Bruno's answer is correct, but it's always better to check for null value before trying to convert in order to avoid an exception.
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if(this.getOrderDate()!=null)
InternalVO.setOrderDate_DRQJ(this.getOrderDate().getTime());
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I usually create a second accessor with Calendar type:
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public void setOrderDate_DRQJ(Calendar dateCalendar)
{
if(dateCalendar ==null)
this.orderDate_DRQJ = null;
else
this.orderDate_DRQJ = dateCalendar.getTime();
}
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Having created this second accessor for InternalVO data type, you assign JDE date with Java date simply as:
InternalVO.setOrderDate_DRQJ(this.getOrderDate());