java - Htmlunit ScriptException "console" is not defined - Stack Overflow

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I am using htmlunit 2.9 and on java script parsing I am getting script exception due to console in following exception

function debug(o){
  if (console && console.log){
    console.log(o)
  }
};

Stacktrace

EcmaError:
    lineNumber=[168]
    column=[0]
    lineSource=[null]
    name=[ReferenceError]
    sourceName=[script in http://localhost:808/mypage/ll.html from (154, 36) to (301, 14)]
    message=[ReferenceError: "console" is not defined. (script in http://localhost:8080/mypage/ll.html from (154, 36) to (301, 14)#168)]
.gargoylesoftware.htmlunit.ScriptException: ReferenceError: "console" is not defined. (script in http://localhost:8080/mypage/ll.html from (154, 36) to (301, 14)#168)
         at .gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:595)
         at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:537)
         at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:538)
         at .gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:545)
         at .gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:520)
         at .gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunctionIfPossible(HtmlPage.java:896)
         at .gargoylesoftware.htmlunit.javascript.host.EventListenersContainer.executeEventHandler(EventListenersContainer.java:195)
         at .gargoylesoftware.htmlunit.javascript.host.EventListenersContainer.executeBubblingListeners(EventListenersContainer.java:214)

if I try specified page on firefox it works fine, I have tried v 3.6 as well as 9.0.1.

i have tried also to set setThrowExceptionOnScriptError(false) in order to avoid exception but engine stops or do not parse javascript after getting an error.

Is there any way that javascript engine can understand console in javascript?

I am using htmlunit 2.9 and on java script parsing I am getting script exception due to console in following exception

function debug(o){
  if (console && console.log){
    console.log(o)
  }
};

Stacktrace

EcmaError:
    lineNumber=[168]
    column=[0]
    lineSource=[null]
    name=[ReferenceError]
    sourceName=[script in http://localhost:808/mypage/ll.html from (154, 36) to (301, 14)]
    message=[ReferenceError: "console" is not defined. (script in http://localhost:8080./mypage/ll.html from (154, 36) to (301, 14)#168)]
.gargoylesoftware.htmlunit.ScriptException: ReferenceError: "console" is not defined. (script in http://localhost:8080./mypage/ll.html from (154, 36) to (301, 14)#168)
         at .gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:595)
         at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:537)
         at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:538)
         at .gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:545)
         at .gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:520)
         at .gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunctionIfPossible(HtmlPage.java:896)
         at .gargoylesoftware.htmlunit.javascript.host.EventListenersContainer.executeEventHandler(EventListenersContainer.java:195)
         at .gargoylesoftware.htmlunit.javascript.host.EventListenersContainer.executeBubblingListeners(EventListenersContainer.java:214)

if I try specified page on firefox it works fine, I have tried v 3.6 as well as 9.0.1.

i have tried also to set setThrowExceptionOnScriptError(false) in order to avoid exception but engine stops or do not parse javascript after getting an error.

Is there any way that javascript engine can understand console in javascript?

• java
• javascript
• rhino
• htmlunit

Share Improve this question Follow edited Dec 31, 2011 at 21:39 Mike Samuel 121k3030 gold badges227227 silver badges254254 bronze badges asked Dec 31, 2011 at 21:26 RehmanRehman 3,99866 gold badges3030 silver badges2929 bronze badges 2

• Does it also stop if you use BrowserVersion.FIREFOX_3_6? – milan Commented Dec 31, 2011 at 22:00
• Possibly helpful (see lower answers as well): stackoverflow./questions/1215392/… – Jared Farrish Commented Dec 31, 2011 at 22:37

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3 Answers 3

Sorted by: Reset to default 2

Your if condition isn't properly structured:

if (console && console.log){

That first if will throw an error if its not set; accessing console in environments its not defined in is like accessing any undefined variable; it will throw a ReferenceError.

Try:

if( typeof console != "undefined" && console.log ) {

Or:

if(window.console && console.log) {

It doesn't throw in error in Firefox since Firefox implements the Firebug API, as do Chrome and Safari. But, by default, Internet Explorer does not, so, it's worth doing a proper feature check here, as it will throw a ReferenceError in browsers that don't implement this API.

https://sourceforge/tracker/index.php?func=detail&aid=3518475&group_id=47038&atid=448266 implies that support for console was just added to HtmlUnit.

Your code does use the java script console object, and it's not supported till the current version, and it is promised to be supported in the next release as it is said here

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