diff --git a/modules/java/generator/gen_java.py b/modules/java/generator/gen_java.py
index d4560a972e..f8d3f7d0a5 100755
--- a/modules/java/generator/gen_java.py
+++ b/modules/java/generator/gen_java.py
@@ -991,12 +991,12 @@ class JavaWrapperGenerator(object):
 
         if classinfo.base:
             classinfo.addImports(classinfo.base)
-            type_dict["Ptr_"+name] = \
-                { "j_type" : name,
-                  "jn_type" : "long", "jn_args" : (("__int64", ".nativeObj"),),
-                  "jni_name" : "Ptr<"+name+">(("+name+"*)%(n)s_nativeObj)", "jni_type" : "jlong",
-                  "suffix" : "J" }
-        logging.info('ok: %s', classinfo)
+        type_dict["Ptr_"+name] = \
+            { "j_type" : name,
+              "jn_type" : "long", "jn_args" : (("__int64", ".nativeObj"),),
+              "jni_name" : "Ptr<"+name+">(("+classinfo.fullName(isCPP=True)+"*)%(n)s_nativeObj)", "jni_type" : "jlong",
+              "suffix" : "J" }
+        logging.info('ok: class %s, name: %s, base: %s', classinfo, name, classinfo.base)
 
     def add_const(self, decl): # [ "const cname", val, [], [] ]
         constinfo = ConstInfo(decl, namespaces=self.namespaces)
@@ -1347,7 +1347,7 @@ class JavaWrapperGenerator(object):
                 ret = "return (jlong) new %s(_retval_);" % self.fullTypeName(fi.ctype)
             elif fi.ctype.startswith('Ptr_'):
                 c_prologue.append("typedef Ptr<%s> %s;" % (self.fullTypeName(fi.ctype[4:]), fi.ctype))
-                ret = "return (jlong)(new %(ctype)s(_retval_));" % { 'ctype':fi.ctype }
+                ret = "%(ctype)s* curval = new %(ctype)s(_retval_);return (jlong)curval->get();" % { 'ctype':fi.ctype }
             elif self.isWrapped(ret_type): # pointer to wrapped class:
                 ret = "return (jlong) _retval_;"
             elif type_dict[fi.ctype]["jni_type"] == "jdoubleArray":
diff --git a/modules/ml/include/opencv2/ml.hpp b/modules/ml/include/opencv2/ml.hpp
index cea8aec48c..d016810874 100644
--- a/modules/ml/include/opencv2/ml.hpp
+++ b/modules/ml/include/opencv2/ml.hpp
@@ -285,7 +285,7 @@ public:
         <number_of_variables_in_responses>`, containing types of each input and output variable. See
         ml::VariableTypes.
      */
-    CV_WRAP static Ptr<TrainData> create(InputArray samples, int layout, InputArray responses,
+    CV_WRAP static Ptr<cv::ml::TrainData> create(InputArray samples, int layout, InputArray responses,
                                  InputArray varIdx=noArray(), InputArray sampleIdx=noArray(),
                                  InputArray sampleWeights=noArray(), InputArray varType=noArray());
 };
@@ -320,7 +320,7 @@ public:
     @param flags optional flags, depending on the model. Some of the models can be updated with the
         new training samples, not completely overwritten (such as NormalBayesClassifier or ANN_MLP).
      */
-    CV_WRAP virtual bool train( const Ptr<TrainData>& trainData, int flags=0 );
+    CV_WRAP virtual bool train( const Ptr<cv::ml::TrainData>& trainData, int flags=0 );
 
     /** @brief Trains the statistical model
 
@@ -343,7 +343,7 @@ public:
     The method uses StatModel::predict to compute the error. For regression models the error is
     computed as RMS, for classifiers - as a percent of missclassified samples (0%-100%).
      */
-    CV_WRAP virtual float calcError( const Ptr<TrainData>& data, bool test, OutputArray resp ) const;
+    CV_WRAP virtual float calcError( const Ptr<cv::ml::TrainData>& data, bool test, OutputArray resp ) const;
 
     /** @brief Predicts response(s) for the provided sample(s)
 
@@ -357,7 +357,7 @@ public:
 
     The class must implement static `create()` method with no parameters or with all default parameter values
     */
-    template<typename _Tp> static Ptr<_Tp> train(const Ptr<TrainData>& data, int flags=0)
+    template<typename _Tp> static Ptr<_Tp> train(const Ptr<cv::ml::TrainData>& data, int flags=0)
     {
         Ptr<_Tp> model = _Tp::create();
         return !model.empty() && model->train(data, flags) ? model : Ptr<_Tp>();
@@ -667,7 +667,7 @@ public:
     regression (SVM::EPS_SVR or SVM::NU_SVR). If it is SVM::ONE_CLASS, no optimization is made and
     the usual %SVM with parameters specified in params is executed.
      */
-    virtual bool trainAuto( const Ptr<TrainData>& data, int kFold = 10,
+    virtual bool trainAuto( const Ptr<cv::ml::TrainData>& data, int kFold = 10,
                     ParamGrid Cgrid = SVM::getDefaultGrid(SVM::C),
                     ParamGrid gammaGrid  = SVM::getDefaultGrid(SVM::GAMMA),
                     ParamGrid pGrid      = SVM::getDefaultGrid(SVM::P),