https://bz.apache.org/bugzilla/show_bug.cgi?id=70011
Bug ID: 70011
Summary: org.apache.tomcat.jdbc.pool.ProxyConnection does not
honour java.sql.Wrapper
Product: Tomcat Modules
Version: unspecified
Hardware: PC
OS: Mac OS X 10.1
Status: NEW
Severity: normal
Priority: P2
Component: jdbc-pool
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
In some JDBC drivers, the Connection may be double wrapped. Example:
For postgresql there is a PGConnection object which is typically wrapped as
follows:
org.apache.tomcat.jdbc.pool.ProxyConnection unwrap(PGConnection.class) ->
org.postgresql.jdbc.PGConnection
However, there are drivers that add additional features which wraps the
PGConnection like this (in the case of the aws advanced jdbc driver)
org.apache.tomcat.jdbc.pool.ProxyConnection unwrap(ConnectionWrapper.class)
->
software.amazon.jdbc.wrapper.ConnectionWrapper
unwrap(PGConnection.class) ->
org.postgresql.jdbc.PGConnection
When libraries that consume the ProxyConnection.class calls it's unwrap method,
it is reasonable to expect it follow the specification of the Wrapper
interface:
https://docs.oracle.com/javase/8/docs/api/java/sql/Wrapper.html
Which states:
return the the result of calling unwrap recursively on the wrapped object
or a proxy for that result
However ProxyConnection does not do this, and so this creates a bug in the case
of the AWS Advanced JDBC driver and an exeption that states:
java.sql.SQLException: Not a wrapper of org.postgresql.PGConnection
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