Add missing copyright headels and javadoc

h2/src/main/org/h2/jdbc/JdbcClob.java

@@ -262,6 +262,10 @@ public class JdbcClob extends TraceObject implements NClob
 
     /**
      * Returns the reader, starting from an offset.
+     *
+     * @param pos 1-based offset
+     * @param length length of requested area
+     * @return the reader
      */
     @Override
     public Reader getCharacterStream(long pos, long length) throws SQLException {

h2/src/main/org/h2/store/RangeInputStream.java

+/*
+ * Copyright 2004-2018 H2 Group. Multiple-Licensed under the MPL 2.0,
+ * and the EPL 1.0 (http://h2database.com/html/license.html).
+ * Initial Developer: H2 Group
+ */
 package org.h2.store;
 
 import java.io.FilterInputStream;
@@ -6,9 +11,24 @@ import java.io.InputStream;
 
 import org.h2.util.IOUtils;
 
+/**
+ * Input stream that reads only a specified range from the source stream.
+ */
 public final class RangeInputStream extends FilterInputStream {
     private long limit;
 
+    /**
+     * Creates new instance of range input stream.
+     *
+     * @param in
+     *            source stream
+     * @param offset
+     *            offset of the range
+     * @param limit
+     *            length of the range
+     * @throws IOException
+     *             on I/O exception during seeking to the specified offset
+     */
     public RangeInputStream(InputStream in, long offset, long limit) throws IOException {
         super(in);
         this.limit = limit;

h2/src/main/org/h2/store/RangeReader.java

+/*
+ * Copyright 2004-2018 H2 Group. Multiple-Licensed under the MPL 2.0,
+ * and the EPL 1.0 (http://h2database.com/html/license.html).
+ * Initial Developer: H2 Group
+ */
 package org.h2.store;
 
 import java.io.IOException;
@@ -5,11 +10,26 @@ import java.io.Reader;
 
 import org.h2.util.IOUtils;
 
+/**
+ * Reader that reads only a specified range from the source reader.
+ */
 public final class RangeReader extends Reader {
     private final Reader r;
 
     private long limit;
 
+    /**
+     * Creates new instance of range reader.
+     *
+     * @param r
+     *            source reader
+     * @param offset
+     *            offset of the range
+     * @param limit
+     *            length of the range
+     * @throws IOException
+     *             on I/O exception during seeking to the specified offset
+     */
     public RangeReader(Reader r, long offset, long limit) throws IOException {
         this.r = r;
         this.limit = limit;