PI help

Hello,

I am new to SAP PI.

I am creating  a scenario where - 

source message format is as below :

<Record>

<text>

emp id, joining_date [dd.mm.yy],name,address,reporting_date [dd.mm.yy]

</text>

</Record>

destination message format is as below :

<Record>

<emp id>

<joining_date [yyyymmdd]>

<name>

<address>

<reporting_date [yyyymmdd]   ---- if reporting date is less than 2 days from current date, 00000000 will get populated in this field.

</Record>

I am facing problem in UDF creation in java message mapping.

Can anyone please guide me regarding this ?

Regards,

Murari