--- apache-sshd-2.7.0/sshd-core/src/main/java/org/apache/sshd/common/io/nio2/Nio2Session.java	2021-07-30 09:48:59.082251041 +0200
+++ apache-sshd-2.7.0/sshd-core/src/main/java/org/apache/sshd/common/io/nio2/Nio2Session.java	2021-07-30 09:54:40.568508196 +0200
@@ -353,13 +353,13 @@
                     log.trace("handleReadCycleCompletion({}) read {} bytes after {} nanos at cycle={}",
                             this, result, System.nanoTime() - lastReadCycleStart.get(), readCyclesCounter);
                 }
-                buffer.flip();
+                ((java.nio.Buffer)buffer).flip();
 
                 IoHandler handler = getIoHandler();
                 handler.messageReceived(this, bufReader);
                 if (!closeFuture.isClosed()) {
                     // re-use reference for next iteration since we finished processing it
-                    buffer.clear();
+                    ((java.nio.Buffer)buffer).clear();
                     doReadCycle(buffer, completionHandler);
                 } else {
                     if (debugEnabled) {
--- apache-sshd-2.7.0/sshd-sftp/src/main/java/org/apache/sshd/sftp/client/impl/SftpRemotePathChannel.java	2021-07-30 09:48:59.150251491 +0200
+++ apache-sshd-2.7.0/sshd-sftp/src/main/java/org/apache/sshd/sftp/client/impl/SftpRemotePathChannel.java	2021-07-30 09:54:40.572508221 +0200
@@ -21,6 +21,7 @@
 
 import java.io.IOException;
 import java.io.StreamCorruptedException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.MappedByteBuffer;
 import java.nio.channels.AsynchronousCloseException;
@@ -153,7 +154,7 @@
                         if (read > 0) {
                             // reference equality on purpose
                             if (wrap == buffer) {
-                                wrap.position(wrap.position() + read);
+                                ((Buffer)wrap).position(wrap.position() + read);
                             } else {
                                 buffer.put(wrap.array(), wrap.arrayOffset(), read);
                             }
@@ -258,7 +259,7 @@
                                 wrap.arrayOffset() + wrap.position(), written);
                         // reference equality on purpose
                         if (wrap == buffer) {
-                            wrap.position(wrap.position() + written);
+                            ((Buffer)wrap).position(wrap.position() + written);
                         }
                         curPos += written;
                         totalWritten += written;
--- apache-sshd-2.7.0/sshd-sftp/src/main/java/org/apache/sshd/sftp/server/AbstractSftpSubsystemHelper.java	2021-07-30 09:48:59.150251491 +0200
+++ apache-sshd-2.7.0/sshd-sftp/src/main/java/org/apache/sshd/sftp/server/AbstractSftpSubsystemHelper.java	2021-07-30 09:55:19.804767492 +0200
@@ -942,7 +942,7 @@
                     if (remainLen < digestBuf.length) {
                         bb = ByteBuffer.wrap(digestBuf, 0, remainLen);
                     }
-                    bb.clear(); // prepare for next read
+                    ((java.nio.Buffer)bb).clear(); // prepare for next read
 
                     int readLen = channel.read(bb);
                     if (readLen < 0) {
@@ -967,7 +967,7 @@
                     if (remainLen < digestBuf.length) {
                         bb = ByteBuffer.wrap(digestBuf, 0, remainLen);
                     }
-                    bb.clear(); // prepare for next read
+                    ((java.nio.Buffer)bb).clear(); // prepare for next read
 
                     int readLen = channel.read(bb);
                     if (readLen < 0) {
@@ -1101,7 +1101,7 @@
                     if (remainLen < digestBuf.length) {
                         bb = ByteBuffer.wrap(digestBuf, 0, remainLen);
                     }
-                    bb.clear(); // prepare for next read
+                    ((java.nio.Buffer)bb).clear(); // prepare for next read
 
                     int readLen = channel.read(bb);
                     if (readLen < 0) {