使用 jmx 从命令行获取堆转储

Question

是否可以从命令行使用 JMX 在 linux (CentOS) 上运行的进程上获取服务器堆转储？

无法打开VisualVM，无法安装jmap

Answer 1

可以用这个简单的代码来完成：

import com.sun.management.HotSpotDiagnosticMXBean;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.management.JMX;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

@SuppressWarnings("restriction")
public class CreateHeapDump
{
    public static void main(String[] args) throws Exception
    {
        String host = args[0];
        String port = args[1];

        JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://" + host + ":" + port + "/jmxrmi");
        JMXConnector jmxc = JMXConnectorFactory.connect(url, null);
        MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();
        ObjectName mbeanName = new ObjectName("com.sun.management:type=HotSpotDiagnostic");
        HotSpotDiagnosticMXBean bean = JMX.newMBeanProxy(mbsc, mbeanName, HotSpotDiagnosticMXBean.class, true);

        String fileName = "heap_dump_" + new SimpleDateFormat("dd.MM.yyyy HH.mm").format(new Date()) + ".hprof";
        boolean onlyLiveObjects = true;
        bean.dumpHeap(fileName, onlyLiveObjects);
    }
}

编译它：

javac CreateHeapDump.java

从命令行调用它：

java CreateHeapDump localhost 9010