NPE from DefaultSearchEngine.doSearchWithCeiling
------------------------------------------------
Key: MINDEXER-44
URL: https://jira.codehaus.org/browse/MINDEXER-44
Project: Maven Indexer
Issue Type: Bug
Affects Versions: 4.1.1
Reporter: Jesse 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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