java - Automatically instantiate Objects and set Value for a given Path -

i want set values given path string in nested java object structure. if collction property dosen't exists property should automatically instantiated:

public class {      list<b> bs;      // getter/setter }  public class b {      string b1;      string b2;      // getter/setter }   public object setvalueforpath(string path, object value){       // magic starts      // set value path      // automatically instantiate objects if nessesary   }  result = setvalueforpath("bs[0].b1", "test") // return full object structure assertequal(result.getbbs().get(0).getb1(), "test"); 

how can solve problem?

you can use ognl's sequence operator , accomplish this, make ognl expression bit more difficult read.

a = new a() ognl.setvalue("bs.add(0, new com.full.qualified.package.b()), bs[0].b1" a, "test") assertequals("test", a.getbbs().get(0).getb1())