jconsole

问题 Is it possible to create a JMX client that doesn't run on the JVM? From my understanding JMX is a protocol on top of other protocols (like RMI) so it should be possible to create a C or Go client. Any reason why this hasn't been done? I am aware of Jolokia and realise it can be used as a proxy. 来源： https://stackoverflow.com/questions/49207999/non-java-jmx-client

问题 I can see that some methods on the jconsole are disabled. Given below is the screenshot for com.sun.management.ThreadMXBean The javadocs for these MBean methods do not specify anything about the accessibility part. I think it is a security feature, but I am not able to get a concrete answer for this. The obvious second part to this question is how to create custom MBean implementations which can be selectively disabled on the jconsole. Given below is the system config : JConsole version "1.7

问题 It seems that I've never got this to work in the past. Currently, I KNOW it doesn't work. But we start up our Java process: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=6002 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false I can telnet to the port, and "something is there" (that is, if I don't start the process, nothing answers, but if I do, it does), but I can not get JConsole to work filling in the IP and port. Seems like it

问题 Is it possible to identify the C++ allocations that are unfreed? The C++ calls are made using JNI from my Java application to which I'm planning to attach jconsole. If that is possible please tell how (whether in an exported dump file or otherwise) you have been able to see the heap objects that were left unfreed. 回答1: No. C++ code doesn't allocate memory from anywhere that the JVM can see. (Unless you're talking about Java objects allocated from C++.) 来源： https://stackoverflow.com/questions

问题 I am studying about Java JMX and JConsole. I am curious about the memory management abilities of JConsole. For example, there is a "Perform GC" button in the Memory tab : Suppose I have simple Java app that eats up memory, something like this : public class MemoryEater { public static void main(String[] args) { Vector v = new Vector(); while (true) { byte b[] = new byte[1048576]; v.add(b); Runtime rt = Runtime.getRuntime(); System.out.println( "free memory: " + rt.freeMemory() ); } } } Would

问题 Oracle/Sun says its fine as long as you don't run it locally on production box? http://download.oracle.com/javase/1.5.0/docs/guide/management/jconsole.html Note: Using jconsole to monitor a local application is useful for development and prototyping, but is not recommended for production environments, because jconsole itself consumes significant system resources. Remote monitoring is recommended to isolate the jconsole application from the platform being monitored. Have you ever enabled it in

问题 I tried to run JConsole to analyze the memory used by a running process, but JConsole doesn't show me processes even though I am absolutely sure that one is running (in addition to that it should show JConsole in the process list as well but it doesn't). Does anyone have an idea why it doesn't show any processes? Cheers 回答1: at window prompt, run echo %TMP%, it will give you default temp dir. Go to that directory and find directory named hsperfdata_ where is your login. This is directory to

问题 I'm currently testing my proof of concept prototype dealing with XML schema, and built around a very memory consuming external library for tree automata (for which I've got the sources), I'd like to plot "real peak" (heap) memory consumption of the different runs with increasing schema sizes (the metric used fits my purpouse and do no affect the question), or at least a reasonable approximation of it. To give an order of magnitude, for a run with a real peak of 100MB (I tested it running

问题 We have distributed web application developed few years back on JDK 5. How JMX will help this application? 1) Will it help me to monitor performance (Memory, CPU and Network & Disk IO)? 2) If so then application is deployed in multiple servers,how can I monitor in one single dashboard? 3) Do I have to make any new code changes to the existing application or can I monitor without code changes? 4) What else can we do apart from performance monitoring? Because name is Management Extensions (MX)

问题 I have a servlet. But it is not working as desired. Hence for debugging purposes, I want to print statements to the java console(the one that can be opened using the java icon in taskbar). However, if I use System.out.println("message"), it doesnt display in java console. Is there any alternative way where I can display messages to the console from the servlet? Or can anyone suggest me an alternative way to display messages to any other console? 回答1: In which console do you expect it to