异步进程在javax.ws.rs.*(REST客户端)中不工作

Question

我使用javax(2.26版本(演示了REST API中的异步过程。当我尝试时，我得到了"；当前链的筛选器或servlet不支持异步操作"我不知道该怎么办。我尝试了很多方法，但都没有成功。

以下是资源文件Resource.java

import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.container.AsyncResponse;
import javax.ws.rs.container.Suspended;
import javax.ws.rs.core.MediaType;
import com.jersey.rest.User;
@Path("/async")
public class AsynDemo {

@POST
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public void asyncMethod(@Suspended final AsyncResponse response, User user) {
new Thread() {
public void run() {
response.resume(true);
}
}.start();
}
}

Pom.xml

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.jersey</groupId>
<artifactId>rest</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>rest</name>
<build>
<finalName>rest</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<inherited>true</inherited>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey</groupId>
<artifactId>jersey-bom</artifactId>
<version>${jersey.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet</artifactId>
<!-- use the following artifactId if you don't need servlet 2.x compatibility -->
<!-- artifactId>jersey-container-servlet</artifactId -->
</dependency>
<dependency>
<groupId>org.glassfish.jersey.inject</groupId>
<artifactId>jersey-hk2</artifactId>
<version>2.26</version>
</dependency>

<dependency>
<groupId>javax.activation</groupId>
<artifactId>activation</artifactId>
<version>1.1.1</version>
</dependency>
<!-- uncomment this to get JSON support-->
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
</dependency>

<!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>

<dependency> 
<groupId>com.google.code.gson</groupId> 
<artifactId>gson</artifactId> 
<version>2.6.2</version> 
</dependency>

<dependency>
<groupId>org.glassfish.jersey.security</groupId>
<artifactId>oauth2-client</artifactId>
</dependency>

<dependency>
<groupId>com.auth0</groupId>
<artifactId>java-jwt</artifactId>
<version>3.10.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.11.2</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.11.0</version>
</dependency>

</dependencies>
<properties>
<jersey.version>2.26-b03</jersey.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>

客户端检查java文件

import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;
import com.jersey.rest.User;
public class MainTesting {
public static void main(String[] args) {

Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://localhost:9090/rest/jwt/async"); 
AsyncInvoker invoker = target.request().async();

Future<Boolean> response = invoker.post(Entity.entity(new User(), MediaType.APPLICATION_JSON), Boolean.class);
try {
System.out.println(response.get());
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}

}
}

应用程序错误

SEVERE: Servlet.service() for servlet [Jersey jwt Application] in context with path [/rest] threw exception [java.lang.UnsupportedOperationException: Asynchronous processing not supported on Servlet 2.x container.] with root cause
java.lang.UnsupportedOperationException: Asynchronous processing not supported on Servlet 2.x container.
at org.glassfish.jersey.servlet.WebComponent$3.suspend(WebComponent.java:137)
at org.glassfish.jersey.servlet.internal.ResponseWriter.suspend(ResponseWriter.java:125)
at org.glassfish.jersey.server.ServerRuntime$AsyncResponder.suspend(ServerRuntime.java:921)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:326)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:337)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at..................```
Tomcat exception
```WARNING: Unable to start async because the following classes in the processing chain do not support async [org.glassfish.jersey.servlet.ServletContainer]
java.lang.IllegalStateException: A filter or servlet of the current chain does not support asynchronous operations.
at org.apache.catalina.connector.Request.startAsync(Request.java:1692)
at org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:1050)
at org.glassfish.jersey.servlet.async.AsyncContextDelegateProviderImpl$ExtensionImpl.getAsyncContext(AsyncContextDelegateProviderImpl.java:112)
at org.glassfish.jersey.servlet.async.AsyncContextDelegateProviderImpl$ExtensionImpl.suspend(AsyncContextDelegateProviderImpl.java:96)
at org.glassfish.jersey.servlet.internal.ResponseWriter.suspend(ResponseWriter.java:125)
at org.glassfish.jersey.server.ServerRuntime$AsyncResponder.suspend(ServerRuntime.java:921)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:326)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:337)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors$1.call(Err....
Aug 21, 2020 5:07:24 PM org.glassfish.jersey.servlet.internal.ResponseWriter suspend
WARNING: Attempt to put servlet request into asynchronous mode has failed. Please check your servlet configuration - all Servlet instances and Servlet filters involved in the request processing must explicitly declare support for asynchronous request processing.
java.lang.IllegalStateException: A filter or servlet of the current chain does not support asynchronous operations.
at org.apache.catalina.connector.Request.startAsync(Request.java:1692)
at org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:1050)
at org.glassfish.jersey.servlet.async.AsyncContextDelegateProviderImpl$ExtensionImpl.getAsyncContext(AsyncContextDelegateProviderImpl.java:112)
at org.glassfish.jersey.servlet.async.AsyncContextDelegateProviderImpl$ExtensionImpl.suspend(AsyncContextDelegateProviderImpl.java:96)
at org.glassfish.jersey.servlet.internal.ResponseWriter.suspend(ResponseWriter.java:125)
at org.glassfish.jersey.server.ServerRuntime$AsyncResponder.suspend(ServerRuntime.java:921)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:326)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
at org.glassfish.jersey.server.Serv.....
Aug 21, 2020 5:07:24 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Jersey jwt Application] in context with path [/rest] threw exception [javax.ws.rs.ProcessingException: Attempt to suspend a connection of an asynchronous request failed in the underlying container.] with root cause
javax.ws.rs.ProcessingException: Attempt to suspend a connection of an asynchronous request failed in the underlying container.
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:327)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:337)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
....```
Could you help me to solve this? :)

Answer 1

在web.xml servlet定义中添加<async-supported>true</async-supported>。

<servlet>
<servlet-name>Jersey jwt Application</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>com.jersey.jwt</param-value>
</init-param>
<async-supported>true</async-supported>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey jwt Application</servlet-name>
<url-pattern>/jwt/*</url-pattern>
</servlet-mapping>

它解决了这个问题。