Get list of all Values which is of type String in java [duplicate]

I am tring to get List<String> of all values of POJO

Employee e = new Employee();
e.setAddr("addr");
e.setName("name");
List<String> values= new ArrayList();
Field[] declaredFields = e.getClass().getDeclaredFields();
        for(Field f : declaredFields){
               Class t = f.getType();
              if(t == String.class) {
                  Object object = f.get(f.getName());
                  values.add(object);
               }
            }
// Expected values = ["name","addr"]
   class Employee{
     private String name;
     private String address;
     ...
    }

Getting exception

at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171) at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:58) at java.base/jdk.internal.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36) at java.base/java.lang.reflect.Field.get(Field.java:418)