diff --git a/hikaricp-java6/src/main/java/com/zaxxer/hikari/util/DriverDataSource.java b/hikaricp-java6/src/main/java/com/zaxxer/hikari/util/DriverDataSource.java
index d54fcc45..7f3f199d 100644
--- a/hikaricp-java6/src/main/java/com/zaxxer/hikari/util/DriverDataSource.java
+++ b/hikaricp-java6/src/main/java/com/zaxxer/hikari/util/DriverDataSource.java
@@ -17,6 +17,7 @@ package com.zaxxer.hikari.util;
 
 import java.io.PrintWriter;
 import java.sql.Connection;
+import java.sql.Driver;
 import java.sql.DriverManager;
 import java.sql.SQLException;
 import java.sql.SQLFeatureNotSupportedException;
@@ -28,8 +29,7 @@ public final class DriverDataSource implements DataSource
 {
    private final String jdbcUrl;
    private final Properties driverProperties;
-
-   private PrintWriter logWriter;
+   private final Driver driver;
 
    public DriverDataSource(String jdbcUrl, Properties properties, String username, String password)
    {
@@ -43,7 +43,7 @@ public final class DriverDataSource implements DataSource
             driverProperties.put("password", driverProperties.getProperty("password", password));
          }
 
-         DriverManager.getDriver(jdbcUrl);
+         driver = DriverManager.getDriver(jdbcUrl);
       }
       catch (SQLException e) {
          throw new RuntimeException("Unable to get driver for JDBC URL " + jdbcUrl, e);
@@ -65,13 +65,13 @@ public final class DriverDataSource implements DataSource
    @Override
    public PrintWriter getLogWriter() throws SQLException
    {
-      return logWriter;
+      throw new SQLFeatureNotSupportedException();
    }
 
    @Override
    public void setLogWriter(PrintWriter logWriter) throws SQLException
    {
-      this.logWriter = logWriter;
+      throw new SQLFeatureNotSupportedException();
    }
 
    @Override
@@ -88,7 +88,7 @@ public final class DriverDataSource implements DataSource
 
    public java.util.logging.Logger getParentLogger() throws SQLFeatureNotSupportedException
    {
-      throw new SQLFeatureNotSupportedException();
+      return driver.getParentLogger();
    }
 
    @Override
diff --git a/hikaricp/src/main/java/com/zaxxer/hikari/util/DriverDataSource.java b/hikaricp/src/main/java/com/zaxxer/hikari/util/DriverDataSource.java
index d54fcc45..7f3f199d 100644
--- a/hikaricp/src/main/java/com/zaxxer/hikari/util/DriverDataSource.java
+++ b/hikaricp/src/main/java/com/zaxxer/hikari/util/DriverDataSource.java
@@ -17,6 +17,7 @@ package com.zaxxer.hikari.util;
 
 import java.io.PrintWriter;
 import java.sql.Connection;
+import java.sql.Driver;
 import java.sql.DriverManager;
 import java.sql.SQLException;
 import java.sql.SQLFeatureNotSupportedException;
@@ -28,8 +29,7 @@ public final class DriverDataSource implements DataSource
 {
    private final String jdbcUrl;
    private final Properties driverProperties;
-
-   private PrintWriter logWriter;
+   private final Driver driver;
 
    public DriverDataSource(String jdbcUrl, Properties properties, String username, String password)
    {
@@ -43,7 +43,7 @@ public final class DriverDataSource implements DataSource
             driverProperties.put("password", driverProperties.getProperty("password", password));
          }
 
-         DriverManager.getDriver(jdbcUrl);
+         driver = DriverManager.getDriver(jdbcUrl);
       }
       catch (SQLException e) {
          throw new RuntimeException("Unable to get driver for JDBC URL " + jdbcUrl, e);
@@ -65,13 +65,13 @@ public final class DriverDataSource implements DataSource
    @Override
    public PrintWriter getLogWriter() throws SQLException
    {
-      return logWriter;
+      throw new SQLFeatureNotSupportedException();
    }
 
    @Override
    public void setLogWriter(PrintWriter logWriter) throws SQLException
    {
-      this.logWriter = logWriter;
+      throw new SQLFeatureNotSupportedException();
    }
 
    @Override
@@ -88,7 +88,7 @@ public final class DriverDataSource implements DataSource
 
    public java.util.logging.Logger getParentLogger() throws SQLFeatureNotSupportedException
    {
-      throw new SQLFeatureNotSupportedException();
+      return driver.getParentLogger();
    }
 
    @Override
diff --git a/hikaricp/src/test/java/com/zaxxer/hikari/MiscTest.java b/hikaricp/src/test/java/com/zaxxer/hikari/MiscTest.java
index 852d276c..47f76a6c 100644
--- a/hikaricp/src/test/java/com/zaxxer/hikari/MiscTest.java
+++ b/hikaricp/src/test/java/com/zaxxer/hikari/MiscTest.java
@@ -84,10 +84,68 @@ public class MiscTest
    }
 
    @Test
-   public void testBagDump()
+   public void testConcurrentBag() throws InterruptedException
    {
-      ConcurrentBag<BagEntry> bag = new ConcurrentBag<BagEntry>(null);
+      class TestBagEntry extends BagEntry {
+      }
+
+      ConcurrentBag<TestBagEntry> bag = new ConcurrentBag<TestBagEntry>(null);
+      Assert.assertEquals(0, bag.values(8).size());
+
+      TestBagEntry reserved = new TestBagEntry();
+      bag.add(reserved);
+      bag.reserve(reserved);      // reserved
+
+      TestBagEntry notinuse = new TestBagEntry();
+      bag.add(new TestBagEntry()); // not in use
+      
+      TestBagEntry inuse = new TestBagEntry();
+      bag.add(inuse);
+      bag.borrow(2L, TimeUnit.SECONDS); // in use
+      
       bag.dumpState();
+
+      try {
+         bag.requite(reserved);
+         Assert.fail();
+      }
+      catch (IllegalStateException e) {
+         // pass
+      }
+
+      try {
+         bag.remove(notinuse);
+         Assert.fail();
+      }
+      catch (IllegalStateException e) {
+         // pass
+      }
+
+      try {
+         bag.unreserve(notinuse);
+         Assert.fail();
+      }
+      catch (IllegalStateException e) {
+         // pass
+      }
+
+      try {
+         bag.remove(inuse);
+         bag.remove(inuse);
+         Assert.fail();
+      }
+      catch (IllegalStateException e) {
+         // pass
+      }
+
+      bag.close();
+      try {
+         bag.add(new TestBagEntry());
+         Assert.fail();
+      }
+      catch (IllegalStateException e) {
+         // pass
+      }
    }
 
    @Test