codebase, also note this post re having different jar files with different certificates.

For more details, see here:
https://blog.david14.com/2020/07/application-blocked-by-java-security.html

See here for a walkthrough; https://docs.oracle.com/javase/tutorial/deployment/webstart/deploying.html

Also see here: https://www.oracle.com/technical-resources/articles/javase/ds-jnlp-javawebstart.html