我正在尝试连接到一个web服务与RESTeasy。
我使用的代码是:
WebTarget resource = client.target(URL_DISPLAY);
Builder request = resource.request(MediaType.APPLICATION_XML);
long startTime = System.currentTimeMillis();
ClientResponse response = (ClientResponse)request.post(Entity.xml(text));
当我在eclipse中运行这个程序时,它就开始工作了。
当我生成一个可运行的jar,甚至从控制台中运行java时,它都不起作用。堆栈跟踪如下:
javax.ws.rs.ProcessingException: Unable to invoke request
at org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.invoke(ApacheHttpClient4Engine.java:287)
at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.invoke(ClientInvocation.java:407)
at org.jboss.resteasy.client.jaxrs.internal.ClientInvocationBuilder.post(ClientInvocationBuilder.java:195)
at webservices.WebServicesTest.requestDisplay(WebServicesTest.java:144)
at webservices.WebServicesTest.main(WebServicesTest.java:328)
Caused by: javax.ws.rs.ProcessingException: could not find writer for content-type application/xml type: webservices.DisplayText
at org.jboss.resteasy.core.interception.ClientWriterInterceptorContext.throwWriterNotFoundException(ClientWriterInterceptorContext.java:40)
at org.jboss.resteasy.core.interception.AbstractWriterInterceptorContext.getWriter(AbstractWriterInterceptorContext.java:138)
at org.jboss.resteasy.core.interception.AbstractWriterInterceptorContext.proceed(AbstractWriterInterceptorContext.java:117)
at org.jboss.resteasy.plugins.interceptors.encoding.GZIPEncodingInterceptor.aroundWriteTo(GZIPEncodingInterceptor.java:100)
at org.jboss.resteasy.core.interception.AbstractWriterInterceptorContext.proceed(AbstractWriterInterceptorContext.java:122)
at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.writeRequestBody(ClientInvocation.java:341)
at org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.writeRequestBodyToOutputStream(ApacheHttpClient4Engine.java:558)
at org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.buildEntity(ApacheHttpClient4Engine.java:524)
at org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.loadHttpMethod(ApacheHttpClient4Engine.java:423)
at org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.invoke(ApacheHttpClient4Engine.java:281)
... 4 more
DisplayText类定义如下:
@XmlRootElement
public class DisplayText implements Serializable
我在我的pom中添加了以下包:
- resteasy-client
- resteasy-jaxrs
- resteasy-jaxb-provider(版本3.0.8.Final)
- com.sun.xml.bind
它们的作用域都在运行时。
我觉得奇怪的是,它在日食下工作。可能是一些Jaxb配置?或者上下文设置。我也试过
RegisterBuiltin.register(ResteasyProviderFactory.getInstance());
我通过使用maven shade构建它来解决这个问题。
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>com.google.MainClass</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
这里最重要的一行是:
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
shade插件配置需要服务转换器,它合并了服务发现机制使用的META-INF/services文件。