Table Reader: Cannot be cast to class

[mwiegand]

Yes, it is persistent even after restarting Knime. I also placed a new Table reader outside of any Component to eliminate additional factors.

Update 1
I further closed in on the issue. The column “Posts” (collection of XML) is at fault. It is triggered when scraping this post:

3D-e-Chem extension cannot be installed in KNIME 4.7 or 5.1

Dear everybody, I recently switched from KNIME AP 4.6 to 4.7 and I realised that the 3D-e-chem extension is no longer available for this KNIME version. The same is true for KNIME 5.1. As this extension is extremely valuable for cheminformatics tasks I’ve tried to install it from the KNIME 4.6 repository (i.e. https://update.knime.com/community-contributions/4.6). After enabling this repo I can correctly see the 3D-e-Chem extension in the extensions list but if I try to install it, I receive th…

Even attempting an unpivot of this fails:

ERROR Ungroup 3:1126:0:1018:0:1115 Execute failed: class org.knime.core.data.columnar.table.ColumnarContainerTableLoader$SavedColumnarContainerTable cannot be cast to class org.knime.core.data.container.BufferedContainerTable (org.knime.core.data.columnar.table.ColumnarContainerTableLoader$SavedColumnarContainerTable is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @4d001a14; org.knime.core.data.container.BufferedContainerTable is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @4ae5ddc0)

80327 data upon issue only Posts.table.txt (14.6 KB)

Intriguingly, converting the collection to string, then back to XML and into a list does not cause any issue

I am inspecting the data row by now to identify the cause. Something about the data is converted poorly I believe.

Update 2
I narrowed it down to html attributes. Though there is nothing odd at first glance in the html code. It is reproducible when converting to string and back to XML. Using the String Cleaner did not resolve it.

While removing each html attribute to sort good from bad I also faced another but similar error:

ERROR InplaceSaveRunnable             Could not save workflow - this exception will be re-thrown as an InterruptedException.
ERROR WorkflowEditor                  Could not save workflow: Could not save workflow: Error while writing to buffer: class org.knime.core.data.columnar.table.ColumnarContainerTableLoader$SavedColumnarContainerTable cannot be cast to class org.knime.core.data.container.BufferedContainerTable (org.knime.core.data.columnar.table.ColumnarContainerTableLoader$SavedColumnarContainerTable is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @4d001a14; org.knime.core.data.container.BufferedContainerTable is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @4ae5ddc0)