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ObjectMapper mapper = new ObjectMapper();
 JavaType javaType = mapper.getTypeFactory().constructParametricType(List.class, ApprWritUnionFormModel.class);
 /*List writUnionFormList = 
  JSON.parseArray(params, FormModel.class);*/
 List writUnionFormList=new ArrayList();
 try {
  writUnionFormList = (List)mapper.readValue(params, javaType);
 } catch (JsonParseException e) {
  e.printStackTrace();
 } catch (JsonMappingException e) {
  e.printStackTrace();
 } catch (IOException e) {
  e.printStackTrace();
 }

List writUnionFormList = 
  JSON.parseArray(params, FormModel.class);