Let us verify. What does this tell you:

<cfoutput>#HelloWorldApp.getClass().getName()#</cfoutput>

I am surprised that isInstanceOf misses the HelloWorldApp instance of "example.HelloWorld". That seems buggy to me. Does it do better with the default constructor? That is

HelloWorldApp = CreateObject("java","example.HelloWorld").init();

writeOutput(isInstanceOf(HelloWorldApp,"example.HelloWorld"));

I was wondering whether it had something to do with the package. Is example a package name?

I wondered whether isInstanceOf expects just the class name, HelloWorld, and not the fully qualified name, example.HelloWorld. Will this work:

HelloWorldApp = CreateObject("java","example.HelloWorld");

writeOutput(isInstanceOf(HelloWorldApp,"HelloWorld"));

I have been looking for clues on how isInstanceOf handles types defined with package names. I found very little in ColdFusion's documentation. So, I am looking into Java's documentation on instanceOf.

I have not been looking for a way to do it with Java's instanceof operator. That would be running away. I have been looking at how instanceof is used with fully qualified names, hoping to learn something from there. 

However, I have only been able to confirm that your original code is correct, and should work! I am wondering whether it fails in your case because of the classpath.

What is the absolute path of the directory that contains 'example.HelloWorld'? Go to the ColdFusion administrator. Click on the button for information. Is the directory in the classpath?

OK. Moving on, two tests:

<p>

    1st test: Case sensitivity<br>

<cfscript>

helloworldapp = createObject("java","example.HelloWorld");

writeOutput(isInstanceOf(helloworldapp,"example.HelloWorld"));

</cfscript>

</p>

<p>

    2nd test: cfobject<br>

<cfobject action="create" name="helloworldapp" type="java" class="example.HelloWorld">

<cfoutput>#isInstanceOf(helloworldapp,"example.HelloWorld"))#</cfoutpu t>

</p>

For want of a better idea, jot down the absolute path of the directory that contains /example/HelloWorld.class. Add that path to your loadPaths attribute. Incidentally, how do your dynamic settings this.javaSettings look like?

Thorough! Thanks.

The test I last suggested is therefore:

this.javaSettings.loadPaths = ['.\', '.\jars\','.\jars\cfjavatest.jar'];

That should cover them all.

No! What's going on?

Ok, let's now test one which we know is a yes. 

myGateway = CreateObject("java","examples.JMS.JMSGateway");

writeOutput(isInstanceOf(myGateway,"examples.JMS.JMSGateway"));

If that gives a Yes, then the next test I would perform is a server restart(if that is possible). If it gives a No, then we know what we have in our hands.

Kirill_Grishin wrote:

 

Yes, the test for "examples.JMS.JMSGateway" gave a YES.

That's a relief. So there is still hope.

Could you send me the JAR file? I have mailed you my e-mail address.

Thanks for the JAR file. Here follows my progress report.

As a first test, I commented out the code this.javasettings=.... I unpacked the JAR file and copied its contents (example and scala directories) to C:\ColdFusion10\cfusion\wwwroot\WEB-INF\classes\. I restarted ColdFusion. When I run your original isInstanceOf code, I get a Yes.

@Kirill_Grishin

I decided to round this up before the end of the year. I am sorry I haven't been able to do better than find the above workarounds.

IsInstanceOf(helloworldapp,"example.HelloWorld")) continues to return No for dynamic Java settings. I have reproduced the behaviour using every conceivable directory structure in the loadPaths attribute in this.javaSettings. As far as I can see, what you have discovered is a bug.

Please consider filing a bug report. In fact, someone reported a similar bug (3121307) as far back as February 2012, when ColdFusion 10 was still in pre-release beta. Apparently that problem remains unsolved!