diff --git a/webapp/lib/commons-dbcp-1.2.1.jar b/webapp/lib/commons-dbcp-1.2.1.jar
deleted file mode 100644
index 08440c02e..000000000
Binary files a/webapp/lib/commons-dbcp-1.2.1.jar and /dev/null differ
diff --git a/webapp/lib/commons-dbcp-1.2.2.jar b/webapp/lib/commons-dbcp-1.2.2.jar
deleted file mode 100644
index faea05626..000000000
Binary files a/webapp/lib/commons-dbcp-1.2.2.jar and /dev/null differ
diff --git a/webapp/lib/commons-dbcp-1.4.jar b/webapp/lib/commons-dbcp-1.4.jar
new file mode 100644
index 000000000..c4c1c4f28
Binary files /dev/null and b/webapp/lib/commons-dbcp-1.4.jar differ
diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/SDBGraphGenerator.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/SDBGraphGenerator.java
index 11479df54..41e0f0c49 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/SDBGraphGenerator.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/SDBGraphGenerator.java
@@ -28,21 +28,36 @@ public class SDBGraphGenerator implements GraphGenerator {
     	this.storeDesc = storeDesc;
     	this.graphID = graphID;
     }
-    
-	public Graph generateGraph() {
-		try {
-			if ( ( this.connection == null ) || ( this.connection.isClosed() ) ) {
-				this.connection = ds.getConnection();
-			}
-			Store store = SDBFactory.connectStore(connection, storeDesc);
-			return SDBFactory.connectNamedGraph(store, graphID); 
-		} catch (SQLException e) {
-			String errMsg = "Unable to generate SDB graph"; 
-			log.error(errMsg, e);
-			throw new RuntimeException(errMsg, e);
-		}
-	}
-	
+
+    public Graph generateGraph() {
+        try {
+            if ( this.connection == null ) {
+                this.connection = ds.getConnection();
+            } else if ( this.connection.isClosed() ) {
+                try {
+                    this.connection.close();
+                } catch (SQLException e) {                  
+                    // The connection will throw an "Already closed"
+                    // SQLException that we need to catch.  We need to 
+                    // make this extra call to .close() in order to make
+                    // sure that the connection is returned to the pool.
+                    // This depends on the particular behavior of version
+                    // 1.4 of the Apache Commons connection pool library.
+                    // Earlier versions threw the exception right away,
+                    // making this impossible. Future versions may do the
+                    // same.
+                }
+                this.connection = ds.getConnection();
+            }
+            Store store = SDBFactory.connectStore(connection, storeDesc);
+            return SDBFactory.connectNamedGraph(store, graphID); 
+        } catch (SQLException e) {
+            String errMsg = "Unable to generate SDB graph"; 
+            log.error(errMsg, e);
+            throw new RuntimeException(errMsg, e);
+        }
+    }
+    	
 	public Connection getConnection() {
 		return connection;
 	}