diff -urEbwB jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsBlock.java jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsBlock.java
--- jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsBlock.java	2021-03-09 22:10:22.000000000 +0100
+++ jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsBlock.java	2021-07-30 11:47:47.425624542 +0200
@@ -13,6 +13,7 @@
 package org.eclipse.jgit.internal.storage.dfs;
 
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.util.zip.CRC32;
 import java.util.zip.DataFormatException;
@@ -40,7 +41,7 @@
 
 	ByteBuffer zeroCopyByteBuffer(int n) {
 		ByteBuffer b = ByteBuffer.wrap(block);
-		b.position(n);
+		((Buffer)b).position(n);
 		return b;
 	}
 
diff -urEbwB jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java
--- jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java	2021-03-09 22:10:22.000000000 +0100
+++ jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java	2021-07-30 11:47:47.425624542 +0200
@@ -21,6 +21,7 @@
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.channels.Channels;
 import java.text.MessageFormat;
@@ -379,7 +380,7 @@
 
 			// Need to skip the 'PACK' header for the first read
 			int ptr = packHeadSkipped ? 0 : 12;
-			buf.position(0);
+			((Buffer)buf).position(0);
 			int bufLen = read(rc, buf);
 			if (bufLen <= ptr) {
 				throw packfileIsTruncated();
diff -urEbwB jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftable.java jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftable.java
--- jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftable.java	2021-03-09 22:10:22.000000000 +0100
+++ jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftable.java	2021-07-30 11:47:47.425624542 +0200
@@ -13,6 +13,7 @@
 import static org.eclipse.jgit.internal.storage.pack.PackExt.REFTABLE;
 
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 
 import org.eclipse.jgit.internal.storage.io.BlockSource;
@@ -102,7 +103,7 @@
 
 			byte[] dst = new byte[cnt];
 			ByteBuffer buf = ByteBuffer.wrap(dst);
-			buf.position(ctx.copy(file, pos, dst, 0, cnt));
+			((Buffer)buf).position(ctx.copy(file, pos, dst, 0, cnt));
 			return buf;
 		}
 
diff -urEbwB jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ByteBufferWindow.java jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ByteBufferWindow.java
--- jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ByteBufferWindow.java	2021-03-09 22:10:22.000000000 +0100
+++ jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ByteBufferWindow.java	2021-07-30 11:47:47.425624542 +0200
@@ -13,6 +13,7 @@
 package org.eclipse.jgit.internal.storage.file;
 
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.util.zip.DataFormatException;
 import java.util.zip.Inflater;
@@ -36,7 +37,7 @@
 	@Override
 	protected int copy(int p, byte[] b, int o, int n) {
 		final ByteBuffer s = buffer.slice();
-		s.position(p);
+		((Buffer)s).position(p);
 		n = Math.min(s.remaining(), n);
 		s.get(b, o, n);
 		return n;
@@ -46,7 +47,7 @@
 	void write(PackOutputStream out, long pos, int cnt)
 			throws IOException {
 		final ByteBuffer s = buffer.slice();
-		s.position((int) (pos - start));
+		((Buffer)s).position((int) (pos - start));
 
 		while (0 < cnt) {
 			byte[] buf = out.getCopyBuffer();
@@ -62,7 +63,7 @@
 	protected int setInput(int pos, Inflater inf)
 			throws DataFormatException {
 		final ByteBuffer s = buffer.slice();
-		s.position(pos);
+		((Buffer)s).position(pos);
 		final byte[] tmp = new byte[Math.min(s.remaining(), 512)];
 		s.get(tmp, 0, tmp.length);
 		inf.setInput(tmp, 0, tmp.length);
diff -urEbwB jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java
--- jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java	2021-03-09 22:10:22.000000000 +0100
+++ jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java	2021-07-30 11:47:47.425624542 +0200
@@ -31,6 +31,7 @@
 import static org.eclipse.jgit.lib.Ref.Storage.PACKED;
 
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.util.Arrays;
 import java.util.zip.DataFormatException;
@@ -272,7 +273,7 @@
 			buf = b.array();
 		} else {
 			buf = new byte[bufLen];
-			b.flip();
+			((Buffer)b).flip();
 			b.get(buf);
 		}
 		endPosition = pos + bufLen;
diff -urEbwB jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java
--- jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java	2021-03-09 22:10:22.000000000 +0100
+++ jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java	2021-07-30 11:47:47.425624542 +0200
@@ -23,6 +23,7 @@
 import static org.eclipse.jgit.lib.Constants.OBJECT_ID_LENGTH;
 
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.text.MessageFormat;
 import java.util.Arrays;
@@ -341,7 +342,7 @@
 		}
 
 		byte[] tmp = new byte[len];
-		buf.flip();
+		((Buffer)buf).flip();
 		buf.get(tmp);
 		if (!isFileHeaderMagic(tmp, 0, len)) {
 			throw new IOException(JGitText.get().invalidReftableFile);
@@ -408,7 +409,7 @@
 			buf = tmp.array();
 		} else {
 			buf = new byte[sz];
-			tmp.flip();
+			((Buffer)tmp).flip();
 			tmp.get(buf);
 		}
 		if (pos == 0 && buf[FILE_HEADER_LEN] == FILE_BLOCK_TYPE) {
diff -urEbwB jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefAdvertiser.java jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefAdvertiser.java
--- jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefAdvertiser.java	2021-03-09 22:10:22.000000000 +0100
+++ jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefAdvertiser.java	2021-07-30 11:47:47.425624542 +0200
@@ -17,6 +17,7 @@
 import static org.eclipse.jgit.transport.GitProtocolConstants.REF_ATTR_SYMREF_TARGET;
 
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.CharBuffer;
 import java.nio.charset.CharacterCodingException;
@@ -67,7 +68,7 @@
 				throws IOException {
 			id.copyTo(binArr, 0);
 			binArr[OBJECT_ID_STRING_LENGTH] = ' ';
-			binBuf.position(OBJECT_ID_STRING_LENGTH + 1);
+			((Buffer)binBuf).position(OBJECT_ID_STRING_LENGTH + 1);
 			append(refName);
 			if (first) {
 				first = false;
@@ -90,7 +91,7 @@
 				chBuf = CharBuffer.wrap(chArr);
 			}
 			str.getChars(0, n, chArr, 0);
-			chBuf.position(0).limit(n);
+			((Buffer)chBuf).position(0).limit(n);
 			utf8.reset();
 			for (;;) {
 				CoderResult cr = utf8.encode(chBuf, binBuf, true);
@@ -117,7 +118,7 @@
 			System.arraycopy(binArr, 0, tmp, 0, cnt);
 			binArr = tmp;
 			binBuf = ByteBuffer.wrap(binArr);
-			binBuf.position(cnt);
+			((Buffer)binBuf).position(cnt);
 		}
 
 		@Override
diff -urEbwB jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/util/RawParseUtils.java jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/util/RawParseUtils.java
--- jgit-5.11.0.202103091610-r/org.eclipse.jgit/src/org/eclipse/jgit/util/RawParseUtils.java	2021-03-09 22:10:22.000000000 +0100
+++ jgit-5.11.0.202103091610-r.new/org.eclipse.jgit/src/org/eclipse/jgit/util/RawParseUtils.java	2021-07-30 11:47:47.425624542 +0200
@@ -18,6 +18,7 @@
 import static org.eclipse.jgit.lib.ObjectChecker.encoding;
 import static org.eclipse.jgit.lib.ObjectChecker.tagger;
 
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.charset.CharacterCodingException;
 import java.nio.charset.Charset;
@@ -1137,7 +1138,7 @@
 			final byte[] buffer, final int start, final int end)
 			throws CharacterCodingException {
 		ByteBuffer b = ByteBuffer.wrap(buffer, start, end - start);
-		b.mark();
+		((Buffer)b).mark();
 
 		// Try our built-in favorite. The assumption here is that
 		// decoding will fail if the data is not actually encoded
@@ -1145,7 +1146,7 @@
 		try {
 			return decode(b, UTF_8);
 		} catch (CharacterCodingException e) {
-			b.reset();
+			((Buffer)b).reset();
 		}
 
 		if (!cs.equals(UTF_8)) {
@@ -1154,7 +1155,7 @@
 			try {
 				return decode(b, cs);
 			} catch (CharacterCodingException e) {
-				b.reset();
+				((Buffer)b).reset();
 			}
 		}
 
@@ -1165,7 +1166,7 @@
 			try {
 				return decode(b, defcs);
 			} catch (CharacterCodingException e) {
-				b.reset();
+				((Buffer)b).reset();
 			}
 		}
 
diff -urEbwB jgit-5.11.0.202103091610-r/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/ObjectDownloadListener.java jgit-5.11.0.202103091610-r.new/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/ObjectDownloadListener.java
--- jgit-5.11.0.202103091610-r/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/ObjectDownloadListener.java	2021-03-09 22:10:22.000000000 +0100
+++ jgit-5.11.0.202103091610-r.new/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/ObjectDownloadListener.java	2021-07-30 11:47:47.425624542 +0200
@@ -10,6 +10,7 @@
 package org.eclipse.jgit.lfs.server.fs;
 
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
@@ -85,11 +86,11 @@
 	public void onWritePossible() throws IOException {
 		while (out.isReady()) {
 			try {
-				buffer.clear();
+				((Buffer)buffer).clear();
 				if (in.read(buffer) < 0) {
 					buffer = null;
 				} else {
-					buffer.flip();
+					((Buffer)buffer).flip();
 				}
 			} catch (Throwable t) {
 				LOG.log(Level.SEVERE, t.getMessage(), t);
diff -urEbwB jgit-5.11.0.202103091610-r/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/ObjectUploadListener.java jgit-5.11.0.202103091610-r.new/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/ObjectUploadListener.java
--- jgit-5.11.0.202103091610-r/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/ObjectUploadListener.java	2021-03-09 22:10:22.000000000 +0100
+++ jgit-5.11.0.202103091610-r.new/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/ObjectUploadListener.java	2021-07-30 11:47:47.425624542 +0200
@@ -11,6 +11,7 @@
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
@@ -131,11 +132,11 @@
 	public void onDataAvailable() throws IOException {
 		while (in.isReady()) {
 			if (inChannel.read(buffer) > 0) {
-				buffer.flip();
+				((Buffer)buffer).flip();
 				uploaded += Integer.valueOf(channel.write(buffer)).longValue();
 				buffer.compact();
 			} else {
-				buffer.flip();
+				((Buffer)buffer).flip();
 				while (buffer.hasRemaining()) {
 					uploaded += Integer.valueOf(channel.write(buffer))
 							.longValue();