enable optimistic locking for m_loan

mifosng-provider/src/main/java/org/mifosplatform/portfolio/loanaccount/domain/Loan.java

@@ -35,6 +35,7 @@ import javax.persistence.Temporal;
 import javax.persistence.TemporalType;
 import javax.persistence.Transient;
 import javax.persistence.UniqueConstraint;
+import javax.persistence.Version;
 
 import org.apache.commons.lang.ObjectUtils;
 import org.apache.commons.lang.StringUtils;
@@ -118,6 +119,9 @@ import com.google.gson.JsonPrimitive;
         @UniqueConstraint(columnNames = { "external_id" }, name = "loan_externalid_UNIQUE") })
 public class Loan extends AbstractPersistable<Long> {
 
+    @Version
+    int version;
+
     @Column(name = "account_no", length = 20, unique = true, nullable = false)
     private String accountNumber;
 

mifosng-provider/src/main/resources/sql/migrations/core_db/V223__add_version_for_m_loan_account.sql

@@ -0,0 +1,2 @@
+ALTER TABLE `m_loan`
+	ADD COLUMN `version` INT(15) NOT NULL DEFAULT '1' AFTER `create_standing_instruction_at_disbursement`;