我用 jersey 开发了一个小型服务器做
HttpServer server = HttpServerFactory.create("http://localhost:9998/");
server.start();
和一个像这样的小api：
@GET
@Path("serverconnectiontest")
@Produces(MediaType.APPLICATION_JSON)
public CommunicationResponseM isDatabaseOnline()
{
CommunicationResponseM result = new CommunicationResponseM();
return result;
}
在 Eclipse 中，如果我使用 right_click->run as->java 应用程序启动服务器一切顺利，所以如果我在 Web 浏览器中键入路径，我可以看到服务器响应。
现在我想为我的服务器制作一个 jar，所以我这样做：right_click->export->runanble_jar 并且我得到了 jar 文件.. 但是如果我使用“java -jar file.jat”运行这个 jar，服务器不会回复并给我这个错误：
com.sun.jersey.spi.container.ContainerResponse write
SEVERE: A message body writer for Java class
it.unitn.se.gym.backend.models.CommunicationResponseM, and Java type class
it.unitn.se.gym.backend.models.CommunicationResponseM, and MIME media type
application/json was not found
Mar 14, 2013 6:59:10 PM com.sun.jersey.spi.container.ContainerResponse write
SEVERE: The registered message body writers compatible with the MIME media type are:
application/json ->
com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$App
com.sun.jersey.json.impl.provider.entity.JSONArrayProvider$App
com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$App
com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$App
com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$App
com.sun.jersey.core.impl.provider.entity.FormProvider
com.sun.jersey.core.impl.provider.entity.StringProvider
com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
com.sun.jersey.core.impl.provider.entity.FileProvider
com.sun.jersey.core.impl.provider.entity.InputStreamProvider
com.sun.jersey.core.impl.provider.entity.DataSourceProvider
com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
com.sun.jersey.core.impl.provider.entity.ReaderProvider
com.sun.jersey.core.impl.provider.entity.DocumentProvider
com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider
com.sun.jersey.core.impl.provider.entity.SourceProvider$SourceWriter
com.sun.jersey.server.impl.template.ViewableMessageBodyWriter
com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$General
com.sun.jersey.json.impl.provider.entity.JSONArrayProvider$General
com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$General
com.sun.jersey.json.impl.provider.entity.JSONWithPaddingProvider
com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General
com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$General
com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$General
com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy
Mar 14, 2013 6:59:10 PM com.sun.jersey.spi.container.ContainerResponse logException
SEVERE: Mapped exception to response: 500 (Internal Server Error)
javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A message body
writer for Java class it.unitn.se.gym.backend.models.CommunicationResponseM, and Java type
class it.unitn.se.gym.backend.models.CommunicationResponseM, and MIME media type
application/json was not found
at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:285)
at
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1479)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
at com.sun.jersey.server.impl.container.httpserver.HttpHandlerContainer.handle(HttpHandlerContainer.java:191)
at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:65)
at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:65)
at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:68)
at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:557)
at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:65)
at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:529)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:680)
Caused by: com.sun.jersey.api.MessageException: A message body writer for Java class
it.unitn.se.gym.backend.models.CommunicationResponseM, and Java type class
it.unitn.se.gym.backend.models.CommunicationResponseM, and MIME media type
application/json was not found
你能帮助我吗？
非常感谢！
如果我尝试