Unable to parse visualvm nps generated by visualvm 2.0.1

[crzyjcky]

Hi, I ran into issue where sjk seems unable to understand nps format.

VisualVM: v2.0.1
Jdk: v14

Unable to parse file './profiler-snapshot2.nps'. Parser config: SJK Thread Dump (Magic: TRACEDUMP_1, TRACEDUMP_2), SJK Genereic Event Dump (Magic: EVENTDUMP_1), JStack dump parser
Input files
  ./profiler-snapshot2.nps

Unable to parse file './profiler-snapshot2.nps'. Parser config: SJK Thread Dump (Magic: TRACEDUMP_1, TRACEDUMP_2), SJK Genereic Event Dump (Magic: EVENTDUMP_1), JStack dump parser
Stream reader error: java.io.IOException: Invalid magic
java.io.IOException: Invalid magic
	at org.gridkit.jvmtool.stacktrace.MagicReader.readMagic(MagicReader.java:33)
	at org.gridkit.jvmtool.stacktrace.ThreadEventCodec.createEventReader(ThreadEventCodec.java:30)
	at org.gridkit.jvmtool.AbstractEventDumpSource.openReader(AbstractEventDumpSource.java:151)
	at org.gridkit.jvmtool.AbstractThreadDumpSource.openReader(AbstractThreadDumpSource.java:119)
	at org.gridkit.jvmtool.AbstractEventDumpSource$1.produceNext(AbstractEventDumpSource.java:128)
	at org.gridkit.jvmtool.event.ChainedEventReader.hasNext(ChainedEventReader.java:68)
	at org.gridkit.jvmtool.event.ShieldedEventReader.seekNext(ShieldedEventReader.java:66)
	at org.gridkit.jvmtool.event.ShieldedEventReader.hasNext(ShieldedEventReader.java:95)
	at org.gridkit.jvmtool.event.ShieldedEventReader.seekNext(ShieldedEventReader.java:66)
	at org.gridkit.jvmtool.event.ShieldedEventReader.hasNext(ShieldedEventReader.java:95)
	at org.gridkit.jvmtool.event.MorphingEventReader.hasNext(MorphingEventReader.java:33)
	at org.gridkit.jvmtool.hflame.JsonFlameDataSet.feed(JsonFlameDataSet.java:97)
	at org.gridkit.jvmtool.hflame.cmd.FlameGraphGeneratorCmd$FlameGen.run(FlameGraphGeneratorCmd.java:100)
	at org.gridkit.jvmtool.cli.CommandLauncher.start(CommandLauncher.java:134)
	at org.gridkit.jvmtool.SJK.main(SJK.java:14)
0 samples processed
No data omit report generation```

[aragozin]

SJK is using VisualVM from JDK classpath to parse files. That means parsing of VisualVM files will work only on Java 8.

[palec911]

@aragozin I have the same issue but I'm explicitly using the same java to run sjk as the one i used to run visualVM and export the nps file with : /usr/lib/jvm/jdk1.8.0_202_x64/bin/java -jar sjk.jar flame -f snap1.nps -o report.html
Also made sure with update-alternatives --config java and JAVA_HOME that my default java is the same
Am i missing something?

[aragozin]

Trick in SJK is to use Visual VM jars from local JDK (which have Visual VM 1.x bundled). Probably file format have changed in Visual VM 2.x
Provided poor quality of Visual VM profiling data, I'm not confident I would like to include its parser to SJK. But I need to look at new version first.
So far I can only suggest you to sample with SJK instead of VisualVM if you want process data with SJK. BTW Flight Recorder files a supported too, so if you on Java 11+ you can use with SJK too.

[phillipse01]

@palec911 I am having the same issue - were you able to resolve this?