RESTEasy模擬與異常映射器與上下文

Question

RESTEasy模擬框架可正常工作，無異常映射器 - 接收到請求並返回預期內容的實體。

註冊異常映射程序並強制執行異常後，當RESTEasy內部調用ResteasyProviderFactory.getContextData（type）時會調用失敗，這會返回null，從而導致意外的錯誤消息：「無法找到類型爲javax.servlet的上下文數據。 http.HttpServletRequest」。

找不到RESTEasy mock加上異常映射程序的任何地方的任何示例，並且找不到有關該錯誤的任何有用內容。

Client類：

package com.foo; 

import javax.xml.bind.annotation.XmlAccessType; 
import javax.xml.bind.annotation.XmlAccessorType; 
import javax.xml.bind.annotation.XmlRootElement; 
import javax.xml.bind.annotation.XmlType; 

@XmlAccessorType(XmlAccessType.FIELD) 
@XmlType(name = "foo-type", propOrder = { 
    "name" 
}) 
@XmlRootElement(name = "foo") 
public class Foo { 

    protected String name; 

    public String getName() { 
     return name; 
    } 

    public void setName(String value) { 
     this.name = value; 
    } 
} 

對象工廠：

package com.foo; 

import javax.xml.bind.annotation.XmlRegistry; 

@XmlRegistry 
public class ObjectFactory { 

    public ObjectFactory() { 
    } 

    public Foo createFoo() { 
     return new Foo(); 
    } 
} 

驗證異常：

package com.foo; 

public class ValidationException extends RuntimeException { 

    private static final long serialVersionUID = -8100360206713223313L; 

    public ValidationException(String message) { 
     super(message); 
    } 

    public ValidationException(Exception innerException) { 
     super(innerException); 
    } 

    public ValidationException(String message, Exception innerException) { 
     super(message, innerException); 
    } 
} 

服務端點：

package com.foo; 

import javax.ws.rs.GET; 
import javax.ws.rs.Path; 
import javax.ws.rs.Produces; 

@Path("/rest/v1") 
public class FooService { 

    @GET 
    @Path("/foo") 
    @Produces("application/xml") 
    public Foo alwaysBlowUp() throws ValidationException { 
     if (System.currentTimeMillis() > 0) { 
      throw new ValidationException("FOO"); 
     } 
     return null; 
    } 
} 

異常映射：

package com.foo; 

import javax.servlet.http.HttpServletRequest; 
import javax.ws.rs.core.Context; 
import javax.ws.rs.core.HttpHeaders; 
import javax.ws.rs.core.MediaType; 
import javax.ws.rs.core.Response; 
import javax.ws.rs.core.Response.ResponseBuilder; 
import javax.ws.rs.core.Response.Status; 
import javax.ws.rs.ext.ExceptionMapper; 
import javax.ws.rs.ext.Provider; 

@Provider 
public class FooExceptionMapper implements ExceptionMapper<ValidationException> { 

    @Context 
    private static HttpServletRequest request; 
    @Context 
    private static HttpHeaders headers; 

    @Override 
    public Response toResponse(ValidationException exception) { 
     MediaType mediaType = null; 

/* 
Set breakpoint on line below. 
Step over line and you get the exception in the logs. 
Step into the line and the problem is in ResteasyProviderFactory: 

public static <T> T getContextData(Class<T> type) 
{ 
    return (T) getContextDataMap().get(type); <<< type == javax.servlet.http.HttpServletRequest 
} 

The type is not in the map, so it returns null. 

The null results in this error in ContextParameterInjector: 

private class GenericDelegatingProxy implements InvocationHandler 
{ 
    public Object invoke(Object o, Method method, Object[] objects) throws Throwable 
    { 
     try 
     { 
      Object delegate = ResteasyProviderFactory.getContextData(type); 
      if (delegate == null) 
       throw new LoggableFailure("Unable to find contextual data of type: " + type.getName()); <<< ERROR IN LOGS 
*/ 

     String acceptHeader = request.getHeader("accept"); 

     if (MediaType.APPLICATION_XML.equals(acceptHeader)) { 
      mediaType = MediaType.APPLICATION_XML_TYPE; 
     } else if (MediaType.APPLICATION_JSON.equals(acceptHeader)) { 
      mediaType = MediaType.APPLICATION_JSON_TYPE; 
     } else { 
      mediaType = headers.getMediaType(); 

      if (mediaType == null) { 
       mediaType = MediaType.APPLICATION_XML_TYPE; 
      } 
     } 

     ResponseBuilder builder = Response.status(Status.BAD_REQUEST); 
     builder.type(mediaType); 
     return builder.build(); 
    } 
} 

測試：

package com.foo; 

import java.net.URISyntaxException; 

import org.jboss.resteasy.core.Dispatcher; 
import org.jboss.resteasy.mock.MockDispatcherFactory; 
import org.jboss.resteasy.mock.MockHttpRequest; 
import org.jboss.resteasy.mock.MockHttpResponse; 
import org.jboss.resteasy.plugins.server.resourcefactory.POJOResourceFactory; 

public final class TestFooExceptionMapper { 

    public static void main(String[] args) throws URISyntaxException { 
     Dispatcher dispatcher = MockDispatcherFactory.createDispatcher(); 
     dispatcher.getRegistry().addResourceFactory(new POJOResourceFactory(FooService.class)); 
     dispatcher.getProviderFactory().addExceptionMapper(FooExceptionMapper.class); 

     MockHttpRequest request = MockHttpRequest.get("/rest/v1/foo"); 
     MockHttpResponse response = new MockHttpResponse(); 
     dispatcher.invoke(request, response); 
    } 
} 

錯誤：

Aug 26, 2012 10:44:26 PM org.jboss.resteasy.core.SynchronousDispatcher 
SEVERE: Failed executing GET /rest/v1/foo 
org.jboss.resteasy.spi.LoggableFailure: Unable to find contextual data of type: javax.servlet.http.HttpServletRequest 
    at org.jboss.resteasy.core.ContextParameterInjector$GenericDelegatingProxy.invoke(ContextParameterInjector.java:56) 
    at $Proxy18.getHeader(Unknown Source) 
    at com.foo.FooExceptionMapper.toResponse(FooExceptionMapper.java:51) 
    at com.foo.FooExceptionMapper.toResponse(FooExceptionMapper.java:1) 
    at org.jboss.resteasy.core.SynchronousDispatcher.executeExceptionMapper(SynchronousDispatcher.java:330) 
    at org.jboss.resteasy.core.SynchronousDispatcher.unwrapException(SynchronousDispatcher.java:359) 
    at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:348) 
    at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:220) 
    at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:196) 
    at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:551) 
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:513) 
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:125) 
    at com.foo.TestFooExceptionMapper.main(TestFooExceptionMapper.java:20) 

Answer 1

的問題是， '模擬框架' 不提供HttpServletRequest上下文。它與ExceptionMapper沒有直接關係。

Resteasy注入@Context字段基於ResteasyProviderFactory.getContextDataMap()中的數據。當這個地圖沒有包含HttpServletRequest一個實例，它炸燬蒙山錯誤「無法找到類型的上下文數據......」

我已經把一個模擬HttpServletRequest到RestEasy的情況下解決此工作：

Dispatcher dispatcher = MockDispatcherFactory.createDispatcher(); 
dispatcher.getRegistry().addSingletonResource(new Service()); 

ResteasyProviderFactory 
     .getContextDataMap() 
     .put(HttpServletRequest.class, new MockHttpServletRequest()); 

MockHttpResponse response = new MockHttpResponse(); 

dispatcher.invoke(
    MockHttpRequest.get("/"), 
    response 
);