diff --git a/modules/java/CMakeLists.txt b/modules/java/CMakeLists.txt
index 1a1512d36..68d3ff9ca 100644
--- a/modules/java/CMakeLists.txt
+++ b/modules/java/CMakeLists.txt
@@ -7,6 +7,13 @@ if(IOS OR WINRT OR NOT PYTHON_DEFAULT_AVAILABLE OR NOT ANT_EXECUTABLE OR NOT (JN
   ocv_module_disable(java)
 endif()
 
+if(EXISTS ${CMAKE_BINARY_DIR}/src)
+  execute_process(COMMAND ${CMAKE_COMMAND} -E remove_directory "${CMAKE_BINARY_DIR}/src")
+endif()
+if(EXISTS ${CMAKE_BINARY_DIR}/gen)
+  execute_process(COMMAND ${CMAKE_COMMAND} -E remove_directory "${CMAKE_BINARY_DIR}/gen")
+endif()
+
 set(the_description "The java bindings")
 ocv_add_module(java BINDINGS opencv_core opencv_imgproc)
 ocv_module_include_directories("${CMAKE_CURRENT_SOURCE_DIR}/generator/src/cpp")
diff --git a/modules/java/android_lib/AndroidManifest.xml b/modules/java/android_lib/AndroidManifest.xml
index 1943221e9..228c6cfbb 100644
--- a/modules/java/android_lib/AndroidManifest.xml
+++ b/modules/java/android_lib/AndroidManifest.xml
@@ -4,5 +4,5 @@
       android:versionCode="@OPENCV_VERSION_MAJOR@@OPENCV_VERSION_MINOR@@OPENCV_VERSION_PATCH@0"
       android:versionName="@OPENCV_VERSION@">
 
-    <uses-sdk android:minSdkVersion="8" />
+    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" />
 </manifest>
diff --git a/platforms/android/build-tests/test_ant_build.py b/platforms/android/build-tests/test_ant_build.py
index 8ed2bdd66..73ac4d018 100644
--- a/platforms/android/build-tests/test_ant_build.py
+++ b/platforms/android/build-tests/test_ant_build.py
@@ -17,7 +17,7 @@ class TestAntBuild(unittest.TestCase):
         self.sample_dir = os.path.join(self.workdir, "project")
 
     def shortDescription(self):
-        return "TARGET: %s, SAMPLE: %s" % (self.target, os.path.basename(self.src_sample_dir))
+        return "TARGET: %r, SAMPLE: %s" % (self.target, os.path.basename(self.src_sample_dir))
 
     def setUp(self):
         if os.path.exists(self.workdir):
@@ -32,7 +32,7 @@ class TestAntBuild(unittest.TestCase):
             shutil.rmtree(self.workdir)
 
     def runTest(self):
-        cmd = [os.path.join(os.environ["ANDROID_SDK"], "tools", "android"), "update", "project", "-p", self.lib_dir, "-t", self.target]
+        cmd = [os.path.join(os.environ["ANDROID_SDK"], "tools", "android"), "update", "project", "-p", self.lib_dir, "-t", self.target[0]]
         retcode = subprocess.call(cmd)
         self.assertEqual(retcode, 0, "android update opencv project failed")
 
@@ -40,7 +40,7 @@ class TestAntBuild(unittest.TestCase):
         retcode = subprocess.call(cmd)
         self.assertEqual(retcode, 0, "opencv ant build failed")
 
-        cmd = [os.path.join(os.environ["ANDROID_SDK"], "tools", "android"), "update", "project", "-p", self.sample_dir, "-t", self.target, "-l", os.path.relpath(self.lib_dir, self.sample_dir)]
+        cmd = [os.path.join(os.environ["ANDROID_SDK"], "tools", "android"), "update", "project", "-p", self.sample_dir, "-t", self.target[1], "-l", os.path.relpath(self.lib_dir, self.sample_dir)]
         retcode = subprocess.call(cmd)
         self.assertEqual(retcode, 0, "android update sample project failed")
 
@@ -50,7 +50,7 @@ class TestAntBuild(unittest.TestCase):
 
 def suite(workdir, opencv_lib_path, opencv_samples_path):
     suite = unittest.TestSuite()
-    for target in ["android-14", "android-17"]:
+    for target in [("android-21", "android-14"), ("android-21", "android-17")]:
         for item in os.listdir(opencv_samples_path):
             item = os.path.join(opencv_samples_path, item)
             if (os.path.exists(os.path.join(item, "AndroidManifest.xml"))):