Getting error while recording JFR

Question

I am trying to record JFR for a java application hosted in tomcat server. I have used following jvm args .

-XX:+UnlockCommercialFeatures -XX:+FlightRecorder

And i am using following linux command to record the JFR.

 /opt/java/perf/jdk1.7.0_79/bin/jcmd 32627 JFR.start duration=900s 
   settings=/opt/profile.jfc filename=/opt/flight_17-Mar-2016.jfr

But i am getting this error :

**32627:
java.text.ParseException: JSON object must begin with '{', line=0, column=0 : 
 <?xml version="1.0" encodi    ng="UTF-8"?>
<configuration version="1.0" name="Profiling" description="Lo**

Please suggest if anyone has any idea about this. Thanks in advance.

Are you sure you are running the same version of Java for jcmd and the program profiled? — Peter Lawrey, Mar 17 '16 at 11:13
if you meant java version for jcmd and profile.jfc, yes they belong to same version of java.. — Sophiya, Mar 17 '16 at 11:16
I meant the `jvm` you are monitoring and jcmd. There are differences between Java 7 and 8. — Peter Lawrey, Mar 17 '16 at 11:17
My guess is that they switched file format from JSON to XML. — Peter Lawrey, Mar 17 '16 at 11:35

score 0 · Answer 1 · answered Mar 26 '18 at 12:59

JDK 7u40 was the first Oracle JDK release that had full Java Flight Recorder support. Releases prior to that didn't have any JVM events, so it would make little sense to configure it using a settings file.

When JVM events were added to Hotspot, the file format was updated so it would better support configuration from Java Mission Control, which meant a switch from JSON to XML.

Fix is to use a later release of the Oracle JDK.

Getting error while recording JFR

1 Answers1