If JCAT doesn't open after you export it and you know your JRE is 1.6 or above, you must do the following. Ensure you have all SWT libraries in the build path when you export JCAT. Next, edit the file "MANIFEST.MF" in "/META-INF/". Next, put the SWT library of your JRE's name first in the list of SWT libraries in "Rsrc-Class-Path: ". Save, and it should execute as desired. (See "Executables" on GitHub for JCAT .jars that contain correct "MANIFEST.MF" files).
If JCAT doesn't open after you export it and you know your JRE is 1.6 or above, you must do the following. Ensure you have all SWT libraries in the build path when you export JCAT. Next, edit the file "MANIFEST.MF" in "/META-INF/". Next, put the SWT library of your JRE's name first in the list of SWT libraries in "Rsrc-Class-Path: ". Save, and it should execute as desired. (See "Executables" on GitHub for JCAT .jars that contain correct "MANIFEST.MF" files).