change HibernateConfiguration.showSql from boolean to Boolean

wizard-server/src/main/java/org/cobbzilla/wizard/server/config/HibernateConfiguration.java

@@ -12,7 +12,9 @@ public class HibernateConfiguration {
     @Getter @Setter private String[] entityPackages;
 
     @Getter @Setter private String dialect;
-    @Getter @Setter private boolean showSql = false;
+    @Getter @Setter private Boolean showSql = false;
+    public boolean showSql() { return showSql != null && showSql; }
+
     @Getter @Setter private String hbm2ddlAuto;
     @Getter @Setter private String validationMode;
     @Getter @Setter private boolean applyValidatorToDDL = true;

wizard-server/src/main/java/org/cobbzilla/wizard/spring/config/rdbms/RdbmsConfigCommon.java

@@ -86,7 +86,7 @@ public class RdbmsConfigCommon {
         final HibernateConfiguration hibernateConfiguration = getDatabase().getHibernate();
         final Properties properties = new Properties();
         properties.put("hibernate.dialect", hibernateConfiguration.getDialect());
-        properties.put("hibernate.show_sql", hibernateConfiguration.isShowSql());
+        properties.put("hibernate.show_sql", hibernateConfiguration.showSql());
         properties.put("hibernate.hbm2ddl.auto", hibernateConfiguration.getHbm2ddlAuto());
         properties.put("hibernate.validator.apply_to_ddl", hibernateConfiguration.isApplyValidatorToDDL());
         properties.put("javax.persistence.verification.mode", hibernateConfiguration.getValidationMode());