Program: 54537
Project: 54537
Buggy source:
private void cloneDatabases(@Nonnull MongoConnection remoteConnection) throws CloningException, MongoException {
  ListDatabasesReply databasesReply=remoteConnection.execute(ListDatabasesCommand.INSTANCE,"String_Node_Str",true,Empty.getInstance());
  CompletionService<?> completionService=new ExecutorCompletionService<>(ForkJoinPool.commonPool());
  for (  DatabaseEntry database : databasesReply.getDatabases()) {
    String databaseName=database.getName();
    if (isNotReplicable(databaseName)) {
      continue;
    }
    MyWritePermissionSupplier writePermissionSupplier=new MyWritePermissionSupplier(databaseName);
    CloneOptions options=new CloneOptions(true,false,true,false,databaseName,Collections.<String>emptySet(),writePermissionSupplier);
    completionService.submit(() -> {
      try (MongodConnection conn=server.openConnection();WriteMongodTransaction trans=conn.openWriteTransaction()){
        cloner.cloneDatabase(databaseName,remoteConnection,trans,options);
        trans.commit();
        return null;
      }
     }
);
  }
  for (  DatabaseEntry database : databasesReply.getDatabases()) {
    if (isNotReplicable(database.getName())) {
      continue;
    }
    try {
      completionService.take().get();
    }
 catch (    InterruptedException ex) {
      Thread.currentThread().interrupt();
      throw new CloningException("String_Node_Str",ex);
    }
catch (    ExecutionException ex) {
      if (ex.getCause() instanceof MongoException) {
        throw (MongoException)ex.getCause();
      }
 else {
        throw new CloningException("String_Node_Str",ex);
      }
    }
  }
}

Fixed version (ground truth):
private void cloneDatabases(@Nonnull MongoConnection remoteConnection) throws CloningException, MongoException {
  ListDatabasesReply databasesReply=remoteConnection.execute(ListDatabasesCommand.INSTANCE,"String_Node_Str",true,Empty.getInstance());
  CompletionService<?> completionService=new ExecutorCompletionService<>(ForkJoinPool.commonPool());
  for (  DatabaseEntry database : databasesReply.getDatabases()) {
    String databaseName=database.getName();
    if (isNotReplicable(databaseName)) {
      continue;
    }
    MyWritePermissionSupplier writePermissionSupplier=new MyWritePermissionSupplier(databaseName);
    CloneOptions options=new CloneOptions(true,false,true,false,databaseName,Collections.<String>emptySet(),writePermissionSupplier);
    completionService.submit(() -> {
      try (MongodConnection conn=server.openConnection();WriteMongodTransaction trans=conn.openWriteTransaction()){
        cloner.cloneDatabase(databaseName,remoteConnection,trans,options);
        trans.commit();
        return null;
      }
     }
);
  }
  for (  DatabaseEntry database : databasesReply.getDatabases()) {
    if (isNotReplicable(database.getName())) {
      continue;
    }
    try {
      completionService.take().get();
    }
 catch (    InterruptedException ex) {
      Thread.currentThread().interrupt();
      throw new CloningException("String_Node_Str",ex);
    }
catch (    ExecutionException ex) {
      Throwable cause=ex.getCause();
      if (cause instanceof MongoException) {
        throw (MongoException)cause;
      }
 else {
        throw new CloningException("String_Node_Str",ex);
      }
    }
  }
}