Liferay vaadin portlet 中的异步 Jersey 2 REST

Question

目前，我的 liferay tomcat 容器中有一个独立的 Jersey 2.x Web 应用程序，设置为异步运行。我还在 Liferay 中使用 Vaadin 构建了我的主要 portlet。

我想将我的 REST 服务移动到我的 vaadin 项目，以便我可以利用我的主应用程序中的休眠和缓存。

但是，当我移动所有代码以及 web.xml 文件中的 servlet 条目时，当我对服务进行 GET 调用时，它会引发以下异常。

有人做到了吗？我认为它与异步功能或弹簧有关？我正在运行 Liferay 6.1.1 GA2。

`SEVERE: Servlet.service() for servlet [TEKControl RESTFul API] in context with path [/tekwave-portlet] threw exception [javax.ws.rs.ProcessingExceptio`

`n: 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:331)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:106)
at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:259)
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 org.glassfish.jersey.internal.Errors.process(Errors.java:267)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:318)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:236)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1010)
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:373)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:382)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:345)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:220)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at sun.reflect.GeneratedMethodAccessor386.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.liferay.portal.kernel.bean.ClassLoaderBeanHandler.invoke(ClassLoaderBeanHandler.java:67)
at $Proxy526.doFilter(Unknown Source)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:167)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:95)
at com.liferay.portal.kernel.servlet.PortalClassLoaderFilter.doFilter(PortalClassLoaderFilter.java:70)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1813)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722) 

更新

当我调试它时，它会通过 GET 请求到达我正在调用的类，但它会在声明一些内容之后并在进入 GET 方法之前引发错误。下面是我的 GET 方法声明：

@GET
@Produces("application/xml")
public void AnswerPhoneCall(@Suspended final AsyncResponse asyncResponse, @Context UriInfo ui) {
    final MultivaluedMap<String, String> queryParams = ui.getQueryParameters();

    new Thread(new Runnable() {
        @Override
        public void run() {
            String ret = "Testing";
            asyncResponse.resume(ret);
        }
    }).start();
}

----工作解决方案---

由于 Liferay 调用程序过滤器导致了这个问题，而且我也不认为 Liferay 完全支持 Servlet 3.0，下面是我们想出的解决这个问题的方法。

添加一个实现“org.glassfish.jersey.servlet.ServletContainer”的类

import org.apache.catalina.Globals;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;

public class ServletContainer extends org.glassfish.jersey.servlet.ServletContainer {

    @Override
    public void service(ServletRequest request, ServletResponse response)
            throws ServletException, IOException {
        request.setAttribute(Globals.ASYNC_SUPPORTED_ATTR, true);
        super.service(request, response);
    }
}

将 portlet web.xml 中的 servlet 条目更改为上述类：

<servlet>
    <servlet-name>RESTFul API</servlet-name>
    <servlet-class>com.myportlet.api.jersey.ServletContainer</servlet-class>
    <init-param>
        <param-name>jersey.config.server.provider.packages</param-name>
        <param-value>com.myportlet.api</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
</servlet>
<servlet-mapping>
    <servlet-name>RESTFul API</servlet-name>
    <url-pattern>/api/*</url-pattern>
</servlet-mapping>

在 maven 中添加以下依赖项，如果这是您使用的内容

<dependency>
    <groupId>org.apache.geronimo.ext.tomcat</groupId>
    <artifactId>catalina</artifactId>
    <version>7.0.39.1</version>
    <scope>provided</scope>
</dependency>

Answer 1

请检查 server.xml 中的连接器属性

<Connector port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol"
               connectionTimeout="20000"
               redirectPort="8443" />

Answer 2

AFAIU，它与连接器属性无关。基本上正在发生的事情是 Liferay 的过滤器试图拦截对 Jersey REST Webservice servlet 的请求。您可能需要更改 web.xml 中 Liferay 过滤器的过滤器映射以排除 Jersey 的 servlet。

另一种可能更简洁的方法是，您可能希望开发一个"Web" plugin 来托管您的 REST 服务项目。我没有尝试过，但您可能想探索这个方向的可能性。