Custom data source problem: {some class} cannot be resolved to a type

Changed Severity from Minor to Major

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System Message

Changed Status from New to Feedback Requested

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Hi, can you confirm you used the "Custom implementation of JRDataSource" data adapter? Is the data adapter including the jar reference in the "Jar File Path" section? Or did you simply included the DA in the project classpath where your report is created?Let me know if you can successfully use it, creating the DA adapter file inside the Project folder. Thanks.Regards,Massimo.

Indeed I am using the 'Custom implementation of JRDataSource".

 

The jar file is not referenced in the adaptor: https://share.getcloudapp.com/xQu70Xkw . The jar file is part of a library https://share.getcloudapp.com/JruD7JYy and has been added via user library (https://share.getcloudapp.com/yAurLEqw) to the build path https://share.getcloudapp.com/QwuAGm1J .

 

To get closer to issue at hand I created a new dummy adaptor to illustrate the problem.

 

It is a new fresh new implementation which is based on the documentation in https://community.jaspersoft.com/wiki/how-create-and-use-jrdatasourceprovider-adapter. I called it my Hello World New Data Adaptor. I didn't use a jar. As you can see https://share.getcloudapp.com/d5uAe7Jj doesn't contain a jar.

I now created a new blank new report. The adaptor works fine up to the point where I reference a class from the adaptor. In https://share.getcloudapp.com/wbu6klDD I simply used the following expression (HelloWorldCustomDataProvider.HelloWorldCustomDataSource) $P{REPORT_DATA_SOURCE} .

 

I've added the files to this message. As such you can also test it.

 

T.

 

 

Apparently I can only upload one file at a time. Here is the code for the Hello World Adaptor.

I just tested our plugin with TIBCO Jaspersoft® Studio 6.16.0 - Visual Designer for JasperReports 6.16.0. And our Custom implementation of JRDataSource runs fine.

Hi, I think the problem you are experiencing inside comment #3 is related to another issue with classpath that has been described in bug #13616. You could give it a try to see if the solution proposed with this patch here addresses the problem of sources in the project:

https://community.jaspersoft.com/jaspersoft-studio/issues/13616#comment-873711

 

Let me know.

 

Indeed there are other issues as well, because I've experienced some problems with the usage of the libraries added to the project.

Still investigating. Thanks.

 

Best regards,

Massimo.

Hello Massimo

 

Thank you for your assistance. The patch works indeed.

 

I assume that the patch will be integrated in the next version of the studio?

 

Best regards,

Thomas

Hi Thomas,

yes it will be integrated. Did it help also for the "jar" use-case, besides the "code-in-project" scenario?

 

Thanks,

Massimo.

Yes it also helped us in the 'jar' use-case.

Changed Priority from Normal to High

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Hi,I think i'm having same problem while trying to import a custom JAR into the classpath. How can I try the same patch?Thanks

see #6 Posted by mrabbi on June 11, 2021 - 3:45pm . Works fine.

Changed Resolution from Open to Fixed

Changed Status from Feedback Requested to Resolved

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Changed Resolution from Fixed to Reopened

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Dear MassimoSome of my colleagues are using windows to develop reports. They feel more comfortable using that OS. However we are running into the same problems as MAC OS X: {some class} cannot be resolved to a type.When I test the data adaptor then the code loaded and working. However when the report is running, the class references cannot be resolved.I applied the same patch as MAC OS X but that doesn't work. How can I solve the problem?Thomas

Changed Resolution from Reopened to Fixed

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Hi Thomas please give it a try looking at the following comment: https://community.jaspersoft.com/jaspersoft-studio/issues/13656#comment-875391Use the newer patch (that includes also the previous fix). Now the problem should be solved.As you see in that bug Michael confirmed it is now working ok for both functions and chart customizers as well.Regards,Massimo.P.S: there is no difference for Mac or Windows. That patch can be applied in the same way. You can drop it into the plugins folder of your/theirs installation (which of course is different depending on the OS). As said for Mac, it might help starting the Jaspersoft Studio using the -clean flag (the first time only after patch applying).

Hello Massimo

 

It works now. Thank you for your assistance. I didn't look carefully at the jars name and didn't applied the patch correctly. Thank you for the quick response.

 

Thomas

I'm glad it worked Thomas!

 

Best regards,

Massimo.