diff --git a/modules/core/misc/java/src/java/core+DMatch.java b/modules/core/misc/java/src/java/core+DMatch.java
index 12bd86ec01..db44d9a0a6 100644
--- a/modules/core/misc/java/src/java/core+DMatch.java
+++ b/modules/core/misc/java/src/java/core+DMatch.java
@@ -45,9 +45,6 @@ public class DMatch {
         distance = _distance;
     }
 
-    /**
-     * Less is better.
-     */
     public boolean lessThan(DMatch it) {
         return distance < it.distance;
     }
diff --git a/modules/java/CMakeLists.txt b/modules/java/CMakeLists.txt
index ed92e0511b..7994332930 100644
--- a/modules/java/CMakeLists.txt
+++ b/modules/java/CMakeLists.txt
@@ -345,7 +345,7 @@ else(ANDROID)
   list(APPEND step3_depends "${OpenCV_BINARY_DIR}/build.xml")
 
   add_custom_command(OUTPUT "${JAR_FILE}" "${JAR_FILE}.dephelper"
-                     COMMAND ${ANT_EXECUTABLE} -q -noinput -k jar
+                     COMMAND ${ANT_EXECUTABLE} -q -noinput -k jar javadoc
                      COMMAND ${CMAKE_COMMAND} -E touch "${JAR_FILE}.dephelper"
                      WORKING_DIRECTORY "${OpenCV_BINARY_DIR}"
                      DEPENDS ${step3_depends}
diff --git a/modules/java/build.xml.in b/modules/java/build.xml.in
index c1c1854b7d..954ff6273c 100644
--- a/modules/java/build.xml.in
+++ b/modules/java/build.xml.in
@@ -2,6 +2,7 @@
 <!-- process, this config is used to package the autogenerated .java -->
 <!-- interface files into OpenCV.jar -->
 <project name="OpenCV">
+
   <target name="jar">
     <!-- This is to make a jar with a source attachment, for e.g. easy -->
     <!-- navigation in Eclipse. See this question: -->
@@ -10,7 +11,21 @@
       <include name="**/*.java"/>
       <compilerarg line="-encoding utf-8"/>
     </javac>
-
     <jar basedir="src" destfile="bin/@JAR_NAME@"/>
   </target>
+
+  <target name="javadoc">
+    <tstamp>
+      <format property="doctimestamp" pattern="EEE MMM d yyyy HH:mm:ss z"/>
+    </tstamp>
+    <javadoc
+      packagenames="org.opencv.*"
+      sourcepath="src"
+      destdir="doc/javadoc"
+      Windowtitle="OpenCV @OPENCV_VERSION_PLAIN@ Java documentation"
+      Doctitle="OpenCV Java documentation (@OPENCV_VERSION@)"
+      bottom="Generated on ${doctimestamp} / OpenCV @OPENCV_VCSVERSION@"
+      />
+  </target>
+
 </project>
diff --git a/modules/java/generator/gen_java.py b/modules/java/generator/gen_java.py
index e63df430bd..c18b9d5f18 100755
--- a/modules/java/generator/gen_java.py
+++ b/modules/java/generator/gen_java.py
@@ -1005,7 +1005,7 @@ class JavaWrapperGenerator(object):
         type_dict["Ptr_"+name] = \
             { "j_type" : classinfo.jname,
               "jn_type" : "long", "jn_args" : (("__int64", ".nativeObj"),),
-              "jni_name" : "Ptr<"+classinfo.fullName(isCPP=True)+">(("+classinfo.fullName(isCPP=True)+"*)%(n)s_nativeObj)", "jni_type" : "jlong",
+              "jni_name" : "*((Ptr<"+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)
 
@@ -1575,7 +1575,7 @@ JNIEXPORT void JNICALL Java_org_opencv_%(module)s_%(j_cls)s_delete
         # if parents are smart (we hope) then children are!
         # if not we believe the class is smart if it has "create" method
         ci.smart = False
-        if ci.base:
+        if ci.base or ci.name == 'Algorithm':
             ci.smart = True
         else:
             for fi in ci.methods:
diff --git a/modules/ml/misc/java/test/MLTest.java b/modules/ml/misc/java/test/MLTest.java
new file mode 100644
index 0000000000..2b08543a84
--- /dev/null
+++ b/modules/ml/misc/java/test/MLTest.java
@@ -0,0 +1,42 @@
+package org.opencv.test.ml;
+
+import org.opencv.ml.Ml;
+import org.opencv.ml.SVM;
+import org.opencv.core.Mat;
+import org.opencv.core.MatOfFloat;
+import org.opencv.core.MatOfInt;
+import org.opencv.core.CvType;
+import org.opencv.test.OpenCVTestCase;
+import org.opencv.test.OpenCVTestRunner;
+
+public class MLTest extends OpenCVTestCase {
+
+    public void testSaveLoad() {
+        Mat samples = new MatOfFloat(new float[] {
+            5.1f, 3.5f, 1.4f, 0.2f,
+            4.9f, 3.0f, 1.4f, 0.2f,
+            4.7f, 3.2f, 1.3f, 0.2f,
+            4.6f, 3.1f, 1.5f, 0.2f,
+            5.0f, 3.6f, 1.4f, 0.2f,
+            7.0f, 3.2f, 4.7f, 1.4f,
+            6.4f, 3.2f, 4.5f, 1.5f,
+            6.9f, 3.1f, 4.9f, 1.5f,
+            5.5f, 2.3f, 4.0f, 1.3f,
+            6.5f, 2.8f, 4.6f, 1.5f
+        }).reshape(1, 10);
+        Mat responses = new MatOfInt(new int[] {
+            0, 0, 0, 0, 0, 1, 1, 1, 1, 1
+        }).reshape(1, 10);
+        SVM saved = SVM.create();
+        assertFalse(saved.isTrained());
+
+        saved.train(samples, Ml.ROW_SAMPLE, responses);
+        assertTrue(saved.isTrained());
+
+        String filename = OpenCVTestRunner.getTempFileName("yml");
+        saved.save(filename);
+        SVM loaded = SVM.load(filename);
+        assertTrue(saved.isTrained());
+    }
+
+}