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Questions tagged [jmc]

Java Flight Recorder and Java Mission Control together create a complete tool chain to continuously collect low level and detailed runtime information enabling after-the-fact incident analysis.

Java Flight Recorder is a profiling and event collection framework built into the Oracle JDK. It allows Java administrators and developers to gather detailed low level information about how the Java Virtual Machine (JVM) and the Java application are behaving. Java Mission Control is an advanced set of tools that enables efficient and detailed analysis of the extensive of data collected by Java Flight Recorder. The tool chain enables developers and administrators to collect and analyze data from Java applications running locally or deployed in production environments.

http://www.oracle.com/technetwork/java/javaseproducts/mission-control/index.html

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What are `$adapted$` methods I see in JMC/JFR?

When benchmarking some scala code using Java Flight Recorder/ Mission Control, I can see a bunch of methods that have an $adapted$ in the name. I can think of a few possibilities for this, looking at the signature. Are these the same as java-8…
Luciano
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trying to automate java mission control, is it possible?

Is it possible to automate the java mission control to dump a 1 minute flight recording to a folder every hour? For example : a server is running an application 24/7 and I would love to have the .jfr file automatically dumped to a file every hour
breddie forden
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not able to open jmc for java version jdk1.8.0_191.jdk

I have a mac system. Whenever i try to open java JMC, it doesn't open. I can just see maximise, minimise and close buttons for the dialog box. The jdk version im using is jdk1.8.0_191.jdk.
Rohan RM
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Java Thread dump with JCMD

I am using Java1.8 in Ubuntu Linux machine. Created a thread dump with below command: jcmd 1670 Thread.print > Thread.jfr Copied File to local MAC machine and double clicked to open in JMC. It failed to open. HOw to open it? I tried to open same…
AKB
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Unable to open flight recorder in JMC for Java application and Eclipse IDE

When I try to run flight recorder it takes a very long time in loading and then crashes, and throws an exception after a while: Connection refused to host: 17.226.xx.yyyy; nested exception is: java.net.ConnectException: Operation timed out…
user3204053
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how to return object value while using spring boot jmx

I am using spring boot jmx to remotely execute the method when a change happen in database. Every thing works well and I could monitor my app using jmc.exe in windows when I use primitive data type as return value . Now I need to return Object(not…
Fatemeh Karbalaie
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Interpretation of jmc flight recorder data parked threads

I am trying to interpret a jmc flight recording data. Seeing a definite number of threads all basically in parked state. What does this signify? Also attached is the CPU load during the time. It seems that JVM CPU is lot lesser than machine CPU…
Sathyakumar Seshachalam
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How to profile thown exception in Java Mission Control?

I discovered an unpleasure behavior with JMC when execute a "Flight Recording" with tracking of all exceptions enabled. After recording into panels: Code -> Exceptions Events -> Histogram -> "Event type" as "Java Application/Java Exception" and…
Vincenzo Marrazzo
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Java Mission Control what do the spaces mean?

I want to profile my class, it is something like a buffer where I save my user's data and get it after. I've created main method and run the test method in endless cycle there. public void test(){ buffer.add(n1); Message message =…
Viacheslav Kolybelkin
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See type of Garbage Collector in Java Mission Control

How to see type of Garbage Collector in Java Mission Control? I investigated all tabs including MBeans Browser, but didn't find the type of GC. I can only suppose it by memory regions enumerated on the Memory tab.
Aleks Ya
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Custom JFR Java mission control events

I would like to emit custom events in jmc -I've came across the blog post about jfr custom events - http://hirt.se/blog/?p=444 . The author however stressed that this feature may be depracted in the future. Since the jmc is not open source I am…
user3364192
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Can one trust jmc(Java mission control) when doing performance analysis?

Jave mission control has some great features. For example one can see the "Hot Methods" of the application or there are "Call Tree" section when one can find top consuming functions call hierarchy. But I am wondering can one really rely on profiling…
Vardan Hovhannisyan
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JMC doesn't show hot methods and packages

I'm trying to find problem methods in my server program with JMC. When I run server locally (on Windows) and start Flight Recorder from JMC - all works fine. JMC properly shows data in Code tab: Hot Methods, Call Tree, etc But when I trying to…
turbanoff
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Java flight recorder programmatically parsing

I'm trying to Parse JFR dump using JAVA. I followed this blog, http://hirt.se/blog/?p=446 . But these methods are deprecated now. Is there any supported parsers for JFR to JAVA? if not can you point me is it possible to retrieve data from JFR dump?…
Vithulan
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Java mission control - visualize event

Is it possible to visualize JFR events on chart? Sure I can browse them in log section but I'd like to visiualize them on chart also. A good example would be "Machine total" attribute from "CPU Load" event. If it is possible how to achieve it?
user3364192
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