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https://issues.apache.org/jira/browse/GUACAMOLE-942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17028544#comment-17028544
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Mike Jumper commented on GUACAMOLE-942:
---------------------------------------
For that invalid {{IN AND}} to occur within a query, an attempt would have to
be made to retrieve the connections for an empty set of connection identifiers.
From the MyBatis XML defining the relevant query (the MySQL implementation of
{{selectReadable()}} within {{ConnectionMapper.xml}}):
{code:none}
...
WHERE guacamole_connection.connection_id IN
<foreach collection="identifiers" item="identifier"
open="(" separator="," close=")">
#{identifier,jdbcType=VARCHAR}
</foreach>
AND ...
{code}
{{IN AND}} will only occur if {{identifiers}} is empty, but there is an
explicit check for that condition prior to {{selectReadable()}} being invoked:
https://github.com/apache/guacamole-client/blob/1.1.0/extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/base/ModeledDirectoryObjectService.java#L392-L394
Can you enable debug-level logging and post the full stack trace behind the
error you're seeing?
> MySQL JDBC contains an invalid SQL Query (no RDP Start possible)
> ----------------------------------------------------------------
>
> Key: GUACAMOLE-942
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-942
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-auth-jdbc-mysql
> Affects Versions: 1.1.0
> Environment: CentOS 8
> Tomcat 9.0.30
> Guacamole 1.1.0, freshly upgraded from 0.9.14.
> LDAP backend
> JDBC MySQL connector 5.1.46 to MariaDB.
> Reporter: Stefan Bluhm
> Priority: Major
>
> After logging in and selecting an RDP connection, the connection fails with:
>
> "The remote desktop server is currently not unreachable."...
>
> The catalona.out log shows the following error:
> {code:none}
> 17:02:02.435 [http-nio-8080-exec-3] ERROR o.a.g.rest.RESTExceptionMapper -
> Unexpected internal error:
> ### Error querying database. Cause:
> com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error
> in your SQL syntax; check the manual that corresponds to your MariaDB server
> version for the right syntax to use near 'AND
> (
> guacamole_connection_permission.entity_id = 7
> ' at line 19
> ### The error may exist in
> org/apache/guacamole/auth/jdbc/connection/ConnectionMapper.xml
> ### The error may involve defaultParameterMap
> ### The error occurred while setting parameters
> ### SQL: SELECT guacamole_connection.connection_id,
> guacamole_connection.connection_name, parent_id, protocol, max_connections,
> max_connections_per_user, proxy_hostname, proxy_port,
> proxy_encryption_method, connection_weight, failover_only, MAX(start_date) AS
> last_active FROM guacamole_connection JOIN guacamole_connection_permission ON
> guacamole_connection_permission.connection_id =
> guacamole_connection.connection_id LEFT JOIN guacamole_connection_history ON
> guacamole_connection_history.connection_id =
> guacamole_connection.connection_id WHERE guacamole_connection.connection_id
> IN AND ( guacamole_connection_permission.entity_id = ? ) AND permission =
> 'READ' GROUP BY guacamole_connection.connection_id; SELECT
> primary_connection_id, guacamole_sharing_profile.sharing_profile_id FROM
> guacamole_sharing_profile JOIN guacamole_sharing_profile_permission ON
> guacamole_sharing_profile_permission.sharing_profile_id =
> guacamole_sharing_profile.sharing_profile_id WHERE primary_connection_id IN
> AND ( entity_id = ? ) AND permission = 'READ'; SELECT
> guacamole_connection_attribute.connection_id, attribute_name, attribute_value
> FROM guacamole_connection_attribute JOIN guacamole_connection_permission ON
> guacamole_connection_permission.connection_id =
> guacamole_connection_attribute.connection_id WHERE
> guacamole_connection_attribute.connection_id IN AND ( entity_id = ? ) AND
> permission = 'READ';
> ### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You
> have an error in your SQL syntax; check the manual that corresponds to your
> MariaDB server version for the right syntax to use near 'AND
> (
> guacamole_connection_permission.entity_id = 7
> ' at line 19
> {code}
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