Hi,
I'm still pretty new to Guice and I feel like I'm missing something very
basic. I have an annotated object Foo that I need constructed with an
injected dependency Bar. The Bar object requires some construction on my
part that is usually handled with a Builder or Factory because of the
parameters needed for it's contractor. My simple hypothetical example might
look like the following:
public class Foo {
private Bar bar;
@Inject
public Foo( Bar bar ) { this.bar = bar; }
}
public class Bar {
public Bar( int x, int y, int z ) {
// Bar is initialized via the parameters passed to this constructor.
No default constructor provided. Normally a builder knows how to construct
Bar, but I want Guice to do it.
}
}
Now here is my Module:
public class FooModule implements Module
{
public void configure(final Binder binder)
{
binder.bind(Foo.class);
}
@Provides
public Bar provideBar() {
return new Bar( 1, 2, 3 );
}
}
The problem is that when I start up my app, I get the following error:
SEVERE: Exception sending context initialized event to listener instance of
class
org.jboss.resteasy.plugins.guice.GuiceResteasyBootstrapServletContextListener
java.lang.RuntimeException: Unable to find a public constructor for class
Foo
at
org.jboss.resteasy.plugins.server.resourcefactory.POJOResourceFactory.registered(
POJOResourceFactory.java:35)
at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(
ResourceMethodRegistry.java:120)
at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(
ResourceMethodRegistry.java:106)
at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(
ResourceMethodRegistry.java:83)
at org.jboss.resteasy.core.ResourceMethodRegistry.addPerRequestResource(
ResourceMethodRegistry.java:72)
It appears to me that it is trying to locate a default no-args constructor
and is ignoring the constructor in Foo that takes a Bar as a parameter. And
finally, it doesn't appear to now how to map that to the @Provides defined
in the module that builds the object when requested.
Am I missing something? Could this simply be a problem in the Resteasy
Guice implementation? Or is it just something basic about Guice that I'm
not understanding? All the examples I've downloaded and scanned seem to
always use very simple objects with default constructors. I know there's a
way to do this. I've tried adding @Named("Bar") to my @Provides method and
the corresponding @Inject method parameter. Still does not work.
Any help would be greatly appreciated.
Thanks,
Michael
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