我在 nutch-default.xml 中有配置 plugin.folders 但是当我通过 Eclipse 和 Netbeans 运行 Nutch 时，
Main class: org.apache.nutch.crawl.InjectorJob
Arguments: /MY_DATA_SOURCE/HR_PROJECTS/JSearch/Apache_Nutch/RELEASE/release-2.2.1/urls
VM Options: -Dhadoop.log.dir=logs -Dhadoop.log.file=hadoop.log
错误如下：
cd /MY_DATA_SOURCE/HR_PROJECTS/JSearch/Apache_Nutch/RELEASE/release-2.2.1; JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_25.jdk/Contents/Home "/Applications/NetBeans/NetBeans 7.3.app/Contents/Resources/NetBeans/java/maven/bin/mvn" "-Dexec.args=-Dhadoop.log.dir=logs -Dhadoop.log.file=hadoop.log -classpath %classpath org.apache.nutch.crawl.InjectorJob /MY_DATA_SOURCE/HR_PROJECTS/JSearch/Apache_Nutch/RELEASE/release-2.2.1/urls" -Dexec.executable=/Library/Java/JavaVirtualMachines/jdk1.7.0_25.jdk/Contents/Home/bin/java process-classes org.codehaus.mojo:exec-maven-plugin:1.2.1:exec
Scanning for projects...
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Building Apache Nutch 2.2.1
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[resources:resources]
[debug] execute contextualize
Using platform encoding (US-ASCII actually) to copy filtered resources, i.e. build is platform dependent!
skip non existing resourceDirectory /MY_DATA_SOURCE/HR_PROJECTS/JSearch/Apache_Nutch/RELEASE/release-2.2.1/src/main/resources
[compiler:compile]
Nothing to compile - all classes are up to date
[exec:exec]
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/Users/hung/.m2/repository/org/slf4j/slf4j-log4j12/1.6.1/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/hung/.m2/repository/org/slf4j/slf4j-jdk14/1.6.1/slf4j-jdk14-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/hung/.m2/repository/org/slf4j/slf4j-simple/1.6.1/slf4j-simple-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
13/07/06 08:55:18 INFO crawl.InjectorJob: InjectorJob: starting at 2013-07-06 08:55:18
13/07/06 08:55:18 INFO crawl.InjectorJob: InjectorJob: Injecting urlDir: /MY_DATA_SOURCE/HR_PROJECTS/JSearch/Apache_Nutch/RELEASE/release-2.2.1/urls
2013-07-06 08:55:18.420 java[1206:1c03] Unable to load realm info from SCDynamicStore
13/07/06 08:55:18 WARN store.DataStoreFactory: gora.properties not found, properties will be empty.
13/07/06 08:55:18 WARN store.DataStoreFactory: gora.properties not found, properties will be empty.
13/07/06 08:55:19 INFO crawl.InjectorJob: InjectorJob: Using class org.apache.gora.sql.store.SqlStore as the Gora storage class.
13/07/06 08:55:19 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
13/07/06 08:55:19 WARN mapred.JobClient: No job jar file set. User classes may not be found. See JobConf(Class) or JobConf#setJar(String).
13/07/06 08:55:19 INFO input.FileInputFormat: Total input paths to process : 1
13/07/06 08:55:19 WARN snappy.LoadSnappy: Snappy native library not loaded
13/07/06 08:55:19 INFO mapred.JobClient: Running job: job_local226390157_0001
13/07/06 08:55:19 INFO mapred.LocalJobRunner: Waiting for map tasks
13/07/06 08:55:19 INFO mapred.LocalJobRunner: Starting task: attempt_local226390157_0001_m_000000_0
13/07/06 08:55:19 INFO mapred.Task: Using ResourceCalculatorPlugin : null
13/07/06 08:55:19 INFO mapred.MapTask: Processing split: file:/MY_DATA_SOURCE/HR_PROJECTS/JSearch/Apache_Nutch/RELEASE/release-2.2.1/urls/seed.txt:0+20
13/07/06 08:55:19 WARN store.DataStoreFactory: gora.properties not found, properties will be empty.
13/07/06 08:55:19 INFO mapreduce.GoraRecordWriter: gora.buffer.write.limit = 10000
13/07/06 08:55:19 INFO mapred.LocalJobRunner: Map task executor complete.
13/07/06 08:55:19 WARN mapred.FileOutputCommitter: Output path is null in cleanup
13/07/06 08:55:19 WARN mapred.LocalJobRunner: job_local226390157_0001
java.lang.Exception: java.lang.IllegalArgumentException: plugin.folders is not defined
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:354)
Caused by: java.lang.IllegalArgumentException: plugin.folders is not defined
at org.apache.nutch.plugin.PluginManifestParser.parsePluginFolder(PluginManifestParser.java:78)
at org.apache.nutch.plugin.PluginRepository.<init>(PluginRepository.java:69)
at org.apache.nutch.plugin.PluginRepository.get(PluginRepository.java:97)
at org.apache.nutch.net.URLNormalizers.<init>(URLNormalizers.java:117)
at org.apache.nutch.crawl.InjectorJob$UrlMapper.setup(InjectorJob.java:99)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:364)
at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:223)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
13/07/06 08:55:20 INFO mapred.JobClient: map 0% reduce 0%
13/07/06 08:55:20 INFO mapred.JobClient: Job complete: job_local226390157_0001
13/07/06 08:55:20 INFO mapred.JobClient: Counters: 0
13/07/06 08:55:20 ERROR crawl.InjectorJob: InjectorJob: java.lang.RuntimeException: job failed: name=inject /MY_DATA_SOURCE/HR_PROJECTS/JSearch/Apache_Nutch/RELEASE/release-2.2.1/urls, jobid=job_local226390157_0001
at org.apache.nutch.util.NutchJob.waitForCompletion(NutchJob.java:54)
at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:233)
at org.apache.nutch.crawl.InjectorJob.inject(InjectorJob.java:251)
at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:273)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.nutch.crawl.InjectorJob.main(InjectorJob.java:282)
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BUILD FAILURE
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Total time: 6.572s
Finished at: Sat Jul 06 08:55:20 ICT 2013
Final Memory: 11M/236M
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Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:exec (default-cli) on project nutch: Command execution failed. Process exited with an error: 255 (Exit value: 255) -> [Help 1]
To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.
For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException