obligatory ssh client close()

files-sftp-fs/src/main/java/org/apache/sshd/fs/spi/SFTPContext.java

@@ -37,6 +37,7 @@ public class SFTPContext implements Closeable {
     @Override
     public void close() throws IOException {
         sshClient.stop();
+        sshClient.close();
         fileSystem.close();
     }
 }

files-sftp-fs/src/main/java/org/apache/sshd/fs/spi/SFTPFileService.java

@@ -472,8 +472,4 @@ public class SFTPFileService implements FileService {
             }
         }
     }
-
-    private <T> T performWithoutClose(SFTPContext ctx, WithContext<T> action) throws IOException {
-        return action.perform(ctx);
-    }
 }

files-sftp-fs/src/test/java/org/apache/sshd/fs/test/FileServiceProviderTest.java

@@ -1,18 +1,26 @@
 package org.apache.sshd.fs.test;
 
+import java.nio.file.Path;
+import java.util.stream.Stream;
 import org.junit.jupiter.api.Test;
 import org.xbib.files.FileService;
 
-import java.io.IOException;
 import java.util.Map;
 import java.util.logging.Logger;
 
 public class FileServiceProviderTest {
 
     @Test
-    public void testSFTP() throws IOException {
+    public void testSFTP() throws Exception {
         Map<String, ?> env = Map.of("username", "joerg");
         FileService fs = FileService.newInstance("sftp://alkmene:22", env);
-        fs.list(".").forEach(p -> Logger.getAnonymousLogger().info(p.toString()));
+        // close() is essential!
+        try (Stream<Path> list = fs.list(".")) {
+            list.forEach(p -> Logger.getAnonymousLogger().info(p.toString()));
+        }
+        // see if a second run still works
+        try (Stream<Path> list = fs.list(".")) {
+            list.forEach(p -> Logger.getAnonymousLogger().info(p.toString()));
+        }
     }
 }

files-sftp-fs/src/test/java/org/apache/sshd/fs/test/SFTPFileSystemTest.java

@@ -37,5 +37,6 @@ public class SFTPFileSystemTest {
         fileSystem.close();
         // ...
         sshClient.stop();
+        sshClient.close();
     }
 }

files-sftp/src/main/java/org/apache/sshd/client/SshClient.java

@@ -652,7 +652,7 @@ public class SshClient extends AbstractFactoryManager implements ClientFactoryMa
     protected SshFutureListener<IoConnectFuture> createConnectCompletionListener(
             ConnectFuture connectFuture, String username, SocketAddress address,
             KeyIdentityProvider identities, boolean useDefaultIdentities) {
-        return new SshFutureListener<IoConnectFuture>() {
+        return new SshFutureListener<>() {
             @Override
             @SuppressWarnings("synthetic-access")
             public void operationComplete(IoConnectFuture future) {
@@ -660,7 +660,6 @@ public class SshClient extends AbstractFactoryManager implements ClientFactoryMa
                     connectFuture.cancel();
                     return;
                 }
-
                 Throwable t = future.getException();
                 if (t != null) {
                     connectFuture.setException(t);

files-sftp/src/main/java/org/apache/sshd/common/Closeable.java

@@ -20,7 +20,6 @@ package org.apache.sshd.common;
 
 import java.io.IOException;
 import java.net.SocketTimeoutException;
-import java.nio.channels.Channel;
 import java.time.Duration;
 
 import org.apache.sshd.common.future.CloseFuture;

gradle.properties

@@ -1,3 +1,3 @@
 group = org.xbib
 name = files
-version = 4.4.0
+version = 4.5.0