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https://issues.apache.org/jira/browse/LUCENE-3766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204660#comment-13204660
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Uwe Schindler commented on LUCENE-3766:
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As far as I remember this was because of Solr. Some tokenizers in Solr were
originally TokenStreams. After we restructured all of them, there is no reason
to keep default ctor or allow null at all.
> Remove/deprecate Tokenizer's default ctor
> -----------------------------------------
>
> Key: LUCENE-3766
> URL: https://issues.apache.org/jira/browse/LUCENE-3766
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Fix For: 3.6, 4.0
>
>
> I was working on a new Tokenizer... and I accidentally forgot to call
> super(input) (and super.reset(input) from my reset method)... which then
> meant my correctOffset() calls were silently a no-op; this is very trappy.
> Fortunately the awesome BaseTokenStreamTestCase caught this (I hit failures
> because the offsets were not in fact being corrected).
> One minimal thing we can do (but it sounds like from Robert there may be
> reasons why we can't) is add {{assert input != null}} in
> Tokenizer.correctOffset:
> {noformat}
> Index: lucene/core/src/java/org/apache/lucene/analysis/Tokenizer.java
> ===================================================================
> --- lucene/core/src/java/org/apache/lucene/analysis/Tokenizer.java
> (revision 1242316)
> +++ lucene/core/src/java/org/apache/lucene/analysis/Tokenizer.java
> (working copy)
> @@ -82,6 +82,7 @@
> * @see CharStream#correctOffset
> */
> protected final int correctOffset(int currentOff) {
> + assert input != null: "subclass failed to call super(Reader) or
> super.reset(Reader)";
> return (input instanceof CharStream) ? ((CharStream)
> input).correctOffset(currentOff) : currentOff;
> }
> {noformat}
> But best would be to remove the default ctor that leaves input null...
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