Java 为什么我在使用 JMX 时收到错误“连接被拒绝”

Why am I getting the error "connection refused" with JMX

提问by Ivan Mushketyk

I am unable to connect to JMX object. Here is how I create a JMX object:

我无法连接到 JMX 对象。这是我创建 JMX 对象的方法：

public static void main(String... args) {
    MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    try {
        ObjectName name = new ObjectName("org.javasimon.jmx.example:type=Simon");
        if (mbs.isRegistered(name)) {
            mbs.unregisterMBean(name);
        }
        SimonManagerMXBean simonManagerMXBean = new SimonManagerMXBeanImpl(SimonManager.manager());
        mbs.registerMBean(simonManagerMXBean, name);
        System.out.println("SimonManagerMXBean registerd under name: "+name);

    } catch (JMException e) {
        System.out.println("SimonManagerMXBean registration failed!\n"+e);
    }

    while (true) {
        // waiting for connections
    }
}

This is a code for connecting to the remote JMX object:

这是连接远程 JMX 对象的代码：

JMXServiceURL url = new JMXServiceURL("service:jmx:rmi://127.0.0.1:9999/jndi/rmi://127.0.0.1:1099/jmxrmi");
JMXConnector jmxc = JMXConnectorFactory.connect(url, null);
MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();
SimonManagerMXBean simonManagerMXBean = JMX.newMXBeanProxy(mbsc, new ObjectName("org.javasimon.jmx.example:type=Simon"), SimonManagerMXBean.class);
return simonManagerMXBean;

Unfortunatelly I receive the following error:

不幸的是，我收到以下错误：

java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is: 
    java.net.ConnectException: Connection refused: connect]
    at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:338)
    at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:248)
    at my.code.RemoteSimonManagerFactoryImpl.createSimonManager(RemoteSimonManagerFactoryImpl.java:24)
    at my.code.Demo.main(DemoAggregation.java:21)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is: 
    java.net.ConnectException: Connection refused: connect]
    at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:101)
    at com.sun.jndi.toolkit.url.GenericURLContext.lookup(GenericURLContext.java:185)
    at javax.naming.InitialContext.lookup(InitialContext.java:392)
    at javax.management.remote.rmi.RMIConnector.findRMIServerJNDI(RMIConnector.java:1886)
    at javax.management.remote.rmi.RMIConnector.findRMIServer(RMIConnector.java:1856)
    at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:255)
    ... 9 more
Caused by: java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is: 
    java.net.ConnectException: Connection refused: connect
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:601)
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:198)
    at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
    at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:322)
    at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
    at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:97)
    ... 14 more
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
    at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    at java.net.Socket.connect(Socket.java:529)
    at java.net.Socket.connect(Socket.java:478)
    at java.net.Socket.<init>(Socket.java:375)
    at java.net.Socket.<init>(Socket.java:189)
    at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
    at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:595)
    ... 19 more

If I try to connect to my JMX server (as to local process) using "jconsole" utility, I first get "ConnectionFailedSSL1" error, but when I click "Insecure" button in the error form, I connect successfully.

如果我尝试使用“jconsole”实用程序连接到我的 JMX 服务器（对于本地进程），我首先会收到“ConnectionFailedSSL1”错误，但是当我单击错误表单中的“Insecure”按钮时，我成功连接。

Both server and client are on the same computer.

服务器和客户端都在同一台计算机上。

I am using Windows 7 x64. Windows firewall is disabled.

我正在使用 Windows 7 x64。Windows 防火墙已禁用。

采纳答案by Gray

Caused by: java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:

引起：java.rmi.ConnectException：连接拒绝主机：127.0.0.1；嵌套异常是：

Most likely you are not running your server with the right JVM parameters. Jconsole uses a different mechanism to find and to connect to local processes. Your client code is trying to use TCP/IP to connect to your server. To turn this on you'll need to add something like the following to your Java command line on your server:

很可能您没有使用正确的 JVM 参数运行服务器。Jconsole 使用不同的机制来查找和连接到本地进程。您的客户端代码正在尝试使用 TCP/IP 连接到您的服务器。要启用此功能，您需要在服务器上的 Java 命令行中添加如下内容：

-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=1099

See: How to activate JMX on my JVM for access with jconsole?

请参阅：如何在我的 JVM 上激活 JMX 以使用 jconsole 进行访问？

As an aside, you might want to consider using my SimpleJMXlibrarywhich does all this code for you. It includes a JMX client code as well.

顺便说一句，您可能需要考虑使用我的SimpleJMX库，它为您完成所有这些代码。它还包括 JMX 客户端代码。

回答by Ryan D

I received the same error. In my case I was using a @PostConstruct annotation and that method was attempting to use the RMI connection before Spring had a chance to configure the connection.

我收到了同样的错误。就我而言，我使用的是 @PostConstruct 注释，并且该方法试图在 Spring 有机会配置连接之前使用 RMI 连接。

It didn't end up being anything wrong with the configuration of the connection, just that I accidentally tried to use it before it was ready. Hope this might help someone.

连接的配置最终没有出现任何问题，只是我在它准备好之前不小心尝试使用它。希望这可以帮助某人。

回答by Grigory Kislin

I've manage run Tomcat with JMX (Tomcat 8, Windows) by:

我通过以下方式使用 JMX（Tomcat 8，Windows）管理运行 Tomcat：

1. add -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=1099 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false

2. run with admin permissions

1. 添加 -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=1099 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false

2. 以管理员权限运行

回答by K?v?lc?m

check your tomcat's bin folder for catalina.sh file. open it up and find java server parameters. add thoose followings to $JAVA_OPTS on any line you want.

检查您的 tomcat 的 bin 文件夹中是否有 catalina.sh 文件。打开它并找到java服务器参数。在您想要的任何行上将以下内容添加到 $JAVA_OPTS 中。

-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=1099

you are done!

你完成了！