java.io.InvalidClassException on updating to Epic 0.3 and using POS tagger

[malcolmgreaves]

I upgraded a project I had to use Epic 0.3 and the most recent taggers and parsers. I'm getting a pretty nasty error here:

[info]   java.io.InvalidClassException: breeze.linalg.Counter2$$anon$1; local class incompatible: stream classdesc serialVersionUID = -8653601685403516672, local class serialVersionUID = 6118148492784004600
...
[info]   at epic.models.PosTagSelector$.loadTagger(PosTagModelLoader.scala:13)

(full stacktrace below)

It looks like there's a problem in breeze.lingalg.Counter. Did the API possibly change between this upgrade? Perhaps it's related to the fact that I'm using Spark as well as Epic in my project? Here are all of my dependencies

"org.scalanlp" %% "epic" % "0.3",
"org.scalanlp" %% "epic-parser-en-span" % "2015.1.25",
"org.scalanlp" %% "epic-ner-en-conll" % "2015.1.25",
"org.scalanlp" %% "epic-pos-en" % "2015.1.25",
"org.apache.spark" % "spark-core_2.10" % "1.3.0",
"org.apache.spark" % "spark-mllib_2.10" % "1.3.0",

Stacktrace:

[info]   java.io.InvalidClassException: breeze.linalg.Counter2$$anon$1; local class incompatible: stream classdesc serialVersionUID = -8653601685403516672, local class serialVersionUID = 6118148492784004600
[info]   at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:621)
[info]   at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1623)
[info]   at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
[info]   at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1707)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1345)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
[info]   at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
[info]   at epic.models.ClassPathModelLoader.load(ModelLoader.scala:23)
[info]   at epic.models.DelegatingLoader.load(ModelLoader.scala:33)
[info]   at epic.models.PosTagSelector$.loadTagger(PosTagModelLoader.scala:13)

[reactormonk]

Are you using scala 2.10? If yes, then this is a duplicate of #26

[malcolmgreaves]

I am indeed using 2.10 ! Thanks for catching this. I'll close and post on #26