Question

我正在使用Rest / Jersey和Tomcat 7进行一个简单的Restful Web服务。如果我的所有Path包含一个参数，那么工作正常。如果我包含一个使用多个参数的参数，当我尝试点击我的资源类支持的任何资源路径时，我会遇到“找不到注入源”错误 - 即使是之前正在工作的那些资源路径。如果我注释掉那段特定代码，那么我的所有其他路径都会按预期工作。但是，如果我取消注释掉那段代码，我就无法使用任何一条路径。

以下是我的代码片段：

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

// get all the information about a specific item
@GET
@Path("/{id}")
@Produces(MediaType.APPLICATION_JSON)
public String getItem(@PathParam("id") String itemId)
{
    String answer = "{";
    answer += "\"itemid\":\"" + itemId + "\",";
    answer += "\"type\":0,";
    answer += "\"sector\":322948,";
    answer += "\"created\":53249098220";
    answer += "}";

    return answer;
}

// if I comment out this method, all is fine; 
// if I leave it in, error is thrown when I make any restful call
// query to see if there is a new item for user
@Path("/loc/{userid}/{xloc}/{yloc}")
@Produces(MediaType.APPLICATION_JSON)
public String getNewitem(@PathParam("userid") String userId,
    @PathParam("xloc") Number xLoc,
    @PathParam("yloc") Number yLoc)
{
    String answer = "{\"itemid\":\"abcdefgh\"}";
    return answer;
}

这是错误跟踪：

javax.servlet.ServletException: Servlet.init() for servlet Jersey REST Service threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Unknown Source)
root cause

org.glassfish.jersey.server.model.ModelValidationException: Validation of the application resource model has failed during application initialization.

[[FATAL] No injection source found for a parameter of type public java.lang.String com.drunkware.geobijous.resources.GBBijouResource.getNewBijou(java.lang.String,java.lang.Number,java.lang.Number) at index 1.; source='ResourceMethod{httpMethod=GET, consumedTypes=[], producedTypes=[application/json], suspended=false, suspendTimeout=0, suspendTimeoutUnit=MILLISECONDS, invocable=Invocable{handler=ClassBasedMethodHandler{handlerClass=class com.drunkware.geobijous.resources.GBBijouResource, handlerConstructors=[org.glassfish.jersey.server.model.HandlerConstructor@757bdd3c]}, definitionMethod=public java.lang.String com.drunkware.geobijous.resources.GBBijouResource.getNewBijou(java.lang.String,java.lang.Number,java.lang.Number), parameters=[Parameter [type=class java.lang.String, source=userid, defaultValue=null], Parameter [type=class java.lang.Number, source=latitude, defaultValue=null], Parameter [type=class java.lang.Number, source=longitude, defaultValue=null]], responseType=class java.lang.String}, nameBindings=[]}']
        org.glassfish.jersey.server.ApplicationHandler.initialize(ApplicationHandler.java:467)
        org.glassfish.jersey.server.ApplicationHandler.access$500(ApplicationHandler.java:163)
        org.glassfish.jersey.server.ApplicationHandler$3.run(ApplicationHandler.java:323)
        org.glassfish.jersey.internal.Errors$2.call(Errors.java:289)
        org.glassfish.jersey.internal.Errors$2.call(Errors.java:286)
        org.glassfish.jersey.internal.Errors.process(Errors.java:315)
        org.glassfish.jersey.internal.Errors.process(Errors.java:297)
        org.glassfish.jersey.internal.Errors.processWithException(Errors.java:286)
        org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:320)
        org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:285)
        org.glassfish.jersey.servlet.WebComponent.<init>(WebComponent.java:311)
        org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:170)
        org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:358)
        javax.servlet.GenericServlet.init(GenericServlet.java:158)
        org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
        org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
        org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
        java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        java.lang.Thread.run(Unknown Source)

有什么建议可以解决这个问题吗？我正在使用球衣2.12。这是一个已知的错误吗？

Answer 1

您收到的注射错误是由Number参数引起的。由于@PathParam实现不支持像Number这样的复杂对象。您可以通过以下代码轻松解决此问题（也添加@GET）

@GET
@Path("loc/{userid}/{xloc}/{yloc}")
public String getNewitem(@PathParam("userid") String userId,
    @PathParam("xloc") int xLoc,
    @PathParam("yloc") int yLoc)
{
    String answer = "{\"itemid\":\"abcdefgh\"}";
    return answer;
}

有许多方法可以处理复杂对象，以防您需要比int提供的更多信息。但是你必须改变接收它们的方式，因为@PathParam非常简单。有关复杂用法的更多详细信息，请查看Jackson以帮助您进行对象/ json转换。你可能会有这样的事情：

@POST
@Path("loc/{userid}")
public String createNewitem(@PathParam("userid") String userId, MyLocalization aLoc)
{
    String answer = "{\"itemid\":\"abcdefgh\"}";
    return answer;
}

类MyLocalization是一个pojo，您将创建由jackson libs跟随dependency处理：

  <dependency>
    <groupId>com.fasterxml.jackson.jaxrs</groupId>
    <artifactId>jackson-jaxrs-json-provider</artifactId>
    <version>2.2.3</version>
  </dependency>

使用Jersey在Restful Resource中使用多个@PathParams时没有发现注入源错误

1 个答案: