Admin MVC: Dump cache contents to log

server/src/main/java/org/gringlobal/mvc/admin/CacheController.java

@@ -78,6 +78,24 @@ public class CacheController {
 		return "redirect:/admin/cache/";
 	}
 
+	@RequestMapping(method = RequestMethod.POST, value = "/dump")
+	public String dumpCache(@RequestParam(required = true, value = "name") String cacheName) {
+		final Cache cache = cacheManager.getCache(cacheName);
+		if (cache != null) {
+			LOG.warn("Inspecting cache {} of type {}", cacheName, cache.getNativeCache().getClass());
+			var nativeCache =  cache.getNativeCache();
+			if (nativeCache instanceof IMap<?,?>) {
+				var hzMap = (IMap<?,?>) nativeCache;
+				hzMap.forEach((key, value) -> {
+					LOG.warn("Key={} [{}]: [{}]\n\t={}", key, key.getClass(), value.getClass(), value);
+				});
+			}
+		} else {
+			LOG.info("No such cache: {}", cacheName);
+		}
+		return "redirect:/admin/cache/";
+	}
+
 	@RequestMapping("/")
 	public String cacheStats(Model model) {
 		List<CacheStats> cacheMaps = new ArrayList<CacheStats>();

server/src/main/webapp/WEB-INF/jsp/admin/cache.jsp

@@ -32,7 +32,7 @@
 				<td style="text-align: right;">
 					Efficiency
 				</td>
-				<td class="col-sm-1 col-xs-2">
+				<td class="col-xs-1">
 					<form class="form-inline" method="post"
 						action="<c:url value="/admin/cache/clearCache" />">
 						<button type="submit" name="clearAll" class="btn btn-warning">Zap!</button>
@@ -80,8 +80,8 @@
 							</p>
 						</c:if>
 					</td>
-	
-					<td class="col-sm-1 col-xs-2">
+
+					<td class="col-xs-1">
 						<form method="post"
 							action="<c:url value="/admin/cache/clearCache" />">
 							<input type="hidden" name="name" value="${cacheMap.name}" />
@@ -91,6 +91,17 @@
 								value="${_csrf.token}" />
 						</form>
 					</td>
+
+					<td class="col-xs-1">
+						<form method="post"
+							action="<c:url value="/admin/cache/dump" />">
+							<input type="hidden" name="name" value="${cacheMap.name}" />
+							<button type="submit" class="btn btn-default btn-sm">Dump</button>
+							<!-- CSRF protection -->
+							<input type="hidden" name="${_csrf.parameterName}"
+								value="${_csrf.token}" />
+						</form>
+					</td>
 				</tr>
 			</c:forEach>
 		</tbody>