After re-deploying a *VDB *(with a syntax errors this time), the system throws several warnings (until the server is stopped) related to the undeployed VDB.
The errors are of type:
Caused by: org.teiid.core.TeiidProcessingException: TEIID31099 VDB ...
This should not be happening, since the VDB was undeployed.
To be notice that the VDB has External Materialization.