public class StringTransformer {

   public static void main(String[] args) {
      String str = "project id=\"some_integer1\" project=\"some_integer2\" template=\"some_integer3\"";

      final String stringToReplace = "some_integer1";
      final int replacement =  5 ;

      str = str.replace(stringToReplace, String.valueOf(replacement));
      
      System.out.println("String after modification :[" + str + "]");
   } 

SOME_FUNCTION(
    IN SOME_STRING VARCHAR( 32000 ), 
    IN INT1 INT,  
    OUT RESULT_STRING VARCHSR( 32000 ) )

public class StringTransformer {

   public static void main(String[] args) {
      String str = "project id=\"0\" project=\"0\" template=\"0\"";

      final String stringToReplace = "some_integer1";
      final int replacement = INT1;

      str = str.replace(stringToReplace, String.valueOf(replacement));
      
      /*   Вместо:
            System.out.println("String after modification :[" + str + "]");
            
            str должен идти на выход (RESULT_STRING)
      */
            
   }