remove java 21 warnings in jsch

files-jsch/src/main/java/com/jcraft/jsch/ChannelExec.java

@@ -34,6 +34,9 @@ public class ChannelExec extends ChannelSession {
 
   byte[] command = new byte[0];
 
+  public ChannelExec() {
+  }
+
   @Override
   public void start() throws JSchException {
     Session _session = getSession();

files-jsch/src/main/java/com/jcraft/jsch/ChannelSubsystem.java

@@ -34,6 +34,9 @@ public class ChannelSubsystem extends ChannelSession {
   boolean want_reply = true;
   String subsystem = "";
 
+  public ChannelSubsystem() {
+  }
+
   public void setWantReply(boolean foo) {
     want_reply = foo;
   }

files-jsch/src/main/java/com/jcraft/jsch/KeyExchange.java

@@ -69,6 +69,9 @@ public abstract class KeyExchange {
   protected byte[] H = null;
   protected byte[] K_S = null;
 
+  public KeyExchange() {
+  }
+
   public abstract void init(Session session, byte[] V_S, byte[] V_C, byte[] I_S, byte[] I_C)
       throws Exception;
 

files-jsch/src/main/java/com/jcraft/jsch/KeyPair.java

@@ -1238,12 +1238,6 @@ public abstract class KeyPair {
     Util.bzero(passphrase);
   }
 
-  @SuppressWarnings("deprecation")
-  @Override
-  public void finalize() {
-    dispose();
-  }
-
   static KeyPair loadPPK(JSch.InstanceLogger instLogger, byte[] buf) throws JSchException {
     byte[] pubkey = null;
     byte[] prvkey = null;

files-jsch/src/main/java/com/jcraft/jsch/Packet.java

@@ -26,7 +26,7 @@
 
 package com.jcraft.jsch;
 
-class Packet {
+public class Packet {
 
   private static Random random = null;
 
@@ -37,7 +37,7 @@ class Packet {
   Buffer buffer;
   byte[] ba4 = new byte[4];
 
-  Packet(Buffer buffer) {
+  public Packet(Buffer buffer) {
     this.buffer = buffer;
   }
 

files-jsch/src/main/java/com/jcraft/jsch/UserAuth.java

@@ -40,6 +40,9 @@ public abstract class UserAuth {
   protected Buffer buf;
   protected String username;
 
+  public UserAuth() {
+  }
+
   public boolean start(Session session) throws Exception {
     this.userinfo = session.getUserInfo();
     this.packet = session.packet;

files-jsch/src/main/java/com/jcraft/jsch/UserAuthNone.java

@@ -32,6 +32,9 @@ public class UserAuthNone extends UserAuth {
 
   private String methods;
 
+  public UserAuthNone() {
+  }
+
   @Override
   public boolean start(Session session) throws Exception {
     super.start(session);