The plugin defines a code generator that will insert the code public static final long serialVersionUID=0L To invoke the Generator 1. Open a Java (.java) Source file 2. Press Alt-Insert (Ctrl-i on Mac OS X). 3. Selected Generate serialVersionUID 4. Once you trigger the action the plugin will generate the code Please report any issues at https://github.com/manikantannaren/mynetbeans/issues with the prefix [NB-Generate-SUID]