In NetBeans a bug has been filed describing jarsigner failures when building FX Application projects with parameters (named or unnamed):

http://netbeans.org/bugzilla/show_bug.cgi?id=222091

NB QA discovered the issue manifests itself only if the length of at least one of the supplied parameters exceeds 56 chars. We discovered that the problem then is in the corrupted jar manifest produced by <fx:jar>.
Example of a AFAICT correct manifest with one named and one unnamed parameter, length of both 56 chars:

Manifest-Version: 1.0
JavaFX-Parameter-Name-1: bmFtZWQ=
implementation-vendor: psomol
JavaFX-Version: 2.2
implementation-title: JavaFXApplication6
implementation-version: 1.0
JavaFX-Argument-1: YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWF
 hYWFhYWFhYWFhYWFhYWFhYWE=
JavaFX-Application-Class: javafxapplication6.JavaFXApplication6
JavaFX-Class-Path: lib/JavaLibrary1.jar
JavaFX-Parameter-Value-1: YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFh
 YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWE=
Created-By: JavaFX Packager
Main-Class: com/javafx/main/Main

Now the corrupted one, obtained by prolonging the parameters by 5 more chars in the same project:

Manifest-Version: 1.0
JavaFX-Parameter-Name-1: bmFtZWQ=
JavaFX-Version: 2.2
implementation-vendor: psomol
implementation-title: JavaFXApplication6
implementation-version: 1.0
JavaFX-Argument-1: YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWF
 hYWFhYWFhYWFhYWFhYWFhYWFi
Y2RlZg==
JavaFX-Application-Class: javafxapplication6.JavaFXApplication6
JavaFX-Class-Path: lib/JavaLibrary1.jar
JavaFX-Parameter-Value-1: YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFh
 YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFi
Y2RlZg==
Created-By: JavaFX Packager
Main-Class: com/javafx/main/Main

Note that the param strings got broken and trailing parts of them ("Y2RlZg==") are now misplaced as identifiers. The consequence is the jarsigner failure as reported in NB bugreport.