Sendgrid CFML sample using sendgrid-java.jar and tested on Lucee 4.5

sendgrid-java-lucee.cfm

<cfscript>
try {
	SendGrid = CreateObject("java", "com.sendgrid.SendGrid", expandPath("sendgrid-java.jar")).init('<API KEY>');
	Email = CreateObject("java", "com.sendgrid.SendGrid$Email", expandPath("sendgrid-java.jar"));

	Email.addTo("<TO ADDRESS>");
	Email.setFrom("<FROM ADDRESS>");
	Email.setSubject("Hello World, #getTickCount()#");
	Email.setHtml("<p>My <strong>first</strong> email with SendGrid Java!</p>");

	javaFile = createObject( 'java', 'java.io.File' ).init( '<FILE LOCATION>' );
	Email.addAttachment('<FILE NAME>', javaFile);

	javaResponse = SendGrid.send(Email);
	
	objResponse = {};
	objResponse.Message = javaResponse.getMessage() ?: "";
	objResponse.Status = javaResponse.getStatus() ?: "";
	objResponse.Code = javaResponse.getCode() ?: "";

	writeDump(objResponse);

}
catch (Any excpt) {
	writeDump(excpt);
}
</cfscript>