diff --git a/js-test/servers/basynthec/datastore_server/etc/service.properties b/js-test/servers/basynthec/datastore_server/etc/service.properties
index 02145d622d987962ddc47a1a5d828f8dcf8d9d62..152ed8d62e1f78721ca41b1c81c53d9a1b41d9da 100644
--- a/js-test/servers/basynthec/datastore_server/etc/service.properties
+++ b/js-test/servers/basynthec/datastore_server/etc/service.properties
@@ -167,3 +167,5 @@ imaging-database.kind = test_js_basynthec
 # Do not change this part unless you are developing openBIS extensions.
 # ---------------------------------------------------------------------------
 
+
+jython-version=2.7
diff --git a/js-test/servers/basynthec/openBIS-server/etc/service.properties b/js-test/servers/basynthec/openBIS-server/etc/service.properties
index 737a873f50d8ad98798b069d7407be4e00fa71ef..165be09fb0d2e9494afe652390fed53729cf3359 100644
--- a/js-test/servers/basynthec/openBIS-server/etc/service.properties
+++ b/js-test/servers/basynthec/openBIS-server/etc/service.properties
@@ -252,3 +252,5 @@ authorization-component-factory = active-authorization
 
 script-folder = ../../../../openbis/source
 
+
+jython-version=2.7
diff --git a/js-test/servers/common/datastore_server/etc/service.properties b/js-test/servers/common/datastore_server/etc/service.properties
index 9dd6b7b5e007e512f4bf8b0f63973edc09415622..abbdfc79ff8f795d8b05a726a3e3052b37adaf77 100644
--- a/js-test/servers/common/datastore_server/etc/service.properties
+++ b/js-test/servers/common/datastore_server/etc/service.properties
@@ -177,3 +177,5 @@ proteomics-sql-root-folder = ../../../../rtd_phosphonetx/source/
 # Do not change this part unless you are developing openBIS extensions.
 # ---------------------------------------------------------------------------
 
+
+jython-version=2.7
diff --git a/js-test/servers/common/datastore_server2/etc/service.properties b/js-test/servers/common/datastore_server2/etc/service.properties
index 846a170bb82328f30d55322903101fa586f7fcb5..5316c547656141003fc99782366a5a2219a4fa97 100644
--- a/js-test/servers/common/datastore_server2/etc/service.properties
+++ b/js-test/servers/common/datastore_server2/etc/service.properties
@@ -177,3 +177,5 @@ proteomics-sql-root-folder = ../../../../rtd_phosphonetx/source/
 # Do not change this part unless you are developing openBIS extensions.
 # ---------------------------------------------------------------------------
 
+
+jython-version=2.7
diff --git a/js-test/servers/common/openBIS-server/etc/service.properties b/js-test/servers/common/openBIS-server/etc/service.properties
index f323e4f3ba8cc34a1f737998f5972d6e11bff4d3..c7376d44972f24aa9e3ff6d69863bad22425822f 100644
--- a/js-test/servers/common/openBIS-server/etc/service.properties
+++ b/js-test/servers/common/openBIS-server/etc/service.properties
@@ -252,3 +252,5 @@ authorization-component-factory = active-authorization
 
 script-folder = ../../../../openbis/source
 
+
+jython-version=2.7
diff --git a/js-test/servers/dsu/datastore_server/etc/service.properties b/js-test/servers/dsu/datastore_server/etc/service.properties
index 3269238c9699b79051fe9fe89f75c63eefeff3e2..8577efad9ec9df804813e5b50bff4538c363d1fe 100644
--- a/js-test/servers/dsu/datastore_server/etc/service.properties
+++ b/js-test/servers/dsu/datastore_server/etc/service.properties
@@ -167,3 +167,5 @@ imaging-database.kind = test_js_dsu
 # Do not change this part unless you are developing openBIS extensions.
 # ---------------------------------------------------------------------------
 
+
+jython-version=2.7
diff --git a/js-test/servers/dsu/openBIS-server/etc/service.properties b/js-test/servers/dsu/openBIS-server/etc/service.properties
index 0f2f855411d051336228d5719a3ce1b5bc4d9b59..d7142c7290753563a75bf692285db49f6468301d 100644
--- a/js-test/servers/dsu/openBIS-server/etc/service.properties
+++ b/js-test/servers/dsu/openBIS-server/etc/service.properties
@@ -252,3 +252,5 @@ authorization-component-factory = active-authorization
 
 script-folder = ../../../../openbis/source
 
+
+jython-version=2.7
diff --git a/js-test/servers/novartis/datastore_server/etc/service.properties b/js-test/servers/novartis/datastore_server/etc/service.properties
index 2c1d3157614bf576e7c6a04d503735877f4a95bd..c645bc21c0f028947bdddc5b2b83e1b98d77ee1b 100644
--- a/js-test/servers/novartis/datastore_server/etc/service.properties
+++ b/js-test/servers/novartis/datastore_server/etc/service.properties
@@ -167,3 +167,5 @@ imaging-database.kind = test_js_novartis
 # Do not change this part unless you are developing openBIS extensions.
 # ---------------------------------------------------------------------------
 
+
+jython-version=2.7
diff --git a/js-test/servers/novartis/openBIS-server/etc/service.properties b/js-test/servers/novartis/openBIS-server/etc/service.properties
index 59e0e7eca93cbe2aab1facfc15a4c1e953af592c..9a294ffdc85ad3d8f7029e3f43f50e31b8c95fcf 100644
--- a/js-test/servers/novartis/openBIS-server/etc/service.properties
+++ b/js-test/servers/novartis/openBIS-server/etc/service.properties
@@ -252,3 +252,5 @@ authorization-component-factory = active-authorization
 
 script-folder = ../../../../openbis/source
 
+
+jython-version=2.7
diff --git a/js-test/servers/yeastlab/datastore_server/etc/service.properties b/js-test/servers/yeastlab/datastore_server/etc/service.properties
index 25acfcc24263c32210d29e917aeaaaba4baea82c..6e9f35a35c9016cca6867cb1d5ddb188aa4aae1b 100644
--- a/js-test/servers/yeastlab/datastore_server/etc/service.properties
+++ b/js-test/servers/yeastlab/datastore_server/etc/service.properties
@@ -167,3 +167,5 @@ imaging-database.kind = test_js_yeastlab
 # Do not change this part unless you are developing openBIS extensions.
 # ---------------------------------------------------------------------------
 
+
+jython-version=2.7
diff --git a/js-test/servers/yeastlab/openBIS-server/etc/service.properties b/js-test/servers/yeastlab/openBIS-server/etc/service.properties
index 7707215c2079286a75aa0887601c4f31f93463d5..ddf0eb809f598d64313d852440e382af91c4a645 100644
--- a/js-test/servers/yeastlab/openBIS-server/etc/service.properties
+++ b/js-test/servers/yeastlab/openBIS-server/etc/service.properties
@@ -252,3 +252,5 @@ authorization-component-factory = active-authorization
 
 script-folder = ../../../../openbis/source
 
+
+jython-version=2.7