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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-441) UnconvertibleObjectException when reading code list value from PostgreSQL
Date Mon, 26 Nov 2018 11:35:00 GMT
Martin Desruisseaux created SIS-441:
---------------------------------------

             Summary: UnconvertibleObjectException when reading code list value from PostgreSQL
                 Key: SIS-441
                 URL: https://issues.apache.org/jira/browse/SIS-441
             Project: Spatial Information Systems
          Issue Type: Task
          Components: Metadata
    Affects Versions: 0.8
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux
             Fix For: 1.0


When metadata are read from database using {{org.apache.sis.sql.MetadataSource}}, an attempt
to get the {{CodeList}} value of a metadata entry produce the following error:

{noformat}
org.apache.sis.util.collection.BackingStoreException: Database error while creating a ‘Role’
object for the “IOGP” identifier.
     at org.apache.sis.metadata.sql.Dispatcher.invoke(Dispatcher.java:161)
     at org.apache.sis.metadata.sql.$Proxy233.getRole(Unknown Source)
     (…snip…)
 Caused by: org.apache.sis.metadata.sql.MetadataStoreException: Expected an instance of ‘Role’
for the “role” property, but got an instance of ‘PGobject’.
     at org.apache.sis.metadata.sql.MetadataSource.readColumn(MetadataSource.java:990)
     at org.apache.sis.metadata.sql.Dispatcher.fetchValue(Dispatcher.java:227)
     at org.apache.sis.metadata.sql.Dispatcher.invoke(Dispatcher.java:159)
 Caused by: org.apache.sis.util.UnconvertibleObjectException: Can not convert from type ‘PGobject’
to type ‘Role’.
     at org.apache.sis.internal.converter.ConverterRegistry.find(ConverterRegistry.java:528)
     (…snip…)
{noformat}

This happen only with PostgreSQL database, because we store metadata as `VARCHAR` on Derby.
The workaround is to read {{CodeList}} value using {{ResultSet.getString(int)}} instead than
{{ResultSet.getObject(…)}}, so the {{PGobject}} is converted to a {{String}} that we can
later parse as a {{CodeList}}.



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