Prevent ISE in the MockMvc PrintingResultHandler

Issue: SPR-12735

spring-test/src/main/java/org/springframework/test/web/servlet/result/PrintingResultHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,6 +18,7 @@ package org.springframework.test.web.servlet.result;
 
 import java.util.Enumeration;
 import java.util.Map;
+
 import javax.servlet.http.HttpServletRequest;
 
 import org.springframework.http.HttpHeaders;
@@ -127,8 +128,15 @@ public class PrintingResultHandler implements ResultHandler {
 
 	protected void printAsyncResult(MvcResult result) throws Exception {
 		HttpServletRequest request = result.getRequest();
-		this.printer.printValue("Was async started", request.isAsyncStarted());
-		this.printer.printValue("Async result", (request.isAsyncStarted() ? result.getAsyncResult(0) : null));
+		this.printer.printValue("Async started", request.isAsyncStarted());
+		Object asyncResult = null;
+		try {
+			asyncResult = result.getAsyncResult(0);
+		}
+		catch (IllegalStateException ex) {
+			// Not set
+		}
+		this.printer.printValue("Async result", asyncResult);
 	}
 
 	/** Print the handler */

spring-test/src/test/java/org/springframework/test/web/servlet/samples/standalone/AsyncTests.java

@@ -16,6 +16,7 @@
 package org.springframework.test.web.servlet.samples.standalone;
 
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
+import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.request;
 import static org.springframework.test.web.servlet.setup.MockMvcBuilders.*;
@@ -56,7 +57,7 @@ public class AsyncTests {
 		this.asyncController = new AsyncController();
 		this.mockMvc = standaloneSetup(this.asyncController).build();
 	}
-	
+
 
 	@Test
 	public void testCallable() throws Exception {
@@ -112,6 +113,25 @@ public class AsyncTests {
 				.andExpect(content().string("{\"name\":\"Joe\",\"someDouble\":0.0,\"someBoolean\":false}"));
 	}
 
+	// SPR-12735
+
+	@Test
+	public void testPrintAsyncResult() throws Exception {
+		MvcResult mvcResult = this.mockMvc.perform(get("/1").param("deferredResult", "true"))
+				.andDo(print())
+				.andExpect(request().asyncStarted())
+				.andReturn();
+
+		this.asyncController.onMessage("Joe");
+
+		this.mockMvc.perform(asyncDispatch(mvcResult))
+				.andDo(print())
+				.andExpect(status().isOk())
+				.andExpect(content().contentType(MediaType.APPLICATION_JSON))
+				.andExpect(content().string("{\"name\":\"Joe\",\"someDouble\":0.0,\"someBoolean\":false}"));
+	}
+
+
 
 	@Controller
 	private static class AsyncController {