question: gets the value of the forwardcompatibilitymap property . this accessor method returns a reference to the live list , not a snapshot . therefore any modification you make to the returned list will be present inside the jaxb object . this is why there is not a set method for the forwardcompatibilitymap property . for example , to add a new item , do as follows : getforwardcompatibilitymap . add newitem ; objects of the following type s are allowed in the list stringstringmapentry concode_field_sep Boolean isNegative concode_elem_sep Criterion criterion concode_elem_sep Double bidModifier concode_elem_sep Long campaignId concode_elem_sep String campaignCriterionType concode_elem_sep List<StringStringMapEntry> forwardCompatibilityMap concode_field_sep Boolean isIsNegative concode_elem_sep void setIsNegative concode_elem_sep void setCampaignCriterionType concode_elem_sep Criterion getCriterion concode_elem_sep Double getBidModifier concode_elem_sep Long getCampaignId concode_elem_sep void setCriterion concode_elem_sep String getCampaignCriterionType concode_elem_sep void setCampaignId concode_elem_sep void setBidModifier
target: List < StringStringMapEntry > function ( ) { if ( forwardCompatibilityMap == null ) { forwardCompatibilityMap = new ArrayList < StringStringMapEntry > ( ) ; } return this . forwardCompatibilityMap ; }