diff --git a/README.md b/README.md
index 42ee357746..0577dceb8e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Swagger Code Generator
 
 [![Build Status](https://travis-ci.org/swagger-api/swagger-codegen.png)](https://travis-ci.org/swagger-api/swagger-codegen)
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.swagger/swagger-codegen-project/badge.svg?style=plastic)](https://maven-badges.herokuapp.com/maven-central/io.swagger/swagger-codegen-project)
 
 ## Overview
 This is the swagger codegen project, which allows generation of client libraries automatically from a Swagger-compliant server.  
diff --git a/bin/all-petstore.sh b/bin/all-petstore.sh
index 180e95590b..2f9d4c0c0f 100755
--- a/bin/all-petstore.sh
+++ b/bin/all-petstore.sh
@@ -33,7 +33,6 @@ cd $APP_DIR
 ./bin/perl-petstore.sh
 ./bin/php-petstore.sh
 ./bin/python-petstore.sh
-./bin/python3-petstore.sh
 ./bin/qt5-petstore.sh
 ./bin/ruby-petstore.sh
 ./bin/scala-async-petstore.sh
diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java
index b5f544a749..840e646b5d 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java
@@ -492,10 +492,16 @@ public class DefaultCodegen {
         } else if (p instanceof DecimalProperty) {
             datatype = "number";
         } else if (p instanceof RefProperty) {
-            RefProperty r = (RefProperty) p;
-            datatype = r.get$ref();
-            if (datatype.indexOf("#/definitions/") == 0) {
-                datatype = datatype.substring("#/definitions/".length());
+            try {
+                RefProperty r = (RefProperty) p;
+                datatype = r.get$ref();
+                if (datatype.indexOf("#/definitions/") == 0) {
+                    datatype = datatype.substring("#/definitions/".length());
+                }
+            } catch (Exception e) {
+                LOGGER.warn("Error obtaining the datatype from RefProperty:" + p + ". Datatype default to Object");
+                datatype = "Object";
+                e.printStackTrace();
             }
         } else {
             if (p != null) {
@@ -584,7 +590,7 @@ public class DefaultCodegen {
                 }
             }
             // interfaces (intermediate models)
-            if (allDefinitions != null) {
+            if (allDefinitions != null && composed.getInterfaces() != null) {
                 for (RefModel _interface : composed.getInterfaces()) {
                     final String interfaceRef = toModelName(_interface.getSimpleRef());
                     final Model interfaceModel = allDefinitions.get(interfaceRef);
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/ApiClient.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/ApiClient.java
index c4b1153dcd..d468a50f9e 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/ApiClient.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/ApiClient.java
@@ -39,7 +39,7 @@ import io.swagger.client.auth.HttpBasicAuth;
 import io.swagger.client.auth.ApiKeyAuth;
 import io.swagger.client.auth.OAuth;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class ApiClient {
   private Map<String, Client> hostMap = new HashMap<String, Client>();
   private Map<String, String> defaultHeaderMap = new HashMap<String, String>();
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/ApiException.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/ApiException.java
index 649e4132cb..d4b75ae39d 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/ApiException.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/ApiException.java
@@ -3,7 +3,7 @@ package io.swagger.client;
 import java.util.Map;
 import java.util.List;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class ApiException extends Exception {
   private int code = 0;
   private Map<String, List<String>> responseHeaders = null;
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/Configuration.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/Configuration.java
index e7837fa47a..5ad2bfb904 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/Configuration.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/Configuration.java
@@ -1,6 +1,6 @@
 package io.swagger.client;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class Configuration {
   private static ApiClient defaultApiClient = new ApiClient();
 
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/JSON.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/JSON.java
index 19c2420656..13acc71c60 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/JSON.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/JSON.java
@@ -6,7 +6,7 @@ import com.fasterxml.jackson.datatype.joda.*;
 
 import java.io.IOException;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class JSON {
   private ObjectMapper mapper;
 
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/Pair.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/Pair.java
index 78c15c6c2a..11bed7752c 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/Pair.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/Pair.java
@@ -1,6 +1,6 @@
 package io.swagger.client;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class Pair {
     private String name = "";
     private String value = "";
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/StringUtil.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/StringUtil.java
index 2348914456..d00d8e4e42 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/StringUtil.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/StringUtil.java
@@ -1,6 +1,6 @@
 package io.swagger.client;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class StringUtil {
   /**
    * Check if the given array contains the given value (with case-insensitive comparison).
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/TypeRef.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/TypeRef.java
index a0ebe35507..818a1b9cca 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/TypeRef.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/TypeRef.java
@@ -3,7 +3,7 @@ package io.swagger.client;
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class TypeRef<T> {
     private final Type type;
 
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/ApiKeyAuth.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/ApiKeyAuth.java
index 69d80c755b..3d081ca0d4 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/ApiKeyAuth.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/ApiKeyAuth.java
@@ -5,7 +5,7 @@ import io.swagger.client.Pair;
 import java.util.Map;
 import java.util.List;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class ApiKeyAuth implements Authentication {
   private final String location;
   private final String paramName;
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/Authentication.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/Authentication.java
index 0c254861af..1c914f25e1 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/Authentication.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/Authentication.java
@@ -5,7 +5,7 @@ import io.swagger.client.Pair;
 import java.util.Map;
 import java.util.List;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public interface Authentication {
   /** Apply authentication settings to header and query params. */
   void applyToParams(List<Pair> queryParams, Map<String, String> headerParams);
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/HttpBasicAuth.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/HttpBasicAuth.java
index 19dfa96e9f..68466d0918 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/HttpBasicAuth.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/HttpBasicAuth.java
@@ -8,7 +8,7 @@ import java.util.List;
 import java.io.UnsupportedEncodingException;
 import javax.xml.bind.DatatypeConverter;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class HttpBasicAuth implements Authentication {
   private String username;
   private String password;
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/OAuth.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/OAuth.java
index ef89432a35..996922d567 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/OAuth.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/auth/OAuth.java
@@ -5,7 +5,7 @@ import io.swagger.client.Pair;
 import java.util.Map;
 import java.util.List;
 
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class OAuth implements Authentication {
   @Override
   public void applyToParams(List<Pair> queryParams, Map<String, String> headerParams) {
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/Category.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/Category.java
index ea615a58e9..8e49fe2f1d 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/Category.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/Category.java
@@ -9,7 +9,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 
 
 @ApiModel(description = "")
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class Category   {
   
   private Long id = null;
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/Tag.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/Tag.java
index 98ff0c44e1..7d112784c9 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/Tag.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/Tag.java
@@ -9,7 +9,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 
 
 @ApiModel(description = "")
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class Tag   {
   
   private Long id = null;
diff --git a/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/User.java b/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/User.java
index f4a80143b9..2331a90f7d 100644
--- a/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/User.java
+++ b/samples/client/petstore/java/default/src/main/java/io/swagger/client/model/User.java
@@ -9,7 +9,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 
 
 @ApiModel(description = "")
-@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-09-30T16:27:52.437+08:00")
+@javax.annotation.Generated(value = "class io.swagger.codegen.languages.JavaClientCodegen", date = "2015-10-01T23:05:28.119+08:00")
 public class User   {
   
   private Long id = null;