GWT SuperDevMode RPC host

Question

I'm trying to start SuperDevMode the following way. I modified my index.jsp page to append a configurable prefix to the .nocache.js file. Production config contains an empty prefix, while development config contains something like http://localhost:9876. Then I start the server on Tomcat and type localhost:8080. GWT starts normally, but when it tries to send an RPC request, it fails, because request goes to localhost:9876 instead of localhost:8080. How can I customize which host should RPC use to send request to?

Answer 1

I spent some time digging into GWT code with Eclipse and debugger, and found, that GWT RPC concatenates the result of GWT.getModuleBaseURL() with the value of @RemoteServiceRelativePath. Here is the code of the getModuleBaseURL method:

public static native String getModuleBaseURL() /*-{
  // Check to see if DevModeRedirectHook has set an alternate value.
  // The key should match DevModeRedirectHook.js.
  var key = "__gwtDevModeHook:" + $moduleName + ":moduleBase";
  var global = $wnd || self;
  return global[key] || $moduleBase;
}-*/;

I also examined dev_mode_on.js and found several occurences of __gwtDevModeHook, but none of them contained moduleBase. Also dev_mode_on.js install all its hooks into sessionStorage, while getModuleBaseURL reads from $wnd (I used debugger and became convinced that $wnd = window).

So I used the following solution and it worked for me. I simply added the following into my index.jsp:

<c:if test="${not empty gwtScriptPrefix}">
  <script type="text/javascript">
    window["__gwtDevModeHook:MYAPP:moduleBase"] = "MYAPP/";
  </script>
</c:if>

just before

<script type="text/javascript"
        src="${gwtScriptPrefix}MYAPP/MYAPP.nocache.js">
</script>

where the gwtScriptPrefix attribute is calculated by System.getProperty, and the corresponding system property is set to localhost:9876/ on the Eclipse running configuration.