Installing the released snsnotify-plugin v1.9 on a completely stock Jenkins v1.614 does not work. Builds using the plugin fail with the following exception on stdout:

java.lang.NoClassDefFoundError: org/apache/http/util/Args
at org.apache.http.conn.scheme.Scheme.<init>(Scheme.java:90)
at org.apache.http.impl.conn.SchemeRegistryFactory.createDefault(SchemeRegistryFactory.java:50)
at com.amazonaws.http.ConnectionManagerFactory.createPoolingClientConnManager(ConnectionManagerFactory.java:29)
at com.amazonaws.http.HttpClientFactory.createHttpClient(HttpClientFactory.java:104)
at com.amazonaws.http.AmazonHttpClient.<init>(AmazonHttpClient.java:198)
at com.amazonaws.AmazonWebServiceClient.<init>(AmazonWebServiceClient.java:132)
at com.amazonaws.AmazonWebServiceClient.<init>(AmazonWebServiceClient.java:116)
at com.amazonaws.services.sns.AmazonSNSClient.<init>(AmazonSNSClient.java:147)
at com.amazonaws.services.sns.AmazonSNSClient.<init>(AmazonSNSClient.java:128)
at org.jenkinsci.plugins.snsnotify.AmazonSNSNotifier.send(AmazonSNSNotifier.java:156)
at org.jenkinsci.plugins.snsnotify.AmazonSNSNotifier.sendSafe(AmazonSNSNotifier.java:102)
at org.jenkinsci.plugins.snsnotify.AmazonSNSNotifier.onStarted(AmazonSNSNotifier.java:79)
at org.jenkinsci.plugins.snsnotify.BuildListener.onStarted(BuildListener.java:19)
at org.jenkinsci.plugins.snsnotify.BuildListener.onStarted(BuildListener.java:8)
at hudson.model.listeners.RunListener.fireStarted(RunListener.java:215)
at hudson.model.Run.execute(Run.java:1740)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:374)
Caused by: java.lang.ClassNotFoundException: org.apache.http.util.Args
at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1376)
at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1326)
at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1079)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 19 more

An easy fix is to add the following to the pom.xml and rebuild:

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.1</version>
</dependency>