Cannot find function mergeHook in object [object]

[basimons]

Hi all,

We have html-unit to do some integration tests for our SAML flow. This all works great, thanks for that. Today I was updating some libraries, including htmlUnit. And I ran into this issue:

14:42:36.442 | ERROR | o.h.j.b.JavaScriptJobManagerImpl | Job run failed with unexpected RuntimeException: TypeError: Cannot find function mergeHook in object [object Object]. (https://ok12static.oktacdn.com/assets/js/sdk/okta-signin-widget/7.9.0/js/okta-sign-in.min.js#73)
org.htmlunit.ScriptException: TypeError: Cannot find function mergeHook in object [object Object]. (https://ok12static.oktacdn.com/assets/js/sdk/okta-signin-widget/7.9.0/js/okta-sign-in.min.js#73)
    at org.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:996)
    at org.htmlunit.corejs.javascript.Context.call(Context.java:590)
    at org.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:484)
    at org.htmlunit.javascript.HtmlUnitContextFactory.callSecured(HtmlUnitContextFactory.java:348)
    at org.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:923)
    at org.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:895)
    at org.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2620)
    at org.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2613)
    at org.htmlunit.javascript.background.JavaScriptFunctionJob.runJavaScript(JavaScriptFunctionJob.java:56)
    at org.htmlunit.javascript.background.JavaScriptExecutionJob.run(JavaScriptExecutionJob.java:100)
    at org.htmlunit.javascript.background.JavaScriptJobManagerImpl.runSingleJob(JavaScriptJobManagerImpl.java:433)
    at org.htmlunit.javascript.background.DefaultJavaScriptExecutor.run(DefaultJavaScriptExecutor.java:156)
    at java.base/java.lang.Thread.run(Thread.java:833)

The highest version to which I got it to work is 3.3.0. When going to 3.4.0 it starts to break.

I hope this is enough help to you, if not I'm happy to help out.

[rbri]

Hi @basimons, that sounds a bit strange, because usually the js support gets better with every version ;-) I can think about two reasons

• there is some switch in the code that now (with some htmlunit enhancements) chooses another code path
• there was some other kind of bug that hides this code path

Having a first look at https://ok12static.oktacdn.com/assets/js/sdk/okta-signin-widget/7.9.0/js/okta-sign-in.min.js shows some minified code - it will be really hard to understand the root cause of the problem. Maybe we can try together....

Is there any chance to simply reproduce the problem here? (If you like you can send me a private mail - see pom.xml)

[basimons]

Hi, I'm happy to set you up with a reproducible example.

The thing is I just don't know if it'd be super helpful. As the source that is throwing the error is not ours. We are using Okta, which is an identity provider in our SAML flow. This means that I don't have access to the original source and thus it'd be very hard to give you more than the minified version.

[rbri]

no prob you are not the first one having only the minified version :-D I only need a url and maybe a action that triggers the problem - then i can try to have a look.

[basimons]

Sure, I'll email you with some details on how to reproduce the problem. Then we can continue there if you need some more information. I rather not share the url here.

[rbri]

For the records, the version dependency is because the code contains a switch that checks for Reflect.construct like this

if ("undefined" == typeof Reflect || !Reflect.construct) return !1;

Reflect.construct method is available since 3.4.