java 未找到提供程序类：运行 Jersey REST 服务时
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No provider classes found: when running Jersey REST service
提问by Sajeetharan
I am very new to Java, and i have followed a tutorial to create an JAX-RS service, everything i did was according to the tutorial, but cannot get it to work. I have attached the screen shot and logs.
我对 Java 非常陌生，我按照教程创建了 JAX-RS 服务，我所做的一切都是根据教程进行的，但无法使其正常工作。我附上了屏幕截图和日志。
WEB.XML
网页.XML
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>com.duo.test</display-name>
<servlet>
<servlet-name>Jersey Rest Service</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.duo.test</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey Rest Service</servlet-name>
<url-pattern>/api/*</url-pattern>
</servlet-mapping>
</web-app>
MY class:
我的课：
package com.duo.test.status;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
@Path("/v1/status/*")
public class V1_status {
@GET
@Produces(MediaType.TEXT_HTML)
public String returnTitle()
{
return "<p> Java Web Serbice</p>";
}
}
Logs:
日志：
Sep 23, 2014 12:22:56 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre7\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\OpenCL SDK.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK.0\bin\x64;C:\Program Files\Microsoft\Web Platform Installer\;D:\ndk;C:\ant\;C:\Program Files\Java\jdk1.7.0_07\bin;D:\Softwares\Ecclipse\Ecclipse\sdk\build-tools.1.0;C:\Program Files (x86)\Windows Kits.0\Windows Performance Toolkit\;C:\Program Files (x86)\Windows Kits.1\Windows Performance Toolkit\;C:\Program Files (x86)\MySQL\MySQL Server 5.6\bin;C:\Program Files (x86)\GtkSharp.12\bin;C:\Takipi\lib;C:\Takipi\lib32;C:\Program Files (x86)\Microsoft SDKs\TypeScript.0\;C:\Program Files (x86)\nodejs\;JAVA_HOME%\bin;C:\apache-ant-1.9.4\bin;C:\adt-bundle\sdk\platform-tools;C:\adt-bundle\sdk\tools;;C:\Program Files (x86)\Java\jdk1.6.0_39\bin;C:\Users\sajeetharan.DUOSL.000\AppData\Local\Android\android-sdk\tools;C:\Users\sajeetharan.DUOSL.000\AppData\Local\Android\android-sdk\platform-tools;C:\Program Files\Microsoft SQL Server0\Tools\Binn\;;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\OpenCL SDK.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK.0\bin\x64;C:\Program Files\Microsoft\Web Platform Installer\;D:\ndk;C:\ant\;C:\Program Files\Java\jdk1.7.0_07\bin;D:\Softwares\Ecclipse\Ecclipse\sdk\build-tools.1.0;C:\Program Files (x86)\Windows Kits.0\Windows Performance Toolkit\;C:\Program Files (x86)\Windows Kits.1\Windows Performance Toolkit\;C:\Program Files (x86)\MySQL\MySQL Server 5.6\bin;C:\Program Files (x86)\GtkSharp.12\bin;C:\Takipi\lib;C:\Takipi\lib32;C:\Program Files (x86)\Microsoft SDKs\TypeScript.0\;C:\Program Files (x86)\nodejs\;JAVA_HOME%\bin;C:\apache-ant-1.9.4\bin;C:\adt-bundle\sdk\platform-tools;C:\adt-bundle\sdk\tools;;C:\Program Files (x86)\Java\jdk1.6.0_39\bin;C:\Users\sajeetharan.DUOSL.000\AppData\Local\Android\android-sdk\tools;C:\Users\sajeetharan.DUOSL.000\AppData\Local\Android\android-sdk\platform-tools;C:\Program Files\Microsoft SQL Server0\Tools\Binn\tools;C:\apache-ant-1.9.4\bin;C:\adt-bundle\sdk\tools;C:\adt-bundle\sdk\platform-tools;c:\users\sajeetharan.DUOSL.000\AppData\Roaming\npm\;.
Sep 23, 2014 12:22:57 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:com.duo.test' did not find a matching property.
Sep 23, 2014 12:22:57 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-nio-8080"]
Sep 23, 2014 12:22:57 PM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
Sep 23, 2014 12:22:57 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-nio-8009"]
Sep 23, 2014 12:22:57 PM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
Sep 23, 2014 12:22:57 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 2349 ms
Sep 23, 2014 12:22:58 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Sep 23, 2014 12:22:58 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/8.0.12
Sep 23, 2014 12:23:01 PM com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Scanning for root resource and provider classes in the packages:
com.duo.test
Sep 23, 2014 12:23:01 PM com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Root resource classes found:
class com.duo.test.status.V1_status
Sep 23, 2014 12:23:01 PM com.sun.jersey.api.core.ScanningResourceConfig init
INFO: No provider classes found.
Sep 23, 2014 12:23:01 PM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.17 01/17/2013 03:31 PM'
[2014-09-23 12:23:03 TAKIPI] User code detected.
Sep 23, 2014 12:23:04 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-8080"]
Sep 23, 2014 12:23:04 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-nio-8009"]
Sep 23, 2014 12:23:04 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 6653 ms
OUTPUT:
输出：
采纳答案by Amit Kaneria
One of the issue, I found with error
问题之一，我发现错误
com.sun.jersey.api.core.ScanningResourceConfig init INFO: No provider classes found.
is using Lambda expressions(Java 8) in Rest service class. Jersey fails to scan the annotations, if Lambdas are used in the package specified in web.xml file below:
在 Rest 服务类中使用 Lambda 表达式（Java 8）。如果在以下 web.xml 文件中指定的包中使用了 Lambda，Jersey 将无法扫描注释：
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.duo.test</param-value>
</init-param>
Solution for this problem is to remove Lambda in any class in the package specified.
此问题的解决方案是删除指定包中任何类中的 Lambda。
NOTE:This may be only a problem with Jersey 1.x, I have not tried using Jersey 2.x yet. Removing Lambda has helped me work around the issue temporarily.
注意：这可能只是 Jersey 1.x 的问题，我还没有尝试使用 Jersey 2.x。删除 Lambda 帮助我暂时解决了这个问题。
回答by Abimaran Kugathasan
URL Mapping was wrong, it should be
URL Mapping 错了，应该是
<servlet-mapping>
<servlet-name>Jersey Rest Service</servlet-name>
<url-pattern>/v1/*</url-pattern>
</servlet-mapping>
And acording to your configurations, API URL should be http://localhost:8080/v1/status/
根据您的配置，API URL 应该是 http://localhost:8080/v1/status/
Or
或者
Change your URI Mapping in in Service class like
在 Service 类中更改您的 URI 映射，例如
package com.duo.test.status;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
@Path("/api/*")
public class V1_status {
@GET
@Produces(MediaType.TEXT_HTML)
@Path("/v1/status/")
public String returnTitle()
{
return "<p> Java Web Serbice</p>";
}
}
回答by rogerdpack
It seems when I ran into this it was upgrading jersey from 1.0.2 to 1.1x and the logs would say
似乎当我遇到这个时，它正在将球衣从 1.0.2 升级到 1.1x 并且日志会说
INFO: Root resource classes found:
class org.x.y.MyClass
No provider classes found.
And then everything would be a 404, even though it says that the webapp successfully deployed, couldn't get to it at all.
然后一切都将是 404，即使它说 webapp 成功部署，也根本无法获得它。
Turns out that my
原来我的
<servlet-mapping>
<servlet-name>Webapp Human name</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
in web.xmlis no longer good enough for the new version of jersey, it needs to be
inweb.xml对于新版本的球衣来说已经不够好了，它需要
<url-pattern>/*</url-pattern>
<url-pattern>/*</url-pattern>
ref: http://jersey.576304.n2.nabble.com/Jersey-and-url-pattern-td4548025.html
参考：http: //jersey.576304.n2.nabble.com/Jersey-and-url-pattern-td4548025.html
