Sensor tab is missing in Jdeveloper 11g

You are trying to create a BAM sensor in Jdeveloper 11g and you are not getting the sensor tab in your bpel process.

If you can see in the pic below i have created a simple bpel process and the sensor button in not available in structure window.



In 11g this feature has been moved to monitor perspective.

you can see a monitor tab on top of the bpel process.by default when a process is created it appears in BPEL mode.click on Monitor mode to switch to other perspective and now you should be able to see the sensor variables.