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diff --git a/jdisc_core/src/main/java/com/yahoo/jdisc/service/ContainerNotReadyException.java b/jdisc_core/src/main/java/com/yahoo/jdisc/service/ContainerNotReadyException.java
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+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.jdisc.service;
+
+import com.yahoo.jdisc.Container;
+import com.yahoo.jdisc.Request;
+import com.yahoo.jdisc.application.ContainerActivator;
+import com.yahoo.jdisc.application.ContainerBuilder;
+
+import java.net.URI;
+
+/**
+ * This exception is used to signal that no {@link Container} is ready to serve {@link Request}s. An instance of this
+ * class will be thrown by the {@link CurrentContainer#newReference(URI)} method if it is called before a Container has
+ * been activated, or after a <em>null</em> argument has been passed to {@link ContainerActivator#activateContainer(ContainerBuilder)}.
+ *
+ * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
+ */
+public final class ContainerNotReadyException extends RuntimeException {
+
+    /**
+     * Constructs a new instance of this class with a detail message.
+     */
+    public ContainerNotReadyException() {
+        super("Container not ready.");
+    }
+}