How to get memory usage of tomcat 7 using JMX API?
11,184
Solution 1
MBeanServer connection = ManagementFactory.getPlatformMBeanServer();
Set<ObjectInstance> set = connection.queryMBeans(new ObjectName("java.lang:type=Memory"), null);
ObjectInstance oi = set.iterator().next();
// replace "HeapMemoryUsage" with "NonHeapMemoryUsage" to get non-heap mem
Object attrValue = connection.getAttribute(oi.getObjectName(), "HeapMemoryUsage");
if( !( attrValue instanceof CompositeData ) ) {
System.out.println( "attribute value is instanceof [" + attrValue.getClass().getName() +
", exitting -- must be CompositeData." );
return;
}
// replace "used" with "max" to get max
System.out.println(((CompositeData)attrValue).get("used").toString());
Solution 2
code snippet for getting used memory for local/remote tomcat :
JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://{remote ip/localhost}:2020/jmxrmi");
JMXConnector jmxc = JMXConnectorFactory.connect(url);
MBeanServerConnection server = jmxc.getMBeanServerConnection();
Object o = jmxc.getMBeanServerConnection().getAttribute(new ObjectName("java.lang:type=Memory"), "HeapMemoryUsage");
CompositeData cd = (CompositeData) o;
System.out.println(cd.get("used"));
Solution 3
sample code
List memBeans = // get list of mbeans for (Iterator i = memBeans.iterator(); i.hasNext(); ) {
MemoryPoolMXBean mpool = (MemoryPoolMXBean)i.next();
MemoryUsage usage = mpool.getUsage();
String name = mpool.getName();
float init = usage.getInit()/1000;
float used = usage.getUsed()/1000;
float committed = usage.getCommitted()/1000;
float max = usage.getMax()/1000;
float pctUsed = (used / max)*100;
float pctCommitted = (committed / max)*100;
}
here and here are some links which can help
Comments
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sanre6 almost 2 years
Is it possible to get the memory usage statistics of a tomcat server using JMX API. Which Mbean can provide me this info? I am stuck at the formation of ObjectName in the below code
JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:2020/jmxrmi"); JMXConnector jmxc = JMXConnectorFactory.connect(url); MBeanServerConnection server = jmxc.getMBeanServerConnection(); Object o = jmxc.getMBeanServerConnection().getAttribute( new ObjectName("-----");
Wonder how jconsole draws the memory graphs, any pointers for the source code?
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sanre6 about 12 yearshow to get the list of mbeans i can only see getDomains() in MBeanServerConnection class
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sanre6 about 12 yearsthe above code is returning me a constant metric from jvm , not application wise
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sanre6 about 12 yearsi understood your code after reading about composite datatype , thanks