[FIXED JENKINS-14667] JDK installation failed on some slaves with...

[FIXED JENKINS-14667] JDK installation failed on some slaves with InvalidClassException: hudson.tools.JDKInstaller$Platform$1; local class incompatible: …

changelog.html

@@ -55,6 +55,9 @@ Upcoming changes</a>
 <!-- Record your changes in the trunk here. -->
 <div id="trunk" style="display:none"><!--=TRUNK-BEGIN=-->
 <ul class=image>
+  <li class=bug>
+    JDK installation failed on some slaves with <code>InvalidClassException: hudson.tools.JDKInstaller$Platform$1; local class incompatible: …</code>
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-14667">issue 14667</a>)
   <li class=rfe>
     Provide symlink support on all possible platforms when using Java 7+, including newer versions of Windows.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-13202">issue 13202</a>)

core/src/main/java/hudson/tools/JDKInstaller.java

@@ -490,11 +490,7 @@ public class JDKInstaller extends ToolInstaller {
          * Determines the platform of the given node.
          */
         public static Platform of(Node n) throws IOException,InterruptedException,DetectionFailedException {
-            return n.getChannel().call(new Callable<Platform,DetectionFailedException>() {
-                public Platform call() throws DetectionFailedException {
-                    return current();
-                }
-            });
+            return n.getChannel().call(new GetCurrentPlatform());
         }
 
         public static Platform current() throws DetectionFailedException {
@@ -504,6 +500,14 @@ public class JDKInstaller extends ToolInstaller {
             if(arch.contains("sun") || arch.contains("solaris"))    return SOLARIS;
             throw new DetectionFailedException("Unknown CPU name: "+arch);
         }
+
+        static class GetCurrentPlatform implements Callable<Platform,DetectionFailedException> {
+            private static final long serialVersionUID = 1L;
+            public Platform call() throws DetectionFailedException {
+                return current();
+            }
+        }
+
     }
 
     /**