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I googled but couldn't find any answer.
I am planning to use GWT. I want to know if I can use spring in my GWT code to use the dependency injection framework? I am not talking about GWT gui interaction with backend spring app.
The reason I am asking is the GWT code gets compiled to JavaScript and this is what gets executed in browser. If I am using spring code in that, then would it work or for that matter any other library like log4j, etc.?
Or the GUI code have to be pure GWT API only?
For example,
public class MyTable {
private Button myButton;
@Autowired
public MyTable(Button aMyButton) {
myButton = aMyButton;
}
}
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Dependency Injection is a fundamental aspect of the Spring framework, through which the Spring container “injects” objects into other objects or “dependencies”. Simply put, this allows for loose coupling of components and moves the responsibility of managing components onto the container.
The Spring-Core module is responsible for injecting dependencies through either Constructor or Setter methods. The design principle of Inversion of Control emphasizes keeping the Java classes independent of each other and the container frees them from object creation and maintenance.
We can combine constructor-based and setter-based types of injection for the same bean. The Spring documentation recommends using constructor-based injection for mandatory dependencies, and setter-based injection for optional ones.
The injection in Spring is either done via setter, field or constructor injection. Classes which are managed by Spring DI must conform to the Java bean standard. In the context of Spring classes are also referred to as beans or as spring beans.
Guice is supported on GWT using GIN. For Spring-like DI with GWT, check out GWT Toolbox or Rocket GWT.
I believe GIN is a more natural choice for GWT. Not because it's also made by Google, but because using XML for GWT configuration makes absolutely no sense. Everything gets statically compiled into JavaScript so there is no need for externalized configuration. Keep your refactoring tools happy; go for GIN.
To answer your other question, you will not find many SE frameworks that work on GWT. First and foremost, it has no support for reflection or bytecode manipulation (everything is JavaScript), which immediately rules out a lot of frameworks. Log4j, on the other hand, doesn't make sense because there is no file system accessible on the client side, but there are libraries available that do things differently.
The Spring libraries for GWT mentioned above are basically a rewrite of the Spring for GWT. They do not share any code with Spring simply because they can't. Those frameworks work by generating code ("factories") that wire up your components as if you were doing DI manually.
This is also how GIN works, it generates Java factories for your classes, and GWT compiles it into optimized JavaScript (meaning little performance overhead). GIN does use Guice behind the scenes though, to validate configuration at compile time and to inspect modules.
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