Error Enable Feed Plugin

Wed, 27 Jul 2016 03:43:54 -0700 

Dear All,
I have a problem when enable "feed" plugins at Apache Nutch 2.3.1. I tried to modify lines in ${NUTCH_HOME}/src/plugin/build.xml and ${NUTCH_HOME}/build.xml but it doesnt work. 

The following is error :

resolve-default:

[ivy:resolve] :: loading settings :: file = 
/home/hduser/feed/apache-nutch-2.3.1/ivy/ivysettings.xml


compile:
     [echo] Compiling plugin: feed

    [javac] Compiling 4 source files to 
/home/hduser/feed/apache-nutch-2.3.1/build/feed/classes
    [javac] 
/home/hduser/feed/apache-nutch-2.3.1/src/plugin/feed/src/java/org/apache/nutch/indexer/feed/FeedIndexingFilter.java:71: 
error: cannot find symbol
    [javac]   public NutchDocument filter(NutchDocument doc, Parse 
parse, Text url, CrawlDatum datum,

[javac] ^
    [javac]   symbol:   class CrawlDatum
    [javac]   location: class FeedIndexingFilter

    [javac] 
/home/hduser/feed/apache-nutch-2.3.1/src/plugin/feed/src/java/org/apache/nutch/indexer/feed/FeedIndexingFilter.java:72: 
error: cannot find symbol
    [javac]                          Inlinks inlinks) throws 
IndexingException {

    [javac]                          ^
    [javac]   symbol:   class Inlinks
    [javac]   location: class FeedIndexingFilter

    [javac] 
/home/hduser/feed/apache-nutch-2.3.1/src/plugin/feed/src/java/org/apache/nutch/parse/feed/FeedParser.java:102: 
error: cannot find symbol

    [javac]   public ParseResult getParse(Content content) {
    [javac]          ^
    [javac]   symbol:   class ParseResult
    [javac]   location: class FeedParser

    [javac] 
/home/hduser/feed/apache-nutch-2.3.1/src/plugin/feed/src/java/org/apache/nutch/parse/feed/FeedParser.java:217: 
error: cannot find symbol

    [javac]   private void addToMap(ParseResult parseResult, SyndFeed feed,
    [javac]                         ^
    [javac]   symbol:   class ParseResult
    [javac]   location: class FeedParser

    [javac] 
/home/hduser/feed/apache-nutch-2.3.1/src/plugin/feed/src/java/org/apache/nutch/indexer/feed/FeedIndexingFilter.java:46: 
error: FeedIndexingFilter is not abstract and does not override abstract 
method filter(NutchDocument,String,WebPage) in IndexingFilter

    [javac] public class FeedIndexingFilter implements IndexingFilter {
    [javac]        ^

    [javac] 
/home/hduser/feed/apache-nutch-2.3.1/src/plugin/feed/src/java/org/apache/nutch/indexer/feed/FeedIndexingFilter.java:73: 
error: cannot find symbol

 [javac]     ParseData parseData = parse.getData();
    [javac]     ^
    [javac]   symbol:   class ParseData
    [javac]   location: class FeedIndexingFilter

Thank you for helping me.
Regards.
















    











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