我正在使用Nutch 1.12和Apache Solr 6.2.1。 我使用nutch抓住了网址，他们的工作非常好。 但是，当我尝试将Nutch与Solr集成时，就出现了问题。
我使用了以下命令
bin / nutch index http://localhost:8983/solr/testcore crawl / crawldb / -linkdb crawl / linkdb / crawl / segments / 20161123164547 / -filter -normalize -deleteGone
The input path at crawldb is not a segment... skipping
Segment dir is complete: crawl/segments/20161123164547.
Indexer: starting at 2016-11-23 20:16:43
Indexer: deleting gone documents: true
Indexer: URL filtering: true
Indexer: URL normalizing: true
Active IndexWriters :
SOLRIndexWriter
solr.server.url : URL of the SOLR instance
solr.zookeeper.hosts : URL of the Zookeeper quorum
solr.commit.size : buffer size when sending to SOLR (default 1000)
solr.mapping.file : name of the mapping file for fields (default solrindex-mapping.xml)
solr.auth : use authentication (default false)
solr.auth.username : username for authentication
solr.auth.password : password for authentication
Indexer: java.lang.NullPointerException
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1012)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:445)
at org.apache.hadoop.util.Shell.run(Shell.java:418)
at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:650)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:739)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:722)
at org.apache.hadoop.fs.FileUtil.execCommand(FileUtil.java:1097)
at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.loadPermissionInfo( RawLocalFileSystem.java:559)
at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.getPermission(RawLo calFileSystem.java:534)
at org.apache.hadoop.fs.LocatedFileStatus.<init>(LocatedFileStatus.java:42)
at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1697)
at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1679)
at org.apache.hadoop.mapred.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:2 68)
at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:228)
at org.apache.hadoop.mapred.SequenceFileInputFormat.listStatus(SequenceFileInputFormat.java :45)
at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:304)
at org.apache.hadoop.mapreduce.JobSubmitter.writeOldSplits(JobSubmitter.java:520)
at org.apache.hadoop.mapreduce.JobSubmitter.writeSplits(JobSubmitter.java:512)
at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:394)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1285)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1282)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:1282)
at org.apache.hadoop.mapred.JobClient$1.run(JobClient.java:562)
at org.apache.hadoop.mapred.JobClient$1.run(JobClient.java:557)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:557)
at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:548)
at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:833)
at org.apache.nutch.indexer.IndexingJob.index(IndexingJob.java:145)
at org.apache.nutch.indexer.IndexingJob.run(IndexingJob.java:228)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.nutch.indexer.IndexingJob.main(IndexingJob.java:237)