diff --git a/README.md b/README.md
index 31e5017..865a40b 100644
--- a/README.md
+++ b/README.md
@@ -38,4 +38,4 @@ When you want the slaves to be dynamically provisioned based on a template, choo
 
 To add a node, go to `Manage Jenkins` > `Manage Nodes` > `New Node` and choose `Slave virtual computer running on scripted cloud`. You can configure which scripted cloud to use in the next screen of the wizard.
 
-**Attention:** When `reusable` is turned of, this node will be deleted after the next usage.
\ No newline at end of file
+**Attention:** When `reusable` is turned off, this node will be deleted after the next usage.
diff --git a/pom.xml b/pom.xml
index be08e75..bff7761 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,8 @@
     <parent>
         <groupId>org.jenkins-ci.plugins</groupId>
         <artifactId>plugin</artifactId>
-        <version>3.2</version><!-- which version of Jenkins is this plugin built against? -->
+        <version>4.16</version><!-- which version of Jenkins is this plugin built against? -->
+        <relativePath />
     </parent>
 
     <artifactId>scripted-cloud-plugin</artifactId>
@@ -43,19 +44,43 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <guice.version>3.0</guice.version>
         <ivy.plugin.version>1.19</ivy.plugin.version>
+        <jenkins.version>2.249.1</jenkins.version>
     </properties>
 
+    <dependencies>
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-api</artifactId>
+        <version>1.7.26</version>
+      </dependency>
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>jcl-over-slf4j</artifactId>
+        <version>1.7.26</version>
+      </dependency>
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>log4j-over-slf4j</artifactId>
+        <version>1.7.26</version>
+      </dependency>
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-jdk14</artifactId>
+        <version>1.7.26</version>
+      </dependency>
+    </dependencies>
+
     <repositories>
         <repository>
             <id>repo.jenkins-ci.org</id>
-            <url>http://repo.jenkins-ci.org/public/</url>
+            <url>https://repo.jenkins-ci.org/public/</url>
         </repository>
     </repositories>
 
     <pluginRepositories>
         <pluginRepository>
             <id>repo.jenkins-ci.org</id>
-            <url>http://repo.jenkins-ci.org/public/</url>
+            <url>https://repo.jenkins-ci.org/public/</url>
         </pluginRepository>
     </pluginRepositories>
 
diff --git a/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloud.java b/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloud.java
index 2dae591..488a455 100644
--- a/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloud.java
+++ b/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloud.java
@@ -82,7 +82,7 @@ public synchronized Collection<NodeProvisioner.PlannedNode> provision(Label labe
             final List<ScriptedCloudSlaveTemplate> templates = getMatchingTemplates(label);
 
             for (ScriptedCloudSlaveTemplate t : templates) {
-                LOGGER.log(Level.INFO, "Template: " + t.getDescription());
+                LOGGER.log(Level.INFO, String.format("Template: %s", t.getDescription()));
 
                 boolean canProvision = true;
 
@@ -123,7 +123,7 @@ private boolean canProvisionSlaveTemplate(@Nonnull ScriptedCloudSlaveTemplate te
     }
 
     private int getTemplateInstancesCount(@Nonnull ScriptedCloudSlaveTemplate template) {
-        Computer[] computers = Jenkins.getInstance().getComputers();
+        Computer[] computers = Jenkins.get().getComputers();
 
         int count = 0;
         for (Computer computer : computers){
@@ -138,7 +138,7 @@ private int getTemplateInstancesCount(@Nonnull ScriptedCloudSlaveTemplate templa
     }
 
     private int getInstancesCount() {
-        Computer[] computers = Jenkins.getInstance().getComputers();
+        Computer[] computers = Jenkins.get().getComputers();
 
         int count = 0;
         for (Computer computer : computers){
@@ -188,7 +188,7 @@ public Node call() throws Exception {
                             template.getSecToWaitOnline(),
                             template.getReusable());
 
-            Jenkins.getInstance().addNode(slave);
+            Jenkins.get().addNode(slave);
 
 
             LOGGER.log(Level.INFO, String.format("Asking ScriptedCloud %s to schedule new Jenkins slave %s", name, slaveName));
@@ -284,11 +284,11 @@ private void executeCommand(String command, String name, List<EnvironmentVariabl
         environmentVariables.forEach(ev -> envVars.put(ev.getKey(), ev.getValue()));
 
         envVars.put("SLAVE_NAME", name);
-        envVars.put("JENKINS_URL", Jenkins.getInstance().getRootUrl());
+        envVars.put("JENKINS_URL", Jenkins.get().getRootUrl());
 
         // Support for Jenkins security
-        if (Jenkins.getInstance().isUseSecurity()) {
-            envVars.put("JNLP_SECRET", jenkins.slaves.JnlpSlaveAgentProtocol.SLAVE_SECRET.mac(name));
+        if (Jenkins.get().isUseSecurity()) {
+            envVars.put("JNLP_SECRET", jenkins.slaves.JnlpAgentReceiver.SLAVE_SECRET.mac(name));
         }
 
 
@@ -311,7 +311,7 @@ private void executeCommand(String command, String name, List<EnvironmentVariabl
             throw new AbortException("The script failed with exit code " + result);
         }
 
-        LOGGER.log(Level.FINE, "Script for %s finished successfully.");
+        LOGGER.log(Level.FINE, String.format("Script for, %s, finished successfully.", command));
 
     }
 }
diff --git a/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudLauncher.java b/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudLauncher.java
index 24a856c..202534e 100644
--- a/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudLauncher.java
+++ b/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudLauncher.java
@@ -64,7 +64,7 @@ public void launch(SlaveComputer slaveComputer, TaskListener listener) {
         }
 
         if (launched) {
-            LOGGER.log(INFO, "Agent has already been launched, activating: %s", computer.getDisplayName());
+            LOGGER.log(INFO, String.format("Agent has been launched, activating: %s", computer.getDisplayName()));
             computer.setAcceptingTasks(true);
             return;
         }
@@ -110,7 +110,7 @@ public void launch(SlaveComputer slaveComputer, TaskListener listener) {
                     throw new IllegalStateException("Slave did not come online in allowed time");
                 }
             }
-            LOGGER.log(INFO, "Agent has been launched, activating: %s", computer.getDisplayName());
+            LOGGER.log(INFO, String.format("Agent has been launched, activating: %s", computer.getDisplayName()));
 
             computer.setAcceptingTasks(true);
         } catch (Throwable ex) {
diff --git a/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlave.java b/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlave.java
index c5c13fb..7905790 100644
--- a/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlave.java
+++ b/src/main/java/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlave.java
@@ -54,9 +54,7 @@ public ScriptedCloudSlave(String name, String nodeDescription,
                               List<? extends NodeProperty<?>> nodeProperties,
                               String cloudName, List<EnvironmentVariable> envVars,
                               String secToWaitOnline, Boolean reusable) throws FormException, IOException {
-        super(name, nodeDescription, remoteFS, numExecutors, mode, labelString,
-                new ScriptedCloudLauncher(delegateLauncher, Util.tryParseNumber(secToWaitOnline, 10 * 60).intValue())
-                , retentionStrategy, nodeProperties);
+        super(name, remoteFS, new ScriptedCloudLauncher(delegateLauncher, Util.tryParseNumber(secToWaitOnline, 10 * 60).intValue()) );
 
         this.cloudName = cloudName;
         this.reusable = reusable;
@@ -82,7 +80,7 @@ public String getCloudName() {
     }
 
     public Cloud getCloud() {
-        return Jenkins.getInstance().getCloud(getCloudName());
+        return Jenkins.get().getCloud(getCloudName());
     }
 
     public String getSecToWaitOnline() {
@@ -101,7 +99,7 @@ public int getSecToWaitOnlineInt(){
      */
     @Nonnull
     public ScriptedCloud getScriptedCloud() {
-        Cloud cloud = Jenkins.getInstance().getCloud(getCloudName());
+        Cloud cloud = Jenkins.get().getCloud(getCloudName());
         if (cloud instanceof ScriptedCloud) {
             return (ScriptedCloud) cloud;
         } else {
@@ -248,7 +246,7 @@ public boolean configure(StaplerRequest req, JSONObject o)
 
         public List<ScriptedCloud> getScriptedClouds() {
             List<ScriptedCloud> result = new ArrayList<ScriptedCloud>();
-            for (Cloud cloud : Jenkins.getInstance().clouds) {
+            for (Cloud cloud : Jenkins.get().clouds) {
                 if (cloud instanceof ScriptedCloud) {
                     result.add((ScriptedCloud) cloud);
                 }
diff --git a/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloud/config.jelly b/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloud/config.jelly
index c721d86..d9f4acb 100644
--- a/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloud/config.jelly
+++ b/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloud/config.jelly
@@ -10,11 +10,11 @@
     </f:entry>
 
     <f:entry title="${%Batch or a shell script to start machine}" field="startScript">
-        <f:expandableTextbox/>
+        <f:textarea/>
     </f:entry>
 
     <f:entry title="${%Batch or a shell script to stop machine}" field="stopScript">
-        <f:expandableTextbox/>
+        <f:textarea/>
     </f:entry>
 
     <f:entry title="${%Slave Templates}">
diff --git a/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlave/configure-entries.jelly b/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlave/configure-entries.jelly
index 926b3d3..557b6b4 100644
--- a/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlave/configure-entries.jelly
+++ b/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlave/configure-entries.jelly
@@ -31,6 +31,10 @@
         <f:textbox/>
     </f:entry>
 
+    <f:entry title="${%Executors}" field="numExecutors">
+        <f:textbox default="1"/>
+    </f:entry>
+
     <f:entry title="${%Labels}" field="labelString">
         <f:textbox/>
     </f:entry>
@@ -53,11 +57,7 @@ description="${%Can this slave be used for multiple builds?}"  field="reusable">
                 <j:set var="descriptor" value="${d}"/>
                 <j:set var="instance"
                        value="${it.delegateLauncher.descriptor==d ? it.delegateLauncher : null}"/>
-                <tr>
-                    <td>
-                        <input type="hidden" name="stapler-class" value="${d.clazz.name}"/>
-                    </td>
-                </tr>
+                <f:invisibleEntry><input type="hidden" name="stapler-class" value="${d.clazz.name}"/></f:invisibleEntry>
                 <st:include from="${d}" page="${d.configPage}" optional="true"/>
             </f:dropdownListBlock>
         </j:forEach>
@@ -75,11 +75,7 @@ description="${%Can this slave be used for multiple builds?}"  field="reusable">
                         <j:set var="descriptor" value="${d}"/>
                         <j:set var="instance"
                                value="${it.retentionStrategy.descriptor==d ? it.retentionStrategy : null}"/>
-                        <tr>
-                            <td>
-                                <input type="hidden" name="stapler-class" value="${d.clazz.name}"/>
-                            </td>
-                        </tr>
+                        <f:invisibleEntry><input type="hidden" name="stapler-class" value="${d.clazz.name}"/></f:invisibleEntry>
                         <st:include from="${d}" page="${d.configPage}" optional="true"/>
                     </f:dropdownListBlock>
                 </j:if>
diff --git a/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlaveTemplate/config.jelly b/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlaveTemplate/config.jelly
index d93b4ea..3a8b17c 100644
--- a/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlaveTemplate/config.jelly
+++ b/src/main/resources/org/jenkinsci/plugins/scripted_cloud/ScriptedCloudSlaveTemplate/config.jelly
@@ -20,6 +20,8 @@
             <f:textbox/>
         </f:entry>
 
+        <f:slave-mode name="mode" node="${it}"/>
+
         <f:entry title="${%EnvVars}" description="${%List of environment variables to give to start/stop script}">
             <f:repeatableHeteroProperty field="envVars" hasHeader="true" addCaption="Add Environment Variable"
                                         deleteCaption="Delete Environment Variable"/>
@@ -31,11 +33,6 @@
             <f:textbox default="600"/>
         </f:entry>
 
-        <f:entry title="${%Reusable}" description="${%Can this slave be used for multiple builds?}" field="reusable">
-            <f:checkbox/>
-        </f:entry>
-
-
         <f:entry title="${%Remote FS root}" field="remoteFS">
             <f:textbox/>
         </f:entry>
@@ -44,12 +41,14 @@
             <f:textbox default="1"/>
         </f:entry>
 
-        <f:entry title="${%Executors}" field="numPreprovisioned" description="${%Number of preprovisioned slaves for this template}">
-            <f:textbox default="1"/>
+        <f:entry title="${%Number of preprovisioned instances}" field="numPreprovisioned" description="${%Number of preprovisioned instances for this template}">
+            <f:textbox default="0"/>
         </f:entry>
 
+        <f:entry title="${%Reusable}" description="${%Can this slave be used for multiple builds?}" field="reusable">
+            <f:checkbox/>
+        </f:entry>
 
-        <f:slave-mode name="mode" node="${it}"/>
 
         <!--<f:entry title="">-->
             <!--<div align="right">-->