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https://issues.apache.org/jira/browse/MINDEXER-44?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17965250#comment-17965250
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Olivier Lamy commented on MINDEXER-44:
--------------------------------------
This project has moved from Jira to GitHub Issues. This issue was migrated to
[apache/maven-indexer#461|https://github.com/apache/maven-indexer/issues/461].
> NPE from DefaultSearchEngine.doSearchWithCeiling
> ------------------------------------------------
>
> Key: MINDEXER-44
> URL: https://issues.apache.org/jira/browse/MINDEXER-44
> Project: Maven Indexer (Moved to GitHub Issues)
> Issue Type: Bug
> Affects Versions: 4.1.1
> Reporter: Jesse N. Glick
> Priority: Minor
>
> http://netbeans.org/bugzilla/show_bug.cgi?id=202138 reports
> http://statistics.netbeans.org/exceptions/messageslog?id=533660 which shows
> {code}
> java.lang.NullPointerException
> at
> org.apache.maven.index.DefaultSearchEngine.doSearchWithCeiling(DefaultSearchEngine.java:316)
> at
> org.apache.maven.index.DefaultSearchEngine.searchFlat(DefaultSearchEngine.java:169)
> at
> org.apache.maven.index.DefaultSearchEngine.searchFlatPaged(DefaultSearchEngine.java:102)
> at
> org.apache.maven.index.DefaultSearchEngine.searchFlatPaged(DefaultSearchEngine.java:77)
> {code}
> This comes after some index download problems like
> {code}
> java.io.FileNotFoundException: Resource nexus-maven-repository-index.gz does
> not exist
> at
> org.apache.maven.index.updater.WagonHelper$WagonFetcher.retrieve(WagonHelper.java:196)
> at
> org.apache.maven.index.updater.WagonHelper$WagonFetcher.retrieve(WagonHelper.java:166)
> at
> org.apache.maven.index.updater.DefaultIndexUpdater.loadIndexDirectory(DefaultIndexUpdater.java:191)
> at
> org.apache.maven.index.updater.DefaultIndexUpdater.access$300(DefaultIndexUpdater.java:76)
> at
> org.apache.maven.index.updater.DefaultIndexUpdater$LuceneIndexAdaptor.setIndexFile(DefaultIndexUpdater.java:642)
> at
> org.apache.maven.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:861)
> at
> org.apache.maven.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:157)
> {code}
> It seems that the {{DefaultIndexingContext.indexSearcher}} is null, for
> whatever reason, and {{searchFlatPaged}} is not verifying that it has been
> passed a valid context and does not attempt to fix an invalid context,
> perhaps using {{openAndWarmupReaders}}.
> Probably the caller is at fault for attempting a search on a context with no
> valid index, but this ought to be reported more clearly than with an NPE
> several calls down the stack, and there should be some documented method for
> checking that a context is somehow complete and ready for use.
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