VisualVM

1、在$JAVA_HOME/bin 下创建一个新文件 jstatd.all.policy，编辑该文件，填入内容： grant codebase"file:${java.home}/../lib/tools.jar"{ permission java.security.AllPermission; }; 2、启动命令，默认监听1099端口并给该文件加上执行权限 chmod +x jstatd.all.policy jstatd -J-Djava.security.policy=jstatd.all.policy -J-Djava.rmi.server.hostname=127.0.0.1 注意:最好加上这个： -J-Djava.rmi.server. hostname =127.0.0.1 其中127.0.0.1地址也可以是被监控的机器地址 3、lsof -i:1099 查看端口是否正常被监听 4、jps IP 查看是否可用： 5、jvisualvm 添加ip为监控IP(例如:192.168.0.2) 默认端口为1099的远程机器，这样可以使用jstatd方式远程监控JVM 6、相比于使用jmx的方式，使用jstatd的方式能监控的功能要少一些，比如这个里面没有Threads等功能 参考文档： https://www.cnblogs.com/Pierre-de-Ronsard/p

I'm profiling a program with Visual VM. My program runs for a while and finally pops up a few plots using XChart showing the results. After the charts are displayed, I noticed in Visual VM some active threads "RMI TCP Accept", "Attach Listener", and "Signal Dispatcher". What are these threads? I assume they are there in connection with Visual VM only. Am I correct?? earcam Loosely answered by this post https://stackoverflow.com/a/7698906/573057 As you assume; Attach, Signal and RMI TCP Accept are for JMX monitoring by jConsole, VisualVM or similar. The others are for garbage collection (e.g.

Getting obj.id with an OQL query in Java VisualVM (1.8.0_45) returns JavaScript object id (a long value) instead of the value of the Java field. In other words JavaScript id field shadows the Java object id field. Java object value can be seen in the Instances browser, but how to retrieve it via VisualVM OQL? Currently there is no way to access Java object id field. This is a bug in OQL. You can use the following workaround: obj["wrapped-object"].getValueOfField("id") 来源： https://stackoverflow.com/questions/40568374/retrieve-id-field-values-via-visualvm-oql-query

I am trying to use visualVM for profiling a simple java application that I am debugging with Intellij. I start the application to debug, open visualVM, and I can see my application in the list. I can open it; however, I am unable to use sampling or profiling for my application. Other applications, such as Intellij, can be profiled just fine. When I check the visualVM logs I see: INFO [com.sun.tools.visualvm.jmx.impl.JmxModelImpl]: connect(2749) com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded more information:

Usually I see all these tabs in VisualVM for locally running Java programs: However, I have one local program which is currently only showing me Overview and Monitor (even though it usually shows all those shown above): Also interesting is that VisualVM itself doesn't present the Profile tab: All three of the programs shown are running with the same JVM with the same Java Home. What controls which tabs are shown for a particular program? How can I get them all back for my program showing just Overview and Monitor? I have Visual VM 1.3.5 (latest at this date) and JDK 1.7.0_17. I found that this

I have written this small (and brutally inefficient) class and wanted to profile it using the Java VisualVM. public class Test { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br.readLine(); int n = Integer.parseInt(args[0]); int fib = fib(n); System.out.println(fib); } private static int fib(int n) { if (n < 2) { return n; } return fib(n-1)+fib(n-2); } } The results are bizarre. The results are completely dominated by calls to ConnectionHandler.run(). (98.2%) sun.rmi.transport.tcp.TCPTransport

I want to profile a Java application with VisualVM, remotely via JMX. Because it's a NAT'ted and firewalled EC2 instance, I can't use the default RMI approach and need to use the optional JMXMP extensions, which I must first download. NOTE – IF YOU WANT TO USE A JMXMP CONNECTOR, DOWNLOAD THE JSR 160 REFERENCE IMPLEMENTATION FROM , AND ADD THE JMXREMOTE_OPTIONAL.JAR FILE TO YOUR CLASSPATH. YOU WILL FIND EXAMPLES OF USE OF THE JMXMP CONNECTORS IN THE JMX REMOTE API TUTORIAL INCLUDED WITH THE JSR 160 REFERENCE IMPLEMENTATION. http://docs.oracle.com/javase/6/docs/technotes/guides/jmx/overview