尝试使用 jersey 和 jaxb 时出现异常

Question

以下代码：

@POST
@Path("/previous-status/{current}")
@Consumes(MediaType.APPLICATION_XML)
@Produces(MediaType.TEXT_PLAIN)
public String getPreviousStepStatus(@PathParam("current") JAXBElement<WorkflowStep> step) {
    WorkflowStep wfStep = step.getValue();
    return DBAccessor.getPrevStepStatus(wfStep);
}

产生以下异常：

javax.servlet.ServletException: Servlet.init() for servlet Jersey Rest Service threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    java.lang.Thread.run(Thread.java:662)

root cause

com.sun.jersey.spi.inject.Errors$ErrorMessagesException
    com.sun.jersey.spi.inject.Errors.processErrorMessages(Errors.java:170)
    com.sun.jersey.spi.inject.Errors.postProcess(Errors.java:136)
    com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:199)
    com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:771)
    com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:766)
    com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
    com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
    com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609)
    com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
    javax.servlet.GenericServlet.init(GenericServlet.java:160)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    java.lang.Thread.run(Thread.java:662)

如果对其进行注释，我不会得到异常。 Web 应用程序中当前使用的库是：

asm-3.1.jar
jersey-core-1.11.jar
jersey-server-1.11.jar
jsr311-api-1.1.1.jar
jersey-servlet-1.11.jar
activation.jar (part of jaxb distribution)
jaxb-api.jar
jaxb-impl.jar
stax-api-1.0.1.jar
woodstox-core-asl-4.1.2.jar

我将最后 5 个库包含在列表中的原因是来自 开发者作品

此外，从 tomcat 启动日志中我看到以下内容：

SEVERE: The following errors and warnings have been detected with resource and/or provider classes:
  SEVERE: Missing dependency for method public java.lang.String restful.SilverLine.getPreviousStepStatus(javax.xml.bind.JAXBElement) at parameter at index 0
  SEVERE: Method, public java.lang.String restful.SilverLine.getPreviousStepStatus(javax.xml.bind.JAXBElement), annotated with POST of resource, class restful.SilverLine, is not recognized as valid resource method.

有任何想法将不胜感激吗？

Answer 1

PathParameter 和实体是不同的，请尝试以下操作：

@POST
@Path("/previous-status/{order}")
@Consumes(MediaType.APPLICATION_XML)
@Produces(MediaType.TEXT_PLAIN)
public String getPreviousStepStatus(@PathParam("order") int order, JAXBElement<WorkflowStep> step) {

    ...

    WorkflowStep wfStep = step.getValue();
    return DBAccessor.getPrevStepStatus(wfStep);
}

在这种情况下，您可以执行类似 POST http://host/previous 的请求-status/10 并将您想要的任何内容放入实体中。

您在路径参数（URL 的一部分）中有 xml，但无法使用。您的请求类似于 POST http://主机/先前状态/bar> ，这..不是好主意并且不受支持。

您应该查看 Jersey 用户指南： http://jersey.java.net/nonav/ Documentation/latest/ 中详细介绍了路径参数注入、访问实体和使用 XML 等主题。