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HtmlUnit & GWT Error

I have a GWT application that I am trying to index.

I use HtmlUnit to get the generated HTML content:

WebClient webClient = new WebClient(BrowserVersion.FIREFOX_3_6); HtmlPage refDesing = webClient.getPage("http://localhost:8080/MyGWTApp/#page2"); FileOutputStream fos1 = new FileOutputStream("D:\\work\\out\\page2.html"); fos1.write(refDesing.asXml().getBytes()); fos1.close();

But I get the following error, and the page returns approximately empty!

 Dec 22, 2010 6:16:25 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify WARNING: Expected content type of 'application/javascript' or 'application/ecmascript' for remotely loaded JavaScript element at 'http://xxxxxxxxxxxx/xxxxxxxx/xxxxxxxx/xxxxxxxxxx.nocache.js', but got 'application/x-javascript'. Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [485:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [485:29] Error in style rule. Invalid token "\n". Was expecting one of: "}", ";". Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [485:29] Ignoring the following declarations in this rule. Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [518:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [518:29] Error in style rule. Invalid token "\n ". Was expecting one of: "}", ";". Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [518:29] Ignoring the following declarations in this rule. Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [541:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [541:29] Error in style rule. Invalid token "\n ". Was expecting one of: "}", ";". Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [541:29] Ignoring the following declarations in this rule. Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [951:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [951:29] Error in style rule. Invalid token "\n". Was expecting one of: "}", ";". Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [951:29] Ignoring the following declarations in this rule. Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [977:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [977:29] Error in style rule. Invalid token "\n". Was expecting one of: "}", ";". Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [977:29] Ignoring the following declarations in this rule.

EDIT:

What I mean by roughly empty is a snapshot of the returned HTML:

Please note that HtmlUnit does not return all the data that is displayed on the original page (which original was received from the database). Also what? mean? I do not think this means that any coding error causes all words to be clear ASCII characters.

 <td align="center" style="vertical-align: top;"> <table class="refDesignGrid" cellspacing="5"> <colgroup> <col/> </colgroup> <tbody align="left"> <tr> <td align="left" style="vertical-align: top;"> <table cellpadding="0" class="categoryItem" cellspacing="0"> <tbody align="left"> <tr> <td align="left" style="vertical-align: top;"> <div class="header4"> C++ </div> </td> </tr> </tbody> </table> </td> <td align="left" style="vertical-align: top;"> <table cellpadding="0" class="categoryItem" cellspacing="0"> <tbody align="left"> <tr> <td align="left" style="vertical-align: top;"> <div class="header4"> Java </div> </td> </tr> </tbody> </table> </td> <td align="left"> <table cellpadding="0" class="categoryItem" cellspacing="0"> <tbody align="left"> <tr> <td align="left" style="vertical-align: top;"> <div class="header4"> C# </div> </td> </tr> </tbody> </table> </td> <td> ? </td> </tr> <tr> <td> ? </td> <td> ? </td> <td> ? </td> <td> ? </td> </tr> <tr> <td> ? </td> <td> ? </td> <td> ? </td> <td> ? </td> </tr> <tr> <td> ? </td> <td> ? </td> <td> ? </td> <td> ? </td> </tr> <tr> <td> ? </td> <td> ? </td> <td> ? </td> <td> ? </td> </tr> </tbody> </table> </td> </tr> </tbody> </table> </div>
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2 answers

The answer is here: http://htmlunit.sourceforge.net/faq.html#AJAXDoesNotWork

The main thread using HtmlUnit can complete execution before allowing the background thread to run. You have several options:

webClient.setAjaxController (new NicelyResynchronizingAjaxController ()); will tell your WebClient instance to resynchronize the asynchronous XHR. webClient.waitForBackgroundJavaScript (10000); or webClient.waitForBackgroundJavaScriptStartingBefore (10000); immediately after receiving the page and before its manipulation. Explicitly waiting for a condition that is expected to be met when running JavaScript, for example.

 //try 20 times to wait .5 second each for filling the page. for (int i = 0; i < 20; i++) { if (condition_to_happen_after_js_execution) { break; } synchronized (page) { page.wait(500); } }
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HtmlUnit can be curious and, in particular, may look worse than it is.

Create these two classes:

 import org.w3c.css.sac.CSSException; import org.w3c.css.sac.CSSParseException; import com.gargoylesoftware.htmlunit.DefaultCssErrorHandler; /* * get rid of warnings... and provide a place to hang a break point */ public class QuietCssErrorHandler extends DefaultCssErrorHandler { @Override public void error( CSSParseException e ) throws CSSException { super.error( e ) ; } @Override public void fatalError( CSSParseException e ) throws CSSException { super.fatalError( e ) ; } @Override public void warning( CSSParseException e ) throws CSSException { } }

and

 import com.gargoylesoftware.htmlunit.IncorrectnessListener; public class SilentIncorrectnessListener implements IncorrectnessListener { @Override public void notify( String message, Object origin ) { // do nuttin' honey! } }

then when you create your webclient ...

 wc.setIncorrectnessListener( new SilentIncorrectnessListener() ) ; wc.setCssErrorHandler( new QuietCssErrorHandler() ) ;

And you should get fewer warnings.

As for the "approximately empty" ... what does this mean?

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Source: https://habr.com/ru/post/1333079/

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