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I am using ejb 3 and trying to @Inject HttpServletRequest, but while deploying I occur exception.
Code:
@Inject private HttpServletRequest httpRequest;
Exception:
org.jboss.weld.exceptions.DeploymentException: WELD-001408 Unsatisfied dependencies for type [HttpServletRequest] with qualifiers [@Default] at injection point [[field] @Inject private com.kmware.ttk.highway.beans.session.UserSessionBean.httpRequest]
What could I do with that?
601
Interface HttpServletRequest. Extends the ServletRequest interface to provide request information for HTTP servlets. The servlet container creates an HttpServletRequest object and passes it as an argument to the servlet's service methods ( doGet , doPost , etc). String identifier for Basic authentication.
ServletRequest provides basic setter and getter methods for requesting a Servlet, but it doesn't specify how to communicate. HttpServletRequest extends the Interface with getters for HTTP-communication (which is of course the most common way for communicating since Servlets mostly generate HTML).
In a typical Servlet container implementation if an HTTP request comes in, an HttpServletRequest is created right when the HTTP input data of the request is parsed by the Servlet container.
In any Java servlet container, such as Apache Tomcat, HttpServlet is a singleton class (see MSC07-J. Prevent multiple instantiations of singleton objects for information related to singleton classes). Therefore, there can be only one instance of member variables, even if they are not declared static.
The lifecycle of HttpServletRequest is managed by the EJB/web container, not the CDI container. Attempting to inject it leads to issues because there are typically many implementations of the interface,and your CDI container does not have enough information to make a decision on which implementation to inject. Even if you successfully injected an instance of it, it would not be the same instance as being managed by the EJB container.
To acquire a properly managed instance of the request, do this instead:
@Context
private HttpServletRequest httpRequest;
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