Ted Dunning created MAHOUT-1006:
-----------------------------------
Summary: Example from book no longer works - prepare20newsgroups
broken with Lucene upgrade
Key: MAHOUT-1006
URL: https://issues.apache.org/jira/browse/MAHOUT-1006
Project: Mahout
Issue Type: Bug
Affects Versions: 0.7
Reporter: Ted Dunning
Assignee: Ted Dunning
Priority: Critical
Fix For: 0.7
The StandardAnalyzer from Lucene no longer has a no-args constructor. Our code
uses reflection to create this class, but looks for a no-args constructor and
that causes this:
{code}
./bin/mahout prepare20newsgroups -p 20news-bydate-train/ -o 20news-train/ -a
org.apache.lucene.analysis.standard.StandardAnalyzer -c UTF-8
MAHOUT_LOCAL is not set; adding HADOOP_CONF_DIR to classpath.
no HADOOP_HOME set, running locally
Unable to find a $JAVA_HOME at "/usr", continuing with system-provided Java...
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in
[jar:file:/Users/hadoop/mahout/examples/target/mahout-examples-0.7-SNAPSHOT-job.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in
[jar:file:/Users/hadoop/mahout/examples/target/dependency/slf4j-jcl-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in
[jar:file:/Users/hadoop/mahout/examples/target/dependency/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
Exception in thread "main" java.lang.IllegalStateException:
java.lang.NoSuchMethodException:
org.apache.lucene.analysis.standard.StandardAnalyzer.<init>()
at org.apache.mahout.common.ClassUtils.instantiateAs(ClassUtils.java:68)
at org.apache.mahout.common.ClassUtils.instantiateAs(ClassUtils.java:28)
at
org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups.main(PrepareTwentyNewsgroups.java:89)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:188)
Caused by: java.lang.NoSuchMethodException:
org.apache.lucene.analysis.standard.StandardAnalyzer.<init>()
at java.lang.Class.getConstructor0(Class.java:2706)
at java.lang.Class.getConstructor(Class.java:1657)
at org.apache.mahout.common.ClassUtils.instantiateAs(ClassUtils.java:62)
... 9 more
{code}
This is really bad.
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