<?xml version="1.0"?>
<!DOCTYPE COMMANDO SYSTEM "commando.dtd">
<!-- Quick Groovy Commando Command -->
<COMMANDO>
	<UI>
		<CAPTION LABEL="Source File(s)">
			<FILE_ENTRY LABEL="File Name" VARNAME="file"
					EVAL="buffer.getPath()"/>
		</CAPTION>
		<CAPTION LABEL="Interpreter Options">
			<CHOICE LABEL="Action" VARNAME="action" DEFAULT="run">
				<OPTION LABEL="Run" VALUE="run"/>
			</CHOICE>
			<CHOICE LABEL="Safety" VARNAME="safety" DEFAULT="0">
				<OPTION LABEL="Unsafe" VALUE="0"/>
				<OPTION LABEL="Low" VALUE="1"/>
				<OPTION LABEL="Medium" VALUE="2"/>
				<OPTION LABEL="High" VALUE="3"/>
				<OPTION LABEL="Sandbox" VALUE="4"/>
			</CHOICE>
			<CHOICE LABEL="Warnings" VARNAME="warning" DEFAULT="2">
				<OPTION LABEL="No Warnings" VALUE="0"/>
				<OPTION LABEL="Simple Warnings" VALUE="1"/>
				<OPTION LABEL="Full Warnings" VALUE="2"/>
			</CHOICE>
			<ENTRY LABEL="Source File Encoding" VARNAME="encoding"
					EVAL="buffer.getProperty(Buffer.ENCODING)"/>
			<TOGGLE LABEL="Switches are global variables"
					VARNAME="transform" DEFAULT="FALSE"/>
			<TOGGLE LABEL="Verbose output" VARNAME="verbose" DEFAULT="FALSE"/>
			<TOGGLE LABEL="Embedded Groovy script" VARNAME="embedded"
					DEFAULT="FALSE"/>
			<ENTRY LABEL="Other Options" VARNAME="other"/>
		</CAPTION>
		<CAPTION LABEL="Script Options">
			<ENTRY LABEL="Script Command-Line Arguments" VARNAME="arguments"/>
		</CAPTION>
	</UI>
	<COMMANDS>
		<COMMAND SHELL="System" CONFIRM="FALSE">
           buf = new StringBuffer();
           buf.append("/opt/groovy-1.0/bin/groovy");
           buf.append(" \""+file+"\"");
           if(!arguments.equals(""))
               buf.append(" "+arguments);
           // return value
           buf.toString();
       </COMMAND>
	</COMMANDS>
</COMMANDO>

This allow running groovy inside jEdit
Copy it to $HOME/.jedit/console/commando

jEdit's Plugin: Commamdo config for groovy

XML