diff --git a/13/mariadb-tomcat/Dockerfile b/13/mariadb-tomcat/Dockerfile
index ab97fc872eda09bb12094ce31945731311c8bbd6..3d0d28f3f3138b6e91d41d623de6c294dcaba300 100644
--- a/13/mariadb-tomcat/Dockerfile
+++ b/13/mariadb-tomcat/Dockerfile
@@ -17,7 +17,7 @@
 # Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 # ---------------------------------------------------------------------------
-FROM tomcat:9-jre11
+FROM tomcat:9-jre11-openjdk
 
 #    ____  ____  ____      ____  _   __        _
 #   |_  _||_  _||_  _|    |_  _|(_) [  |  _   (_)
diff --git a/13/mysql-tomcat/Dockerfile b/13/mysql-tomcat/Dockerfile
index 1dbab21015f11bed37e72893a08098e0c64d67aa..062e022a7cf9434f6a2a76a75ff1bf7d8d9eb0a9 100644
--- a/13/mysql-tomcat/Dockerfile
+++ b/13/mysql-tomcat/Dockerfile
@@ -17,7 +17,7 @@
 # Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 # ---------------------------------------------------------------------------
-FROM tomcat:9-jre11
+FROM tomcat:9-jre11-openjdk
 
 #    ____  ____  ____      ____  _   __        _
 #   |_  _||_  _||_  _|    |_  _|(_) [  |  _   (_)
diff --git a/13/postgres-tomcat/Dockerfile b/13/postgres-tomcat/Dockerfile
index 1f6960c2f9368353717d6f211ab726d339a394fc..a69f5dd7565d8878ba7bbb527d39819543ef51bc 100644
--- a/13/postgres-tomcat/Dockerfile
+++ b/13/postgres-tomcat/Dockerfile
@@ -17,7 +17,7 @@
 # Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 # ---------------------------------------------------------------------------
-FROM tomcat:9-jre11
+FROM tomcat:9-jre11-openjdk
 
 #    ____  ____  ____      ____  _   __        _
 #   |_  _||_  _||_  _|    |_  _|(_) [  |  _   (_)
diff --git a/14/mariadb-tomcat/Dockerfile b/14/mariadb-tomcat/Dockerfile
index 1e9b36546b2dbe6262e3d2aaa50987e44a1f7aeb..8819d7ede0b8b8501ac1ef1dec95cf6569555e42 100644
--- a/14/mariadb-tomcat/Dockerfile
+++ b/14/mariadb-tomcat/Dockerfile
@@ -17,7 +17,7 @@
 # Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 # ---------------------------------------------------------------------------
-FROM tomcat:9-jre11
+FROM tomcat:9-jre11-openjdk
 
 #    ____  ____  ____      ____  _   __        _
 #   |_  _||_  _||_  _|    |_  _|(_) [  |  _   (_)
diff --git a/14/mysql-tomcat/Dockerfile b/14/mysql-tomcat/Dockerfile
index 12ee7d3dbce2543fa56f1efde4045eb3631223f9..948252c4b86fdf9aa4cd4252991f5e76c1d58b1d 100644
--- a/14/mysql-tomcat/Dockerfile
+++ b/14/mysql-tomcat/Dockerfile
@@ -17,7 +17,7 @@
 # Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 # ---------------------------------------------------------------------------
-FROM tomcat:9-jre11
+FROM tomcat:9-jre11-openjdk
 
 #    ____  ____  ____      ____  _   __        _
 #   |_  _||_  _||_  _|    |_  _|(_) [  |  _   (_)
diff --git a/14/postgres-tomcat/Dockerfile b/14/postgres-tomcat/Dockerfile
index 1bef7968653367d88e8395636da16dbc1c7d5c34..4e23cb6b12a59a8ed3a8cd75b95f3af32f1230fb 100644
--- a/14/postgres-tomcat/Dockerfile
+++ b/14/postgres-tomcat/Dockerfile
@@ -17,7 +17,7 @@
 # Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 # ---------------------------------------------------------------------------
-FROM tomcat:9-jre11
+FROM tomcat:9-jre11-openjdk
 
 #    ____  ____  ____      ____  _   __        _
 #   |_  _||_  _||_  _|    |_  _|(_) [  |  _   (_)
diff --git a/template/Dockerfile b/template/Dockerfile
index ca4a1e19ad9129eaa2b626a4e112f208156ecb38..fb5189a1025b01f71286044e57670456eb74e0e9 100644
--- a/template/Dockerfile
+++ b/template/Dockerfile
@@ -17,7 +17,7 @@
 # Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 # 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 # ---------------------------------------------------------------------------
-FROM tomcat:9-jre11
+FROM tomcat:9-jre11-openjdk
 
 #    ____  ____  ____      ____  _   __        _
 #   |_  _||_  _||_  _|    |_  _|(_) [  |  _   (_)