diff --git a/haas-imagej-client/src/main/java/cz/it4i/fiji/haas/Job.java b/haas-imagej-client/src/main/java/cz/it4i/fiji/haas/Job.java
index be2e402207a2bc1e75f961dad4f275ee0f9f580b..cebf0413a7105738a3f1efa9e52b6117f5fcfc50 100644
--- a/haas-imagej-client/src/main/java/cz/it4i/fiji/haas/Job.java
+++ b/haas-imagej-client/src/main/java/cz/it4i/fiji/haas/Job.java
@@ -32,6 +32,7 @@ import cz.it4i.fiji.haas_java_client.JobState;
 import cz.it4i.fiji.haas_java_client.ProgressNotifier;
 import cz.it4i.fiji.haas_java_client.TransferFileProgressForHaaSClient;
 import cz.it4i.fiji.haas_java_client.UploadingFile;
+import cz.it4i.fiji.haas_java_client.UploadingFileData;
 import cz.it4i.fiji.scpclient.TransferFileProgress;
 
 /***
@@ -484,4 +485,10 @@ public class Job {
 		setProperty(JOB_CAN_BE_DOWNLOADED, b);
 	}
 
+	public void createEmptyFile(String fileName) throws InterruptedIOException {
+		try(HaaSFileTransfer transfer = haasClientSupplier.get().startFileTransfer(getId())) {
+			transfer.upload(new UploadingFileData(fileName));
+		}
+	}
+
 }
diff --git a/haas-java-client/src/main/java/cz/it4i/fiji/haas_java_client/UploadingFileData.java b/haas-java-client/src/main/java/cz/it4i/fiji/haas_java_client/UploadingFileData.java
new file mode 100644
index 0000000000000000000000000000000000000000..20dbab9975af5e56ded16724ba7ad01b08091397
--- /dev/null
+++ b/haas-java-client/src/main/java/cz/it4i/fiji/haas_java_client/UploadingFileData.java
@@ -0,0 +1,42 @@
+package cz.it4i.fiji.haas_java_client;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class UploadingFileData implements UploadingFile {
+
+	private final byte[] data;
+	private final String name;
+	
+	
+	public UploadingFileData(String name, byte[] data) {
+		this.data = data;
+		this.name = name;
+	}
+
+	public UploadingFileData(String string) {
+		this(string, new byte[0]);
+	}
+
+	@Override
+	public InputStream getInputStream() {
+		return new ByteArrayInputStream(data);
+	}
+
+	@Override
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public long getLength() throws IOException {
+		return data.length;
+	}
+
+	@Override
+	public long getLastTime() {
+		return 0;
+	}
+
+}
diff --git a/haas-java-client/src/test/java/cz/it4i/fiji/haas_java_client/TestHaaSJavaClient.java b/haas-java-client/src/test/java/cz/it4i/fiji/haas_java_client/TestHaaSJavaClient.java
index 6adb39da9d45081acb12fc4e7747e0872f12f7ee..09e02548ab1cc34e239478f0ab9ea37f1dc376fb 100644
--- a/haas-java-client/src/test/java/cz/it4i/fiji/haas_java_client/TestHaaSJavaClient.java
+++ b/haas-java-client/src/test/java/cz/it4i/fiji/haas_java_client/TestHaaSJavaClient.java
@@ -36,7 +36,7 @@ public class TestHaaSJavaClient {
 		JobInfo info;
 		do {
 			try {
-				Thread.sleep(30000);
+				Thread.sleep(1000);
 			} catch (InterruptedException e) {
 				e.printStackTrace();
 			}
@@ -52,7 +52,7 @@ public class TestHaaSJavaClient {
 					client.getChangedFiles(jobId).forEach(file -> wrap(() -> fileTransfer.download(file, workDir)));
 				}
 			}
-			log.info("JobId :" + jobId + ", state" + info.getState());
+			log.info("JobId :" + jobId + ", state - " + info.getState());
 		} while (info.getState() != JobState.Canceled && info.getState() != JobState.Failed
 				&& info.getState() != JobState.Finished);
 	}
diff --git a/haas-spim-benchmark/src/main/java/cz/it4i/fiji/haas_spim_benchmark/core/BenchmarkJobManager.java b/haas-spim-benchmark/src/main/java/cz/it4i/fiji/haas_spim_benchmark/core/BenchmarkJobManager.java
index 1a119a54ecefba0003f64dbcb85c12f8e6e3d0cf..26cb12a9d9275145394745af61ac028f6541a3d3 100644
--- a/haas-spim-benchmark/src/main/java/cz/it4i/fiji/haas_spim_benchmark/core/BenchmarkJobManager.java
+++ b/haas-spim-benchmark/src/main/java/cz/it4i/fiji/haas_spim_benchmark/core/BenchmarkJobManager.java
@@ -536,6 +536,9 @@ public class BenchmarkJobManager implements Closeable {
 	public BenchmarkJob createJob(Function<Path, Path> inputDirectoryProvider,
 			Function<Path, Path> outputDirectoryProvider) throws IOException {
 		Job job = jobManager.createJob( getJobSettings(),inputDirectoryProvider, outputDirectoryProvider);
+		if(job.getInputDirectory() == null) {
+			job.createEmptyFile(Constants.DEMO_DATA_SIGNAL_FILE_NAME);
+		}
 		return convertJob(job);
 	}
 
diff --git a/haas-spim-benchmark/src/main/java/cz/it4i/fiji/haas_spim_benchmark/core/Constants.java b/haas-spim-benchmark/src/main/java/cz/it4i/fiji/haas_spim_benchmark/core/Constants.java
index 75af41aa70f0508fa426b89efe48cf0127f5a784..79b451ac0d9901466ebfa4609d16d9a604ccb98f 100644
--- a/haas-spim-benchmark/src/main/java/cz/it4i/fiji/haas_spim_benchmark/core/Constants.java
+++ b/haas-spim-benchmark/src/main/java/cz/it4i/fiji/haas_spim_benchmark/core/Constants.java
@@ -55,5 +55,6 @@ public interface Constants {
 	String SUMMARY_FILE_HEADER = "Task;AvgMemoryUsage;AvgWallTime;MaxWallTime;TotalTime;JobCount";
 	String DONE_TASK = "done";
 	int CORES_PER_NODE = 24;
+	String DEMO_DATA_SIGNAL_FILE_NAME = "demodata";
 	
 }