Cannot set readonly property: class for class in groovy when initializing with map -

i trying create class , initialize values default value. have pojo in groovy, , have created initializewithdefaults method initialize values. trying pass map in constructor

class mds {     string id     string mdsname     string name     string mdstype     string mdscontext     string mdsdatetime     string mdsdomain      public static void initializewithdefaults() {         mds datasegmentiddef = new mds()         map<string, object> prop = datasegmentiddef.properties         prop.each { map.entry entry->             entry.value = "default-${entry.key}"         }          mds datasegmentid = new mds(prop)      } } 

but keep getting error

in thread "main" groovy.lang.readonlypropertyexception: cannot set readonly property: class class: com.ambuj.domain.mds  

you getting error, trying override class propery of *hashmap provided getclass() , of course not writeable.

you should take care, properties trying copy. simple experiment in groovy console looked (pay attention !prop.synthetic):

class mds {   // props    @override   string tostring() {     "$id:$mdsname:$mdsdomain"   }    static void initializewithdefaults() {     mds mds = mds.class.declaredfields.inject( new mds() ){ mds mds, prop ->       if( !prop.synthetic ) mds[ prop.name ] = "default.$prop.name"       mds     }     println mds   } }  mds.initializewithdefaults() 

and output:

result: default.id:default.mdsname:default.mdsdomain