Connecting to existing Port Types

Hello everyone,

I am currently looking into developing a new Predictor node for the “Random Forest Learner”. Since this is my first node, I simply copied the code of the “Random Forest Predictor” into my custom files generated by the “New Node Wizard” just see if it would work, but when I want to use the created node, I receive the error “inporttype[0] must not be null!”. Somehow I can’t connect my node to the existing TreeEnsembleModelPortObject, eventhough they use the same class and also share the same extension point. Since I can’t find any documentation on this topic, can some of the more experienced developers help me?

Kind regards,

Hi Morris,

could you share the code?


Hello Miguel,

the code is exactly the same as in the KNIME Implementation (here), just copied to the different class files generated by the New Node Wizard (with renamed package and class declaration of course). For the factory class, I used the second factory (here). My plugin.xml: <?xml version="1.0" encoding="UTF-8"?>

<?eclipse version="3.0"?>

If you need the code, I can also upload it, but since it is just copied from KNIME I didn’t include it in this post. Thanks for the help!

Morrisplugin.xml (975 Bytes)

Hi @Morris_Kurz,
In your plugin.xml you are also defining the same port object spec as in the tree ensembles plugin which will not be compatible with the existing one, as it is in a different plugin. Instead you want to add a dependency on the org.knime.base.treeensembles plug-in and then use the port object defined there.

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Hi @gab1one,

it worked like a charm, I added the dependency in eclipse under the “Dependency” category in the plugin.xml file. Thanks for the quick help!


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