First, this is not recommended, as you would spawn an external process, which could bring down the server if it doesn't return. So if you want to go there, you'd better have very robust code. Also, security must be considered.
Then, you are not running in a full-fledged JS environment you know from your browser, you have only limited support for JS objects - RVS uses the Rhino engine.
So one place to look for techniques would be the rhino documentation.
The easiest approach would be to write a starter class in java, and in your trigger just call that starter class. The java launcher method would look like this (sample which provides the script inline and saves a .docx as .pdf):
String[] cmds = new String[5];
cmds[0] = "powershell.exe";
cmds[1] = "-executionpolicy";
cmds[2] = "ByPass";
cmds[3] = "-Command";
cmds[4] = "$filename = '" + filePath + fileName + "';"
+ "$word_app = New-Object -ComObject Word.Application; $document = $word_app.Documents.Open($filename);"
+ "if ($document.TablesOfContents -ne $null) {$document.TablesOfContents.item(1).Update();};";
if (genPDF) {
cmds[4] = cmds[4]
+ "$pdf_filename = '" + filePath + fileName.replace(".docx", ".pdf") + "';"
+ "$document.SaveAs([ref] $pdf_filename, [ref] 17);";
}
cmds[4] = cmds[4] + "$document.Close();";
cmds[4] = cmds[4] + "$word_app.quit();";
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(cmds);
proc.getOutputStream().close();
proc.waitFor();
Put this into a class, compile, drop the class into the java\classes subdirectory as usual, restart the server to load it. Then your trigger can call the method of that class.
