Add support for newer Lucene versions without recompilation

h2/src/docsrc/html/build.html

@@ -116,7 +116,7 @@ build jarClient
 <h3>Using Apache Lucene</h3>
 <p>
 Apache Lucene 5.5.5 is used for testing.
-Newer versions may work, 7.5.0 was tested with recompiled under JDK 8 version.
+Newer versions up to 7.5.0 can also be used.
 </p>
 
 <h2 id="maven2">Using Maven 2</h2>

h2/src/docsrc/html/tutorial.html

@@ -1234,8 +1234,8 @@ org.h2.fulltext.FullText.searchData(conn, text, limit, offset);
 <h3>Using the Apache Lucene Fulltext Search</h3>
 <p>
 To use the Apache Lucene full text search, you need the Lucene library in the classpath.
-Currently, Apache Lucene 5.5.5 is used for testing.
-Newer versions may work, 7.5.0 was tested with recompiled under JDK 8 version.
+Apache Lucene 5.5.5 or later version up to 7.5.0 is required.
+Newer versions may also work, but were not tested.
 How to do that depends on the application; if you use the H2 Console, you can add the Lucene
 jar file to the environment variables <code>H2DRIVERS</code> or
 <code>CLASSPATH</code>.

h2/src/main/META-INF/MANIFEST.MF

@@ -41,14 +41,14 @@ Import-Package: javax.crypto,
  org.w3c.dom;resolution:=optional,
  org.xml.sax;resolution:=optional,
  org.xml.sax.helpers;resolution:=optional,
- org.apache.lucene.analysis;version="[5.5.5,6.0.0)";resolution:=optional,
- org.apache.lucene.analysis.standard;version="[5.5.5,6.0.0)";resolution:=optional,
- org.apache.lucene.document;version="[5.5.5,6.0.0)";resolution:=optional,
- org.apache.lucene.index;version="[5.5.5,6.0.0)";resolution:=optional,
- org.apache.lucene.queryparser;version="[5.5.5,6.0.0)";resolution:=optional,
- org.apache.lucene.search;version="[5.5.5,6.0.0)";resolution:=optional,
- org.apache.lucene.store;version="[5.5.5,6.0.0)";resolution:=optional,
- org.apache.lucene.util;version="[5.5.5,6.0.0)";resolution:=optional,
+ org.apache.lucene.analysis;version="[5.5.5,8.0.0)";resolution:=optional,
+ org.apache.lucene.analysis.standard;version="[5.5.5,8.0.0)";resolution:=optional,
+ org.apache.lucene.document;version="[5.5.5,8.0.0)";resolution:=optional,
+ org.apache.lucene.index;version="[5.5.5,8.0.0)";resolution:=optional,
+ org.apache.lucene.queryparser;version="[5.5.5,8.0.0)";resolution:=optional,
+ org.apache.lucene.search;version="[5.5.5,8.0.0)";resolution:=optional,
+ org.apache.lucene.store;version="[5.5.5,8.0.0)";resolution:=optional,
+ org.apache.lucene.util;version="[5.5.5,8.0.0)";resolution:=optional,
  org.locationtech.jts.geom;version="1.15.0";resolution:=optional,
  org.locationtech.jts.io;version="1.15.0";resolution:=optional,
  org.osgi.framework;version="1.5",

h2/src/main/org/h2/fulltext/FullTextLucene.java

@@ -38,11 +38,13 @@ import org.apache.lucene.search.TopDocs;
 import org.apache.lucene.store.Directory;
 import org.apache.lucene.store.FSDirectory;
 import org.apache.lucene.store.RAMDirectory;
+import org.h2.api.ErrorCode;
 import org.h2.api.Trigger;
 import org.h2.command.Parser;
 import org.h2.engine.Session;
 import org.h2.expression.ExpressionColumn;
 import org.h2.jdbc.JdbcConnection;
+import org.h2.message.DbException;
 import org.h2.store.fs.FileUtils;
 import org.h2.tools.SimpleResultSet;
 import org.h2.util.StatementBuilder;
@@ -75,6 +77,17 @@ public class FullTextLucene extends FullText {
      */
     private static final String IN_MEMORY_PREFIX = "mem:";
 
+    private static final java.lang.reflect.Field TOTAL_HITS;
+
+    static {
+        try {
+            TOTAL_HITS = TopDocs.class.getField("totalHits");
+        } catch (ReflectiveOperationException e) {
+            throw DbException.get(ErrorCode.GENERAL_ERROR_1, e,
+                    "Field org.apache.lucene.search.TopDocs.totalHits is not found");
+        }
+    }
+
     /**
      * Initializes full text search functionality for this database. This adds
      * the following Java functions to the database:
@@ -434,7 +447,7 @@ public class FullTextLucene extends FullText {
                     // TopDocs.totalHits is long now
                     // (https://issues.apache.org/jira/browse/LUCENE-7872)
                     // but in this context it's safe to cast
-                    limit = (int)docs.totalHits;
+                    limit = (int) TOTAL_HITS.getLong(docs);
                 }
                 for (int i = 0, len = docs.scoreDocs.length; i < limit
                         && i + offset < docs.totalHits