VisualVM/jHat OQL toString() Error

[Alec Lee]

I just followed the documentation and used the following OQL (taken directly from the example) in VisualVM/JHat but it gives me an exception:

select s
from instanceof java.lang.String s
where /java/(s.value.toString())  

javax.script.ScriptException: sun.org.mozilla.javascript.internal.EcmaError: TypeError: Cannot call method "toString" of null (#1)

Is there any way to get rid of the null objects first in my search before calling its toString()?

[steve souza]

can you put a check for null first.

where /java/(s!=null && s.value.toString())

[Alec Lee]

What is the meaning of the expression after /..../? From my knowledge of client side javascript, an regular expression literal is those things between the pair of /. What are all those things inside the bracket after the regular expression literal? Is it some ecmascript syntax not used with javascript in the browser?