[英]Guice - Jersey - Servlet binding
I recently switched to two phase injection and this has created an error in my servlet binding. 我最近切换到两阶段注入,这在我的servlet绑定中创建了一个错误。 I am currently toggling between two error modes and not sure which direction is best to pursue. 我目前正在两种错误模式之间切换,不确定哪种方向最好。
The first error I encountered was: 我遇到的第一个错误是:
com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes. com.sun.jersey.api.container.ContainerException:ResourceConfig实例不包含任何根资源类。
My servlet module looked like this: 我的servlet模块看起来像这样:
public class MyServletModule extends JerseyServletModule {
@Override
protected void configureServlets() {
bind(MyServlet.class).asEagerSingleton();
serve("/*").with(GuiceContainer.class);
}
}
I was able to remove this error by explicitly providing the com.sun.jersey.config.property.packages parameter. 我能够通过显式提供com.sun.jersey.config.property.packages参数来删除此错误。
public class MyServletModule extends JerseyServletModule {
@Override
protected void configureServlets() {
bind(MyServlet.class).asEagerSingleton();
Map<String,String> parameters = new HashMap<String, String>();
parameters.put(PackagesResourceConfig.PROPERTY_PACKAGES, MyServlet.class.getPackage().getName());
serve("/*").with(GuiceContainer.class, parameters);
}
}
But when I do this, Guice attempts a Just in Time binding which does not respect the @Inject on my servlet constructor. 但是当我这样做时,Guice尝试了一个Just in Time绑定,它不尊重我的servlet构造函数上的@Inject。
com.google.inject.ConfigurationException: Guice configuration errors: com.google.inject.ConfigurationException:Guice配置错误:
1) Unable to create binding for MyServlet. 1)无法为MyServlet创建绑定。 It was already configured on one or more child injectors or private modules bound at MyServletModule.configureServlets(MyServletModule.java:44) If it was in a PrivateModule, did you forget to expose the binding? 它已经在MyServletModule.configureServlets绑定的一个或多个子注入器或私有模块上配置(MyServletModule.java:44)如果它在PrivateModule中,您是否忘记公开绑定? while locating MyServlet 在找到MyServlet时
1 error at com.google.inject.internal.InjectorImpl.getBinding(InjectorImpl.java:150) com.google.inject.internal.InjectorImpl.getBinding上的1个错误(InjectorImpl.java:150)
My servlet has an @Inject constructor who's arguments cannot be bound just in time. 我的servlet有一个@Inject构造函数,它的参数不能及时绑定。 After debugging into InjectorImpl, I believe this is the reason that things fail when I use PROPERTY_PACKAGES. 在调试InjectorImpl后,我相信这就是我使用PROPERTY_PACKAGES时失败的原因。
I'm just not sure if using PROPERTY_PACKAGES is correct and I need to fix some bindings? 我只是不确定使用PROPERTY_PACKAGES是否正确,我需要修复一些绑定? Or if that is the wrong direction and I need to fix the original ResourceConfig error in a different way. 或者,如果这是错误的方向,我需要以不同的方式修复原始的ResourceConfig错误。
Help or a push in the right direction is appreciated. 感谢帮助或推动正确的方向。
I was able to bind Jersey resources to Guice without using the bind-parameters (without explicitly providing the com.sun.jersey.config.property.packages parameter), by binding resources separately 我能够将Jersey资源绑定到Guice而不使用bind-parameters(没有显式提供com.sun.jersey.config.property.packages参数),通过单独绑定资源
public class BindJerseyResources extends ServletModule {
@Override
protected void configureServlets() {
// excplictly bind GuiceContainer before binding Jersey resources
// otherwise resource won't be available for GuiceContainer
// when using two-phased injection
bind(GuiceContainer.class);
// bind Jersey resources
PackagesResourceConfig resourceConfig = new PackagesResourceConfig("jersey.resources.package");
for (Class<?> resource : resourceConfig.getClasses()) {
bind(resource);
}
// Serve resources with Jerseys GuiceContainer
serve("/*").with(GuiceContainer.class);
}
}
The resources are like following 资源如下
@Path("/")
@RequestScoped
public class Resource {
private Storage storage;
@Inject
public Resource(Storage storage) {
this.storage = storage;
}
@GET
@Path("get/{name}")
@Produces(MediaType.TEXT_PLAIN)
public String getGuid(@PathParam("name") String name) {
return storage.get(name);
}
}
Maybe this helps you to avoid the latter problematic binding. 也许这可以帮助您避免后一个有问题的绑定。
Updated the answer to work with two-phased injection. 更新了使用两阶段注射的答案。
Java Part Java部分
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Singleton;
import com.google.inject.persist.jpa.JpaPersistModule;
import com.google.inject.servlet.GuiceServletContextListener;
import com.sun.jersey.guice.JerseyServletModule;
import com.sun.jersey.guice.spi.container.servlet.GuiceContainer;
import com.sun.jersey.spi.container.servlet.ServletContainer;
import com.thjug.apipublic.Echo;
public class ServletContextListener extends GuiceServletContextListener {
@Override
protected Injector getInjector() {
final Injector injector = Guice.createInjector(new JerseyServletModule() {
@Override
protected void configureServlets() {
bind(Echo.class);
bind(ServletContainer.class).in(Singleton.class);
serve("/*").with(GuiceContainer.class);
}
}, new JpaPersistModule("dbUnit"), new LoggingModule());
injector.getInstance(JPAInitializer.class);
return injector;
}
}
web.xml web.xml中
<distributable />
<display-name>API</display-name>
<filter>
<filter-name>guiceFilter</filter-name>
<filter-class>com.google.inject.servlet.GuiceFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>guiceFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<description>Guice Initiate</description>
<listener-class>com.thjug.base.ServletContextListener</listener-class>
</listener>
Below is my keynote about How to make REST with Guice http://www.slideshare.net/nuboat/lightweight-javaee 以下是关于如何使用Guice进行REST的主题演讲http://www.slideshare.net/nuboat/lightweight-javaee
这是一篇关于如何进行绑定的文章(包括完整的源代码): implementation-distributed-counter
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