Use 'Integer' not 'int' in queryForObject docs

Update queryForObject calls in the JDBC reference documentation to
use 'Integer.class' rather than the unsupported 'int.class'.

Issue: SPR-10651

src/reference/docbook/jdbc.xml

@@ -304,12 +304,12 @@
           <para>Here is a simple query for getting the number of rows in a
           relation:</para>
 
-          <programlisting language="java">int rowCount = this.jdbcTemplate.queryForObject("select count(*) from t_actor", int.class);</programlisting>
+          <programlisting language="java">int rowCount = this.jdbcTemplate.queryForObject("select count(*) from t_actor", Integer.class);</programlisting>
 
           <para>A simple query using a bind variable:</para>
 
           <programlisting language="java">int countOfActorsNamedJoe = this.jdbcTemplate.queryForObject(
-        "select count(*) from t_actor where first_name = ?", int.class, "Joe");</programlisting>
+        "select count(*) from t_actor where first_name = ?", Integer.class, "Joe");</programlisting>
 
           <para>Querying for a <classname>String</classname>:</para>
 
@@ -567,7 +567,7 @@ public int countOfActorsByFirstName(String firstName) {
 
     SqlParameterSource namedParameters = new MapSqlParameterSource("first_name", firstName);
 
-    return this.namedParameterJdbcTemplate.queryForObject(sql, int.class, namedParameters);
+    return this.namedParameterJdbcTemplate.queryForObject(sql, Integer.class, namedParameters);
 }</programlisting>
 
       <para>Notice the use of the named parameter notation in the value
@@ -600,7 +600,7 @@ public int countOfActorsByFirstName(String firstName) {
 
     Map&lt;String, String&gt; namedParameters = Collections.singletonMap("first_name", firstName);
 
-    return this.namedParameterJdbcTemplate.queryForObject(sql, int.class, namedParameters);
+    return this.namedParameterJdbcTemplate.queryForObject(sql, Integer.class, namedParameters);
 }</programlisting>
 
       <para>One nice feature related to the
@@ -664,7 +664,7 @@ public int countOfActors(Actor exampleActor) {
 
     SqlParameterSource namedParameters = new BeanPropertySqlParameterSource(exampleActor);
 
-    return this.namedParameterJdbcTemplate.queryForObject(sql, int.class, namedParameters);
+    return this.namedParameterJdbcTemplate.queryForObject(sql, Integer.class, namedParameters);
 }</programlisting>
 
       <para>Remember that the
@@ -860,7 +860,7 @@ public class RunAQuery {
     }
 
     public int getCount() {
-        return this.jdbcTemplate.queryForObject("select count(*) from mytable", int.class);
+        return this.jdbcTemplate.queryForObject("select count(*) from mytable", Integer.class);
     }
 
     public String getName() {