fix global config is not saved (#7)

Author: mawinter69

pom.xml

@@ -26,7 +26,7 @@
 
   <properties>
     <changelist>999999-SNAPSHOT</changelist>
-    <jenkins.version>2.425</jenkins.version>
+    <jenkins.version>2.426.1</jenkins.version>
   </properties>
 
   <developers>
@@ -61,8 +61,8 @@
     <dependencies>
       <dependency>
         <groupId>io.jenkins.tools.bom</groupId>
-        <artifactId>bom-2.414.x</artifactId>
-        <version>2465.va_e76ed7b_3061</version>
+        <artifactId>bom-2.426.x</artifactId>
+        <version>2612.v3d6a_2128c0ef</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>

src/main/java/org/jenkinsci/plugins/customizebuildnow/AlternateBuildLabelConfiguration.java

@@ -5,12 +5,18 @@
 import jenkins.appearance.AppearanceCategory;
 import jenkins.model.GlobalConfiguration;
 import jenkins.model.GlobalConfigurationCategory;
+import net.sf.json.JSONObject;
 import org.jenkinsci.Symbol;
+import org.kohsuke.stapler.StaplerRequest;
 
 @Symbol("customizeBuildNow")
 @Extension
 public class AlternateBuildLabelConfiguration extends GlobalConfiguration {
 
+  public AlternateBuildLabelConfiguration() {
+    load();
+  }
+
   private String alternateBuildNow;
 
   private String alternateBuildWithParams;
@@ -41,6 +47,13 @@ public void setAlternateBuildButton(String alternateBuildButton) {
     this.alternateBuildButton = alternateBuildButton;
   }
 
+  @Override
+  public boolean configure(StaplerRequest req, JSONObject json) throws FormException {
+    super.configure(req, json);
+    save();
+    return true;
+  }
+
   public static AlternateBuildLabelConfiguration get() {
     return GlobalConfiguration.all().get(AlternateBuildLabelConfiguration.class);
   }