Question

我和泽西岛一起尝试Atmosphere能够向用户广播消息。但是，根据对Jersey端点的请求，日志中会出现以下内容并导致ServletException。

SEVERE: The following errors and warnings have been detected with resource and/or provider classes:
  SEVERE: Missing dependency for method public void org.apache.cxf.jaxrs.provider.JSONProvider.setMessageContext(org.apache.cxf.jaxrs.ext.MessageContext) at parameter at index 7
  SEVERE: Missing dependency for field: private org.apache.cxf.jaxrs.ext.MessageContext org.apache.cxf.jaxrs.provider.RequestDispatcherProvider.mc
  SEVERE: Missing dependency for method public void org.apache.cxf.jaxrs.provider.JAXBElementProvider.setMessageContext(org.apache.cxf.jaxrs.ext.MessageContext) at parameter at index 1
  SEVERE: Missing dependency for field: private org.apache.cxf.jaxrs.ext.MessageContext org.apache.cxf.jaxrs.provider.MultipartProvider.mc
  SEVERE: Missing dependency for method public void org.apache.cxf.jaxrs.provider.JAXBElementProvider.setMessageContext(org.apache.cxf.jaxrs.ext.MessageContext) at parameter at index 13
  SEVERE: Missing dependency for field: private org.apache.cxf.jaxrs.ext.MessageContext org.apache.cxf.jaxrs.provider.FormEncodingProvider.mc

stacktrace的一部分：

SEVERE: Allocate exception for servlet AtmosphereServlet
javax.servlet.ServletException
    at org.atmosphere.cpr.AtmosphereServlet.init(AtmosphereServlet.java:540)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:809)

我正在使用Maven并添加了以下依赖项：

<dependency>
  <groupId>org.atmosphere</groupId>
  <artifactId>atmosphere-jersey</artifactId>
  <version>0.6.3</version>
</dependency>

我错过了什么？谢谢！

Answer 1

问题显然是应用程序中存在两种JAX-RS实现。这可以通过使Jersey仅扫描包含Rest类的包来解决，因此不知道其他JAX-RS实现。

<servlet>
  <description>AtmosphereServlet</description>
  <servlet-name>AtmosphereServlet</servlet-name>
  <servlet-class>org.atmosphere.cpr.AtmosphereServlet</servlet-class>
   ...
  <init-param>
    <param-name>com.sun.jersey.config.property.packages</ param-name> 
    <param-value>mypackage.with.the.rest.classes</param-value>
  </init-param>
</servlet>

感谢Jersey邮件列表上的Paul Sandoz和Atmosphere邮件列表上的Jeanfrancois。

Answer 2

据报道，在web.xml中降级web-app描述符版本可以帮助禁用本机（Jersey）扫描：http://cxf.apache.org/docs/jax-rs-deployment.html#JAX-RSDeployment-WebLogic

<!-- From: -->
<web-app version="3.0" 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_3_0.xsd">
</web-app>
<!-- To: -->
<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">
</web-app>

缺少与Atmosphere和Jersey的依赖关系

2 个答案: