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java - RESTEasy Mock 对比异常映射器对比上下文

转载 作者:塔克拉玛干 更新时间:2023-11-03 04:47:34 24 4
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RESTEasy 模拟框架工作正常,没有映射器异常——收到请求并返回具有预期内容的实体。

注册异常映射器并强制异常后,RESTEasy 内部调用 ResteasyProviderFactory.getContextData(type) 时调用失败,返回 null,导致意外错误消息:“无法找到类型的上下文数据:javax.servlet.http .HttpServletRequest”。

在任何地方都找不到任何关于 RESTEasy mock 和异常映射器的在线示例,也找不到任何关于该错误的有用信息。

客户端类:

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;
}
}

对象工厂:

package com.foo;

import javax.xml.bind.annotation.XmlRegistry;

@XmlRegistry
public class ObjectFactory {

public ObjectFactory() {
}

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

验证异常:

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);
}
}

服务端点:

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;
}
}

异常映射器:

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();
}
}

测试:

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);
}
}

错误:

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)

最佳答案

问题是“模拟框架”不向上下文提供 HttpServletRequest。它与 ExceptionMapper 没有直接关系。

Resteasy 根据 ResteasyProviderFactory.getContextDataMap() 中存在的数据注入(inject) @Context 字段。当此映射不包含 HttpServletRequest 的实例时,它会爆炸并出现错误“无法找到类型...的上下文数据”

我通过将模拟 HttpServletRequest 放入 resteasy 上下文来解决这个问题:

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
);

关于java - RESTEasy Mock 对比异常映射器对比上下文,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12136780/

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