Java 找不到restful Web服务公共构造函数

我试图使用客户端web应用程序（来自JSF MB的简单客户端请求）调用restful web服务。我需要为webservice创建一个接口，然后调用其中的方法。但若我在接口处使用@Path，它会给出一个错误——Jboss部署期间找不到公共构造函数。但如果我在实现类中给出@Path。它很好地调用了服务，并且工作正常。我需要在Rest客户端和RESTfulWebService impl类之间有一个Java接口。有人能帮忙吗？我们可以使用Rest接口或其他什么吗

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

客户端：

ClientRequest request = new ClientRequest("localhost:8080/RESTfulExample/json/...../"); 
ClientResponse<String> response = request.get(String.class);

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

IMPL：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

---

我猜您的错误在于您给RestEasy提供了一个接口，而框架正试图通过反射创建它的实例。那样的事情永远不会奏效。您应该只将实现类指定为参数

resteasy.resources

的值，而不是接口。如果您想更具动态性，请尝试OSGi和REST的组合。我自己并没有在博客上尝试过这个例子，但你可以看看

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

更新

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

既然您也想从第三方类使用您的服务，为什么不用REST webservice包装另一个接口，这样包装好的接口就可以在第三方类中使用呢。然后，webservice仅用于将请求委托给此接口的特定实现。您可以通过依赖注入框架（如Spring、Google Juice或其他）注入实现。我的意思是：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

将接口作为实现的抽象：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

interface IExecutionService {
   void executeStuff();
}

然后您的休息服务：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

@Path("/OrderManagementService")
class ExectionServiceDelegator {

   private IExecutionService wrappedServiceInterface;

   /**
    * play around with some DI frameworks for injecting your implementation
    */
   public void setIExecutionService(IExecutionService service) {
      wrappedServiceInterface = service;    
   }

   @GET
   @Path("/GetListOfOrders") 
   public void doingSomething() {
      service.executeStuff();
   }
}

---

您也可以在第三方接口中结合使用接口

IExecutionService

，以及特定的DI框架。希望你能明白我想用上面的代码做什么

以上问题有一个简单的答案。在web.xml中，我只需配置IMPL类而不是interface，并在interface处继续设置@Path

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.seagate.implementations.OrderManagementServiceImpl
    </param-value>
</context-param>

resteasy.resources
com.segate.implements.OrderManagementServiceImpl

---

它成功了：）…

发布您的代码。如果你正在使用一个接口，那么所有的JAX-RS注释都应该在上面定义。请用格式良好的代码更新你的帖子。你的接口代码是不可编译的。我们还需要您的实现代码。如果我在Impl class.中给出@Path注释，并在web.xml中配置路径。。。一切照旧。。它工作正常..我在接口代码中看不到任何编译错误。。请让我知道如果有任何。。。正如我现在说的，在impl课堂上没有什么大不了的。。。我只关心调用接口。。。在IMPL中，我只是在控制台中打印一条消息。。我也有更新的impl代码…谢谢christian…所以没有OSGI，我们无法使用resteasy界面？？？。。这真是令人伤心。通常，对于基于SOAP的Web服务，我们使用一个接口来调用服务。即使在OSGi中，您也通常不使用直接接口来抽象REST服务。在我看来，这没有多大意义。为什么？因为在从客户端调用资源时，实际上不使用特定的实现。你只需要调用一个URL，没有类。只有您的应用程序服务器负责将这些URL映射到资源（在您的示例中是您在类中指定的REST资源路径）。这意味着URL在某种程度上是您的“接口”。只需为类定义相同的路径，就可以轻松地更改实现。。。。。。只需更改resteasy.resources参数，即可将URL路径映射到新类。希望现在更清楚，您不必过于依赖Java接口：）如您所见，提供的博客中的示例也不使用接口。；）实际上，我的Web服务也会被一些第三方接口使用。。我只是不想向他们公开我的实现。这就是我渴望在两者之间建立接口的原因。是的，克里斯！！！如果我直接为impl类设置了路径，我就能够调用服务……我只是希望Java反射没有玩过这样一种破坏性的游戏来直接调用接口。。我仍然很难过：（为什么不将REST用作底层实现的桥接器/适配器。我将更新我的答案以澄清我的意思。这就是我在回答中对您说的！第一部分

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
    <param-name>resteasy.resources</param-name>
    <param-value>
        com.nee.interfaces.OrderManagementServiceInterface
    </param-value>
</context-param>

<!-- this has to match with resteasy-servlet url-pattern -->

<context-param>
    <param-name>resteasy.servlet.mapping.prefix</param-name>
    <param-value>/rest</param-value>
</context-param>

<!-- to return data according to extension -->

<context-param>
    <param-name>resteasy.media.type.mappings</param-name>
    <param-value>json : application/json, xml : application/xml</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
    </listener-class>
</listener>

<servlet>
    <servlet-name>resteasy-servlet</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>resteasy-servlet</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>