I have a gwt project that wrap in chrome extensions.
In GWT, I export a java method to jsni called:
Java Method: sendMessage(String msg);
export jsni: $wnd.sendMessage = function(msg) { ... };
then in chrome extension, I execute:
chrome.tabs.executeScript(tabId, {code: "sendMessage('hello');"}
but not thing happened, I've tried:
chrome.tabs.executeScript(tabId, {code: "alert('hello');"}
and it just works fine. but it just can't call my gwt jsni method.
Chrome content scripts exist in an isolated world.
$wnd.sendMessage is exported in the page context, and not accessible from a content script.
You'll need to inject code into the page itself (with a <script> tag) to access it.
See this canonical question on the topic, and this question can also be of use: Executing code at page-level from Background.js and returning the value
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