diff --git a/jetty-bom/pom.xml b/jetty-bom/pom.xml
index 50e3f41f506..3d3a4c0f793 100644
--- a/jetty-bom/pom.xml
+++ b/jetty-bom/pom.xml
@@ -116,6 +116,26 @@
         <artifactId>jetty-alpn-java-server</artifactId>
         <version>10.0.0-SNAPSHOT</version>
       </dependency>
+      <dependency>
+        <groupId>org.eclipse.jetty</groupId>
+        <artifactId>jetty-alpn-openjdk8-client</artifactId>
+        <version>9.4.8-SNAPSHOT</version>
+      </dependency>
+      <dependency>
+        <groupId>org.eclipse.jetty</groupId>
+        <artifactId>jetty-alpn-openjdk8-server</artifactId>
+        <version>9.4.8-SNAPSHOT</version>
+      </dependency>
+      <dependency>
+        <groupId>org.eclipse.jetty</groupId>
+        <artifactId>jetty-alpn-conscrypt-client</artifactId>
+        <version>9.4.8-SNAPSHOT</version>
+      </dependency>
+      <dependency>
+        <groupId>org.eclipse.jetty</groupId>
+        <artifactId>jetty-alpn-conscrypt-server</artifactId>
+        <version>9.4.8-SNAPSHOT</version>
+      </dependency>
       <dependency>
         <groupId>org.eclipse.jetty</groupId>
         <artifactId>jetty-alpn-server</artifactId>
diff --git a/jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHolder.java b/jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHolder.java
index bf17dbffdf7..3c0ce02fdab 100644
--- a/jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHolder.java
+++ b/jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHolder.java
@@ -81,11 +81,11 @@ public class ServletHolder extends Holder<Servlet> implements UserIdentity.Scope
     private ServletRegistration.Dynamic _registration;
     private JspContainer _jspContainer;
 
-    private transient Servlet _servlet;
-    private transient Config _config;
-    private transient long _unavailable;
-    private transient boolean _enabled = true;
-    private transient UnavailableException _unavailableEx;
+    private Servlet _servlet;
+    private long _unavailable;
+    private Config _config;
+    private boolean _enabled = true;
+    private UnavailableException _unavailableEx;
 
 
     public static final String APACHE_SENTINEL_CLASS = "org.apache.tomcat.InstanceManager";
@@ -528,7 +528,7 @@ public class ServletHolder extends Holder<Servlet> implements UserIdentity.Scope
      */
     public boolean isAvailable()
     {
-        if (isStarted()&& _unavailable==0)
+        if (isStarted() && _unavailable==0)
             return true;
         try
         {
@@ -539,7 +539,7 @@ public class ServletHolder extends Holder<Servlet> implements UserIdentity.Scope
             LOG.ignore(e);
         }
 
-        return isStarted()&& _unavailable==0;
+        return isStarted() && _unavailable==0;
     }
 
     /* ------------------------------------------------------------ */
@@ -773,20 +773,30 @@ public class ServletHolder extends Holder<Servlet> implements UserIdentity.Scope
             baseRequest.setAttribute(Request.__MULTIPART_CONFIG_ELEMENT, mpce);
     }
 
-    public synchronized Servlet ensureInstance()
+    public Servlet ensureInstance()
     throws ServletException, UnavailableException
     {
-        if (_class==null)
-            throw new UnavailableException("Servlet Not Initialized");
-        Servlet servlet=_servlet;
         if (!isStarted())
             throw new UnavailableException("Servlet not initialized", -1);
-        if (_unavailable!=0 || (!_initOnStartup && servlet==null))
-            servlet=getServlet();
-        if (servlet==null)
-            throw new UnavailableException("Could not instantiate "+_class);
 
-        return servlet;
+        Servlet servlet=_servlet;
+        if (servlet!=null && _unavailable==0)
+            return servlet;
+
+        synchronized(this)
+        {
+            servlet=_servlet;
+            if (servlet!=null)
+                return servlet;
+            if (_class == null)
+                throw new UnavailableException("Servlet Not Initialized");
+            if (_unavailable != 0 || (!_initOnStartup && servlet == null))
+                servlet = getServlet();
+            if (servlet == null)
+                throw new UnavailableException("Could not instantiate " + _class);
+
+            return servlet;
+        }
     }
 
     /* ------------------------------------------------------------ */