fix build errors

db/cassandra-0.6/src/com/yahoo/ycsb/db/CassandraClient6.java

@@ -442,9 +442,9 @@ public class CassandraClient6 extends DB
 		}
 
 		HashMap<String,ByteIterator> vals=new HashMap<String,ByteIterator>();
-		vals.put("age","57");
-		vals.put("middlename","bradley");
-		vals.put("favoritecolor","blue");
+		vals.put("age",new StringByteIterator("57"));
+		vals.put("middlename",new StringByteIterator("bradley"));
+		vals.put("favoritecolor",new StringByteIterator("blue"));
 		int res=cli.insert("usertable","BrianFrankCooper",vals);
 		System.out.println("Result of insert: "+res);
 

db/mongodb/src/com/yahoo/ycsb/db/MongoDbClient.java

@@ -14,6 +14,7 @@ import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Properties;
 import java.util.Set;
+import java.util.Map;
 import java.util.Vector;
 
 import org.bson.types.ObjectId;

src/com/yahoo/ycsb/StringByteIterator.java

@@ -44,8 +44,8 @@ public class StringByteIterator extends ByteIterator {
 	 * Create a copy of a map, converting the values from Strings to
 	 * StringByteIterators.
 	 */
-	public static Map<String, ByteIterator> getByteIteratorMap(Map<String, String> m) {
-		Map<String, ByteIterator> ret =
+	public static HashMap<String, ByteIterator> getByteIteratorMap(Map<String, String> m) {
+		HashMap<String, ByteIterator> ret =
 			new HashMap<String,ByteIterator>();
 
 		for(String s: m.keySet()) {
@@ -58,8 +58,8 @@ public class StringByteIterator extends ByteIterator {
 	 * Create a copy of a map, converting the values from
 	 * StringByteIterators to Strings.
 	 */
-	public static Map<String, String> getStringMap(Map<String, ByteIterator> m) {
-		Map<String, String> ret = new HashMap<String,String>();
+	public static HashMap<String, String> getStringMap(Map<String, ByteIterator> m) {
+		HashMap<String, String> ret = new HashMap<String,String>();
 
 		for(String s: m.keySet()) {
 			ret.put(s, m.get(s).toString());;