You have to create a bash script, something like this
#!/bin/sh
JAVA_HOME=/usr/java/jdk1.6.0_12
GROOVY_HOME=/home/jboss/groovy-1.7.5
export JAVA_HOME
export GROOVY_HOME
PATH=$PATH:$JAVA_HOME/bin:$GROOVY_HOME/bin:
export PATH
cd /home/jboss/jboss-4.2.1.GA/server/flt/conf/scripts
(Assuming that Groovy script located at /home/jboss/jboss-4.2.1.GA/server/flt/conf/scripts)
groovy -classpath /home/jboss/jboss-4.2.1.GA/server/flt/conf/scripts /home/jboss/jboss-4.2.1.GA/server/flt/conf/scripts/test.groovy
and within the crontab you can call your bash script
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