Java - Expected “"” but found unknown token

I am receiving this error when trying to execute applescript from my java application. The code is as follows:

String script = "tell application \"Terminal\" to do shell script \"/System/Library/CoreServices/Menu\\ Extras/user.menu/Contents/Resources/CGSession -suspend\" ";
ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngin开发者_如何学JAVAe engine = mgr.getEngineByName("AppleScript");
engine.eval(script);

I get the following error:

Exception in thread "main" javax.script.ScriptException: Expected “"” but found unknown token.
    at apple.applescript.AppleScriptEngine.evalScript(Native Method)
    at apple.applescript.AppleScriptEngine.eval(AppleScriptEngine.java:342)
    at apple.applescript.AppleScriptEngine.eval(AppleScriptEngine.java:313)
    at myTestApp.Main.main(Main.java:25)

Thanks for your consideration.

A guess based on experience... Maybe the escaped space in the pathname is your show stopper.

Try to call a script from a location where the path has no spaces or try to 'double-escape' the escaped space, like so:

"tell application \"Terminal\" to do shell script \"/System/Library/CoreServices/Menu\\\\ Extras/user.menu/Contents/Resources/CGSession -suspend\" "

A common reason for strange errors are those whitespaces in pathnames. So it was my first guess, that this causes trouble in your script. Then I remembered that sometimes we have to 'escape escaped backslashes'. This article doesn't explain, why it solved exactly your problem, but it shows how many backslashes may be needed...

You need to 'double-escape' the space in the path:

        vvvv
...\Menu\\\\ Extras\...