killbill-memoizeit

diff --git a/jaxrs/src/main/java/org/killbill/billing/jaxrs/resources/UsageResource.java b/jaxrs/src/main/java/org/killbill/billing/jaxrs/resources/UsageResource.java
index b55db89..55eee36 100644
--- a/jaxrs/src/main/java/org/killbill/billing/jaxrs/resources/UsageResource.java
+++ b/jaxrs/src/main/java/org/killbill/billing/jaxrs/resources/UsageResource.java
@@ -42,6 +42,8 @@ import org.killbill.billing.entitlement.api.EntitlementApi;
 import org.killbill.billing.entitlement.api.EntitlementApiException;
 import org.killbill.billing.jaxrs.json.RolledUpUsageJson;
 import org.killbill.billing.jaxrs.json.SubscriptionUsageRecordJson;
+import org.killbill.billing.jaxrs.json.SubscriptionUsageRecordJson.UnitUsageRecordJson;
+import org.killbill.billing.jaxrs.json.SubscriptionUsageRecordJson.UsageRecordJson;
 import org.killbill.billing.jaxrs.util.Context;
 import org.killbill.billing.jaxrs.util.JaxrsUriBuilder;
 import org.killbill.billing.payment.api.PaymentApi;
@@ -58,6 +60,7 @@ import org.killbill.commons.metrics.TimedResource;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Iterables;
 import com.google.inject.Singleton;
 import com.wordnik.swagger.annotations.Api;
 import com.wordnik.swagger.annotations.ApiOperation;
@@ -106,7 +109,15 @@ public class UsageResource extends JaxRsResourceBase {
         verifyNonNullOrEmpty(json.getSubscriptionId(), "SubscriptionUsageRecordJson subscriptionId needs to be set",
                              json.getUnitUsageRecords(), "SubscriptionUsageRecordJson unitUsageRecords needs to be set");
         Preconditions.checkArgument(!json.getUnitUsageRecords().isEmpty());
-
+        for (final UnitUsageRecordJson unitUsageRecordJson : json.getUnitUsageRecords()) {
+            verifyNonNullOrEmpty(unitUsageRecordJson.getUnitType(), "UnitUsageRecordJson unitType need to be set");
+            Preconditions.checkArgument(Iterables.size(unitUsageRecordJson.getUsageRecords()) > 0,
+                                        "UnitUsageRecordJson usageRecords must have at least one element.");
+            for (final UsageRecordJson usageRecordJson : unitUsageRecordJson.getUsageRecords()) {
+                verifyNonNull(usageRecordJson.getAmount(), "UsageRecordJson amount needs to be set");
+                verifyNonNull(usageRecordJson.getRecordDate(), "UsageRecordJson recordDate needs to be set");
+            }
+        }
         final CallContext callContext = context.createContext(createdBy, reason, comment, request);
         // Verify subscription exists..
         final Entitlement entitlement = entitlementApi.getEntitlementForId(UUID.fromString(json.getSubscriptionId()), callContext);