Lucene 3.6 IndexWriter

Question

Currently I'm working with Lucene 3.6 and am having difficulty getting IndexWriters to work.

The API documents suggest that:

IndexWriter writer = new IndexWriter(Directory, Analyzer);

(and a few other similar constructors)is depreciated and that I should use something like:

IndexWriter writer = new IndexWriter(Directory, Configuration);

However eclipse won't recognize this newer constructor (lucene-core3.6.jar is added to the build path of my project) and if I use an older constructor I have to suppress a warning (which I don't especially want to do - an exception gets thrown when I index in memory with these older methods).

I've cleaned the project, but the problem still persists.

EDIT: The code I am using:

        Directory index = new RAMDirectory();
    StandardAnalyzer analyzer = new StandardAnalyzer();
    IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_36, analyzer);
    IndexDeletionPolicy IndexDeletionPolicy = new KeepOnlyLastCommitDeletionPolicy();
    MaxFieldLength fieldLength = new MaxFieldLength(256);
    IndexWriter writer = new IndexWriter(index, analyzer, false, IndexDeletionPolicy, fieldLength);
    //IndexWriter writer = new IndexWriter(index, config); 
    writer.setUseCompoundFile(false);

Answer 1

A good beginning is always reading at the javadoc:

http://lucene.apache.org/core/3_6_0/api/all/index.html

Constructors

Constructor and Description

• IndexWriter(Directory d, Analyzer a, boolean create, IndexDeletionPolicy deletionPolicy, IndexWriter.MaxFieldLength mfl) Deprecated. use IndexWriter(Directory, IndexWriterConfig) instead

• IndexWriter(Directory d, Analyzer a, boolean create, IndexWriter.MaxFieldLength mfl) Deprecated. use IndexWriter(Directory, IndexWriterConfig) instead

• IndexWriter(Directory d, Analyzer a, IndexDeletionPolicy deletionPolicy, IndexWriter.MaxFieldLength mfl) Deprecated. use IndexWriter(Directory, IndexWriterConfig) instead

• IndexWriter(Directory d, Analyzer a, IndexDeletionPolicy deletionPolicy, IndexWriter.MaxFieldLength mfl, IndexCommit commit) Deprecated. use IndexWriter(Directory, IndexWriterConfig) instead

• IndexWriter(Directory d, Analyzer a, IndexWriter.MaxFieldLength mfl) Deprecated. use IndexWriter(Directory, IndexWriterConfig) instead

• IndexWriter(Directory d, IndexWriterConfig conf) Constructs a new IndexWriter per the settings given in conf.

Not suprisingly, you are using a deprecated constructor and Eclipse correctly emit a warning. If you use the last constructor, I am sure Eclipse won't emit a warning.

Answer 2

You might want to change:

StandardAnalyzer analyzer = new StandardAnalyzer();

to:

StandardAnalyzer analyzer = new StandardAnalyzer(Version.LUCENE_36);

The constructor of StandardAnalyzer takes a Version object. Perhaps Eclipse does not recognize the IndexWriter constructor because there is a compile-time error at an earlier line (ie when you try to create a new StandardAnalyzer).

Answer 3

I solved the problem:

There was a .jar file interfering with lucene (thirdparty-all.jar) which I found through looking at the stack trace. Removing the .jar removed problem.