Java 访问远程 MBean 服务器
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Accessing a remote MBean server
提问by parkr
I am running a client/server application using JBoss.
我正在使用 JBoss 运行客户端/服务器应用程序。
How can I connect to the server JVM's MBeanServer? I want to use the MemoryMX MBean to track the memory consumption.
如何连接到服务器 JVM 的 MBeanServer？我想使用 MemoryMX MBean 来跟踪内存消耗。
I can connect to the JBoss MBeanServer using JNDI lookup but the java.lang.MemoryMX MBean is not registered with the JBoss MBeanServer.
我可以使用 JNDI 查找连接到 JBoss MBeanServer，但 java.lang.MemoryMX MBean 未注册到 JBoss MBeanServer。
EDIT: The requirement is for programmatic access to the memory usage from the client.
编辑：要求是从客户端以编程方式访问内存使用情况。
采纳答案by skaffman
Unlike the JBoss server's MBeanServer, the JVM's MBean server doesn't allow remote monitoring by default. You need to set various system properties to allow that:
与 JBoss 服务器的 MBeanServer 不同，JVM 的 MBean 服务器默认不允许远程监控。您需要设置各种系统属性以允许：
http://java.sun.com/javase/6/docs/technotes/guides/management/agent.html
http://java.sun.com/javase/6/docs/technotes/guides/management/agent.html
回答by oxbow_lakes
Have you tried launching a JConsole(is $JAVA_HOME/bin) to connect with the server? You should be able to view memory stats from there
您是否尝试启动JConsole(is $JAVA_HOME/bin) 与服务器连接？您应该能够从那里查看内存统计信息
回答by Shimi Bandiel
A code example from an IBM article: link
IBM 文章中的代码示例：链接
MBeanServerConnection serverConn;
try {
//connect to a remote VM using JMX RMI
JMXServiceURL url = new JMXServiceURL( "service:jmx:rmi:///jndi/rmi://<addr>");
JMXConnector jmxConnector = JMXConnectorFactory.connect(url);
serverConn = jmxConnector.getMBeanServerConnection();
ObjectName objName = new
ObjectName(ManagementFactory.RUNTIME_MXBEAN_NAME);
// Get standard attribute "VmVendor"
String vendor =
(String) serverConn.getAttribute(objName, "VmVendor");
} catch (...) { }
回答by Krolique
I wrote a class like this:
我写了一个这样的类：
import javax.management.remote.JMXServiceURL;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
public class JVMRuntimeClient
{
static void main(String[] args) throws Exception
{
if (args == null)
{
System.out.println("Usage: java JVMRuntimeClient HOST PORT");
}
if(args.length < 2)
{
System.out.println("Usage: java JVMRuntimeClient HOST PORT");
}
try
{
JMXServiceURL target = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://"+args[0]+":"+args[1]+"/jmxrmi");
JMXConnector connector = JMXConnectorFactory.connect(target);
MBeanServerConnection remote = connector.getMBeanServerConnection();
/**
* this is the part where you MUST know which MBean to get
* com.digitalscripter.search.statistics:name=requestStatistics,type=RequestStatistics
* YOURS WILL VARY!
*/
ObjectName bean = new ObjectName("com.digitalscripter.search.statistics:name=requestStatistics,type=RequestStatistics");
MBeanInfo info = remote.getMBeanInfo(bean);
MBeanAttributeInfo[] attributes = info.getAttributes();
for (MBeanAttributeInfo attr : attributes)
{
System.out.println(attr.getDescription() + " " + remote.getAttribute(bean,attr.getName()));
}
connector.close();
}
catch(Exception e)
{
System.out.println(e.getMessage());
System.exit(0);
}
}
}
回答by rstolle
The following code lists all mbeansof a given (jmx enabled) java application with their attributes and operations grouped by the domain. Just start the java app you wanna monitor with a fixed jmx port, e.g. by using these vm parameters:
以下代码列出了给定（启用 jmx）java 应用程序的所有 mbean，以及它们按域分组的属性和操作。只需使用固定的 jmx 端口启动您想要监控的 Java 应用程序，例如使用这些 vm 参数：
-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=9000
-Dcom.sun.management.jmxremote.local.only=false
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=9000
-Dcom.sun.management.jmxremote.local.only=false
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun .management.jmxremote.authenticate=false
Then run this main:
然后运行这个主要：
import javax.management.*;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import java.io.IOException;
public class JmxListAll {
public static void main(String[] args) throws IOException, MalformedObjectNameException, IntrospectionException, InstanceNotFoundException, ReflectionException {
/*
1. JMXServiceURL.
*/
String jmxHost = "localhost:9000"; // exactly like jconsole localhost:9026
String url = "service:jmx:rmi:///jndi/rmi://" + jmxHost + "/jmxrmi";
JMXServiceURL serviceURL = new JMXServiceURL(url);
/*
2. JMXConnector and the actual serverConnection
*/
JMXConnector connector = JMXConnectorFactory.connect(serviceURL);
MBeanServerConnection serverConnection = connector.getMBeanServerConnection();
/*
3. Walk through the domains and their objects
*/
System.out.println("\n Now we have a look at " + serverConnection.getMBeanCount() + " mbeans!");
int objectCount = 0;
for (String domain : serverConnection.getDomains()) {
System.out.println("\n***********************************************************************************");
System.out.println("DOMAIN: " + domain);
// query all the beans for this domain using a wildcard filter
for (ObjectName objectName : serverConnection.queryNames(new ObjectName(domain + ":*"), null)) {
System.out.println(" objectName " + ++objectCount + ": " + objectName);
MBeanInfo info = serverConnection.getMBeanInfo(objectName);
for (MBeanAttributeInfo attr : info.getAttributes()) {
System.out.print(" attr: " + attr.getDescription());
try {
String val = serverConnection.getAttribute(objectName, attr.getName()).toString();
System.out.println(" -> " + abbreviate(val));
} catch (Exception e) {
System.out.println(" FAILED: " + e);
}
}
for (MBeanOperationInfo op : info.getOperations()) {
System.out.println(" op: " + op.getName());
}
}
}
}
static String abbreviate(String text) {
if (text != null && text.length() > 42) {
return text.substring(0, 42) + "...";
} else {
return text;
}
}
}
As you should see, in the java.langdomain are several memory related mbeans. Pick the one you need.
正如您应该看到的，在java.lang域中有几个与内存相关的 mbean。选择您需要的那个。
