java - GWT Deferred Binding and Dependency Injection -

assuming have so

interface

interface isinterface {} 

implementation classes

public concreteclassa implements isinterface {   injectora a, injectorb c, injectorc c;   @inject  concreteclassa(injectora a, injectorb b, injectorc c) {    this.a = a;    this.b = b;    .....  }  }  public concreteclassb implements isinterface {   injectora a, injectorb b, injectorc c;   @inject  concreteclassb(injectora a, injectorb b, injectorc c) {    this.a = a;    this.b = b;    .....  }  } 

..and decide use gwt deferred binding in gwt module.gwt.xml

//pseudo xml configuration if (type isinterface)     if toggle == use concreteclass else use concreteclassb 

now, when try run this. won't work because gwt expected concrete class , b have default 0 constructor. so, tried following on concrete class

 @inject  injectora a;   @inject  injectorb b;  @inject  injectorc c;   concreteclassa() {   } 

which bypass 0 constructor error gives me nullpointerexception when try use a, b or c. 1 way make work remove @inject , use gwt.create() so

 injectora a, injectorb b, injectorc c;   concreteclassa() {    this.a = gwt.create(injectora.class);    .....    .....  } 

this work if injectora, injectorb , injectorc have none 0 constructor , depended heavily on @inject. dont want go through classes create 0 constructors , replace @inject gwt.create(). there has better way this. missing here?

found solution this

interface isinterface {  @inject  void init(injectora a, injectorb b, ...); }  public concreteclassa implements isinterface {   injectora a, injectorb c, injectorc c;  concreteclassa() {}  @override  public void init(injectora a, injectorb b, ..) {   this.a = a;   this.b = b;   ....  }  }