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https://issues.apache.org/jira/browse/LUCENE-7726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15891201#comment-15891201
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Uwe Schindler commented on LUCENE-7726:
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bq. I'm suprised the java8 javadocs/linter don't warn about this.
We don't have a full HTML validator involved. In addition, for HTML5, the
entity escaping _can_ be left out, if it is unambiguous. This mimics the
behavious most earlier browsers had (because most web devs out there did this
wrong). So the produced HTML is valid (HTML5) and also leads to no problems in
HTML4 browsers. But we should still fix it.
The requirement to escape also attributes is a requirement of just Java 9's
Javac (which is a bug from the HTML5 perspective, but a good thing, too).
> Fix Javadocs HTML entity bugs
> -----------------------------
>
> Key: LUCENE-7726
> URL: https://issues.apache.org/jira/browse/LUCENE-7726
> Project: Lucene - Core
> Issue Type: Bug
> Components: general/javadocs
> Reporter: Hoss Man
>
> As of jdk9-ea-b158, {{ant documentation}} seems to build the core javadocs
> just fine, but fails on the {{lucene/memory/}} javadocs...
> {noformat}
> javadocs:
> [mkdir] Created dir: /home/hossman/lucene/dev/lucene/build/docs/memory
> download-java8-javadoc-packagelist:
> [javadoc] Generating Javadoc
> [javadoc] Javadoc execution
> [javadoc] Loading source files for package org.apache.lucene.index.memory...
> [javadoc] Constructing Javadoc information...
> [javadoc] Standard Doclet version 9-ea
> [javadoc] Building tree for all the packages and classes...
> [javadoc] javadoc: warning - invalid usage of tag &pa
> [javadoc] javadoc: warning - invalid usage of tag &pid
> [javadoc] javadoc: warning - invalid usage of tag &page
> [javadoc] Building index for all the packages and classes...
> [javadoc] Building index for all classes...
> [javadoc] Generating
> /home/hossman/lucene/dev/lucene/build/docs/memory/help-doc.html...
> [javadoc] Note: Custom tags that were not seen: @lucene.internal
> [javadoc] 3 warnings
> BUILD FAILED
> /home/hossman/lucene/dev/build.xml:93: The following error occurred while
> executing this line:
> /home/hossman/lucene/dev/lucene/build.xml:251: The following error occurred
> while executing this line:
> /home/hossman/lucene/dev/lucene/common-build.xml:2179: The following error
> occurred while executing this line:
> /home/hossman/lucene/dev/lucene/module-build.xml:549: The following error
> occurred while executing this line:
> /home/hossman/lucene/dev/lucene/module-build.xml:65: The following error
> occurred while executing this line:
> /home/hossman/lucene/dev/lucene/module-build.xml:78: The following error
> occurred while executing this line:
> /home/hossman/lucene/dev/lucene/common-build.xml:2155: Javadocs warnings were
> found!
> Total time: 1 minute 0 seconds
> {noformat}
> looking at the generated html files turns up this...
> {noformat}
> hossman@tray:~/lucene/dev [master] $ find lucene/build/docs/memory -name
> \*.html | xargs grep -C5 "&pa"
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html- but
> rather thrown away immediately after tokenization.
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html- <p>
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html- For
> some interesting background information on search technology, see Bob Wyman's
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html- <a
> target="_blank"
> href="http://bobwyman.pubsub.com/main/2005/05/mary_hodder_poi.html";>Prospective
> Search</a>,
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html- Jim
> Gray's
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html: <a
> target="_blank"
> href="http://www.acmqueue.org/modules.php?name=Content&pa=showpage&pid=293&page=4";>
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html- A
> Call to Arms - Custom subscriptions</a>, and Tim Bray's
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html- <a
> target="_blank"
> href="http://www.tbray.org/ongoing/When/200x/2003/07/30/OnSearchTOC";>On
> Search, the Series</a>.
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html-
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html- <p>
> lucene/build/docs/memory/org/apache/lucene/index/memory/MemoryIndex.html-
> <b>Example Usage</b>
> {noformat}
> The source java file has this...
> {noformat}
> * Jim Gray's
> * <a target="_blank"
> href="http://www.acmqueue.org/modules.php?name=Content&pa=showpage&pid=293&page=4";>
> * A Call to Arms - Custom subscriptions</a>, and Tim Bray's
> {noformat}
> ...which does in fact seem to be invalid HTML ... aren't {{&}} always suppose
> to be encoded as {{&}} ... even in URLs?
> I'm suprised the java8 javadocs/linter don't warn about this.
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