嵌入式码头无法连接

Question

在应用程序中嵌入了带有以下代码的码头，但无法请求成功。 它一直在等待。

public static class TestHandler extends ContextHandler {
    public TestHandler(String contextPath) {
        super(contextPath);
    }

    @Override
    public void doHandle(String target, Request baseRequest, HttpServletRequest request,
            HttpServletResponse response) throws IOException, ServletException {
        super.doHandle(target, baseRequest, request, response);
        System.out.println("");
    }
}

public static void main(String[] args) throws Exception {

    Server server = new Server(new QueuedThreadPool(5, 4));
    ServerConnector connector = new ServerConnector(server);
    connector.setPort(9001);
    server.setConnectors(new Connector[] { connector });

    HandlerCollection handler = new HandlerCollection();
    ContextHandlerCollection contexts = new ContextHandlerCollection();
    contexts.setHandlers(new Handler[] { new TestHandler("/test") });

    handler.setHandlers(new Handler[] { contexts, new DefaultHandler() });
    server.setHandler(handler);
    server.start();
    server.dumpStdErr();
    server.join();
}

但是将服务器构造函数更改为另一个，就可以了，有人可以解释原因吗？ 我查了代码，找不到原因。谢谢！！

public static void main(String[] args) throws Exception {
    Server server = new Server(9001);

    // Server server = new Server(new QueuedThreadPool(5, 4));
    // ServerConnector connector = new ServerConnector(server);
    // connector.setPort(9001);
    // server.setConnectors(new Connector[] { connector });

    HandlerCollection handler = new HandlerCollection();
    ContextHandlerCollection contexts = new ContextHandlerCollection();
    contexts.setHandlers(new Handler[] { new TestHandler("/test") });

    handler.setHandlers(new Handler[] { contexts, new DefaultHandler() });
    server.setHandler(handler);
    server.start();
    server.dumpStdErr();
    server.join();
}

ps：使用 jetty-server 9.1.0.M0 版本

Answer 1

你需要在线程池中至少有 6 个：

"线程不足：max=5

将构造函数改成这样：

Server server = new Server(new QueuedThreadPool(60, 6));

更新：

我的 logback.xml (src/main/resources)

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="false" scanPeriod="10 seconds">

<appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
    <Target>System.out</Target>
    <encoder>
        <pattern>%p %d{HH:mm:ss} [%c{1}] - %m%n</pattern>
    </encoder>
</appender>

<logger name="org.eclipse.jetty" level="DEBUG" />

<root level="INFO">
    <appender-ref ref="stdout" />
</root>

堆栈跟踪：

...
INFO 11:25:18 [o.e.j.s.Server] - jetty-9.3.0.M0
WARN 11:25:18 [o.e.j.u.c.AbstractLifeCycle] - FAILED org.eclipse.jetty.server.Server@9f10da5d: java.lang.IllegalStateException: Insufficient threads: max=5 < needed(acceptors=1 + selectors=4 + request=1)
java.lang.IllegalStateException: Insufficient threads: max=5 < needed(acceptors=1 + selectors=4 + request=1)
at org.eclipse.jetty.server.Server.doStart(Server.java:351) ~[jetty-server-9.3.0.M0.jar:9.3.0.M0]
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) ~[jetty-util-9.3.0.M0.jar:9.3.0.M0]
at TestHandler.main(TestHandler.java:43) [classes/:na]
Exception in thread "main" java.lang.IllegalStateException: Insufficient threads: max=5 < needed(acceptors=1 + selectors=4 + request=1)
at org.eclipse.jetty.server.Server.doStart(Server.java:351)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at TestHandler.main(TestHandler.java:43)