# Generate reports failed (sometimes)

**URL:** <https://community.gatling.io/t/generate-reports-failed-sometimes/1081>\
**Category:** Gatling (Open-Source)\
**Created:** [June 6, 2014, 2:42pm UTC](https://community.gatling.io/t/generate-reports-failed-sometimes/1081 "2014-06-06T14:42:08Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Cyril\_Souti](https://avatars.discourse-cdn.com/v4/letter/c/5daacb/32.png) [@Cyril\_Souti](https://community.gatling.io/u/Cyril_Souti)\
**Post date:** [June 6, 2014, 2:42pm UTC](https://community.gatling.io/t/generate-reports-failed-sometimes/1081/1 "2014-06-06T14:42:08Z")

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Hi,

I’ve this error which appears sometimes when generation reports. It’s not systematic.

Here simulation.log : [https://drive.google.com/file/d/0B35VlJiv5im5bmFQU2F2cDR0WDA/edit?usp=sharing](https://drive.google.com/file/d/0B35VlJiv5im5bmFQU2F2cDR0WDA/edit?usp=sharing)

Exception in thread “main” java.lang.reflect.InvocationTargetException  
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)  
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)  
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)  
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)  
at io.gatling.core.result.reader.DataReader$.newInstance(DataReader.scala:26)  
at io.gatling.app.Gatling.dataReader$lzycompute$1(Gatling.scala:235)  
at io.gatling.app.Gatling.io$gatling$app$Gatling$$dataReader$1(Gatling.scala:235)  
at io.gatling.app.Gatling$$anonfun$start$1.apply(Gatling.scala:242)  
at io.gatling.app.Gatling$$anonfun$start$1.apply(Gatling.scala:242)  
at io.gatling.app.Gatling.generateReports$1(Gatling.scala:170)  
at io.gatling.app.Gatling.start(Gatling.scala:242)  
at io.gatling.app.Gatling$.fromMap(Gatling.scala:52)  
at io.gatling.app.Gatling$.runGatling(Gatling.scala:77)  
at io.gatling.app.Gatling$.runGatling(Gatling.scala:56)  
at io.gatling.app.Gatling$.main(Gatling.scala:48)  
at io.gatling.app.Gatling.main(Gatling.scala)  
Caused by: scala.MatchError: - with linked exception: (of class java.lang.String)  
at io.gatling.charts.result.reader.FileDataReader$$anonfun$io$gatling$charts$result$reader$FileDataReader$$firstPass$1.apply(FileDataReader.scala:95)  
at io.gatling.charts.result.reader.FileDataReader$$anonfun$io$gatling$charts$result$reader$FileDataReader$$firstPass$1.apply(FileDataReader.scala:91)  
at scala.collection.Iterator$class.foreach(Iterator.scala:727)  
at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)  
at io.gatling.charts.result.reader.FileDataReader.io$gatling$charts$result$reader$FileDataReader$$firstPass(FileDataReader.scala:91)  
at io.gatling.charts.result.reader.FileDataReader$$anonfun$6.apply(FileDataReader.scala:148)  
at io.gatling.charts.result.reader.FileDataReader$$anonfun$6.apply(FileDataReader.scala:148)  
at io.gatling.charts.result.reader.FileDataReader.doWithInputFiles(FileDataReader.scala:60)  
at io.gatling.charts.result.reader.FileDataReader.(FileDataReader.scala:148)  
… 16 more

Regards,

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**Author:** ![Excilys](https://avatars.discourse-cdn.com/v4/letter/e/8797f3/32.png) [@Excilys](https://community.gatling.io/u/Excilys)\
**Post date:** [June 6, 2014, 3:02pm UTC](https://community.gatling.io/t/generate-reports-failed-sometimes/1081/2 "2014-06-06T15:02:32Z")

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Fun: there are some Exception messages that contain end-of-line characters…

javax.xml.bind.UnmarshalException

- with linked exception:  
[org.xml.sax.SAXException: FWK005 parse may not be called while parsing.]

I didn’t expect that we’d have to sanitize them… Will do.

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**Author:** ![Excilys](https://avatars.discourse-cdn.com/v4/letter/e/8797f3/32.png) [@Excilys](https://community.gatling.io/u/Excilys)\
**Post date:** [June 6, 2014, 3:49pm UTC](https://community.gatling.io/t/generate-reports-failed-sometimes/1081/3 "2014-06-06T15:49:50Z")

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Fixed, thanks for reporting!  
[https://github.com/excilys/gatling/issues/1947](https://github.com/excilys/gatling/issues/1947)

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**Author:** ![Excilys](https://avatars.discourse-cdn.com/v4/letter/e/8797f3/32.png) [@Excilys](https://community.gatling.io/u/Excilys)\
**Post date:** [June 6, 2014, 3:54pm UTC](https://community.gatling.io/t/generate-reports-failed-sometimes/1081/4 "2014-06-06T15:54:27Z")

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The error message gets me concerned: org.xml.sax.SAXException: FWK005 parse may not be called while parsing.

Do you have a stacktrace where this happens (might have to lower logging level).  
This is typically caused by a SAX parser being accessed from concurrent thread, but those are not thread safe.

Does this happens in Gatling or in some custom code of yours?

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**Author:** ![Cyril\_Souti](https://avatars.discourse-cdn.com/v4/letter/c/5daacb/32.png) [@Cyril\_Souti](https://community.gatling.io/u/Cyril_Souti)\
**Post date:** [June 6, 2014, 9:04pm UTC](https://community.gatling.io/t/generate-reports-failed-sometimes/1081/5 "2014-06-06T21:04:48Z")

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Yes, I think this error message comes from my custom code ☹  
Thanks for fix.

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<div class="post-metadata">

**Author:** ![Excilys](https://avatars.discourse-cdn.com/v4/letter/e/8797f3/32.png) [@Excilys](https://community.gatling.io/u/Excilys)\
**Post date:** [June 6, 2014, 9:12pm UTC](https://community.gatling.io/t/generate-reports-failed-sometimes/1081/6 "2014-06-06T21:12:54Z")

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You can have multiple SAX parser instances in a ThreadLocal as Gatling doesn’t use lots of threads.  
That’s what we do.