Part 1 # Perfmon
Launch Performance Monitor (perfmon.msc)
Create a new User Defined Data Collector Set
Choose to create manually after naming
Select Performance Counter Alert
Click Add - choose the Object,Counter and Instance to monitor. Process/Java.exe/Working Set
Specify the alert threshold
Choose "open properties for this data collector set"
Specify a start schedule if the server is on a reboot schedule
Change the sample interval. Alert repeats at this interval when value it above threshold
Under Alert task,give it a name (like sendMail)
Start the Data Collector Set

Part 2 # Schedule Tasks
Open up scheduled tasks (compmgmt.msc/configuration/task scheduler)
Create a task,not a basic task
Name it the exact same name you did in the above section (like sendMail)
Check "user is logged in or not" so that it runs all the time. Change username if necessary.
Create a new email action under the Action tab
Enter all the info for from,to,subject,etc.
Enter the SMTP server.
You will be prompt for the password to run the task when you are not logged on.