This patch is taken from gentoo (https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-java/avalon-logkit/files/avalon-logkit-2.1-java7.patch).

It adds missing implementations of abstract methods.

diff -Nur avalon-logkit-2.1/src/java/org/apache/log/output/db/DefaultDataSource.java avalon-logkit-2.1_patched//src/java/org/apache/log/output/db/DefaultDataSource.java

--- avalon-logkit-2.1/src/java/org/apache/log/output/db/DefaultDataSource.java	2005-08-30 05:03:49.000000000 +0300

+++ avalon-logkit-2.1_patched//src/java/org/apache/log/output/db/DefaultDataSource.java	2011-09-27 08:27:49.313005212 +0300

@@ -20,7 +20,9 @@

 import java.sql.Connection;

 import java.sql.DriverManager;

 import java.sql.SQLException;

+import java.sql.SQLFeatureNotSupportedException;

 import javax.sql.DataSource;

+import java.util.logging.Logger;

 /**

  * A basic datasource that doesn't do any pooling but just wraps

@@ -111,4 +113,16 @@

     {

         m_logWriter = logWriter;

     }

+

+    public boolean isWrapperFor(Class cls) {

+        return false;

+    }

+ 

+    public Object unwrap(Class cls) throws SQLException {

+        throw new SQLException("Not a wrapper for " + cls);

+    }

+    

+    public Logger getParentLogger() throws SQLFeatureNotSupportedException {

+        throw new SQLFeatureNotSupportedException("Not a supported feature");

+    }

 }