Fix [serial] compiler warnings

Fix serialization warnings by applying @SuppressWarnings("serial")
when appropriate.

In certain cases and for unknown reasons, a correctly-placed
@SuppressWarnings("serial") annotation will fix the warning at the
javac level (i.e. the Gradle command-line), but will produce an
"unnecessary @SuppressWarnings" warning within Eclipse. In these
cases, a private static final serialVersionUID field has been added
with the default value of 1L.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/ConfigurableJtaPlatform.java

@@ -31,6 +31,7 @@ import org.springframework.util.Assert;
  * @author Juergen Hoeller
  * @since 3.1.2
  */
+@SuppressWarnings("serial")
 class ConfigurableJtaPlatform extends AbstractJtaPlatform {
 
 	private final TransactionManager transactionManager;

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateJdbcException.java

@@ -30,6 +30,7 @@ import org.springframework.dao.UncategorizedDataAccessException;
  * @since 3.1
  * @see SessionFactoryUtils#convertHibernateAccessException
  */
+@SuppressWarnings("serial")
 public class HibernateJdbcException extends UncategorizedDataAccessException {
 
 	public HibernateJdbcException(JDBCException ex) {

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateObjectRetrievalFailureException.java

@@ -29,6 +29,7 @@ import org.springframework.orm.ObjectRetrievalFailureException;
  * @since 3.1
  * @see SessionFactoryUtils#convertHibernateAccessException
  */
+@SuppressWarnings("serial")
 public class HibernateObjectRetrievalFailureException extends ObjectRetrievalFailureException {
 
 	public HibernateObjectRetrievalFailureException(UnresolvableObjectException ex) {

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateOptimisticLockingFailureException.java

@@ -29,6 +29,7 @@ import org.springframework.orm.ObjectOptimisticLockingFailureException;
  * @since 3.1
  * @see SessionFactoryUtils#convertHibernateAccessException
  */
+@SuppressWarnings("serial")
 public class HibernateOptimisticLockingFailureException extends ObjectOptimisticLockingFailureException {
 
 	public HibernateOptimisticLockingFailureException(StaleObjectStateException ex) {

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateQueryException.java

@@ -28,6 +28,7 @@ import org.springframework.dao.InvalidDataAccessResourceUsageException;
  * @since 3.1
  * @see SessionFactoryUtils#convertHibernateAccessException
  */
+@SuppressWarnings("serial")
 public class HibernateQueryException extends InvalidDataAccessResourceUsageException {
 
 	public HibernateQueryException(QueryException ex) {

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateSystemException.java

@@ -29,6 +29,7 @@ import org.springframework.dao.UncategorizedDataAccessException;
  * @since 3.1
  * @see SessionFactoryUtils#convertHibernateAccessException
  */
+@SuppressWarnings("serial")
 public class HibernateSystemException extends UncategorizedDataAccessException {
 
 	/**

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/SpringJtaSessionContext.java

@@ -30,6 +30,7 @@ import org.springframework.transaction.support.TransactionSynchronizationManager
  * @author Juergen Hoeller
  * @since 3.1
  */
+@SuppressWarnings("serial")
 public class SpringJtaSessionContext extends JTASessionContext {
 
 	public SpringJtaSessionContext(SessionFactoryImplementor factory) {