Mixing
Powermock+JUnit - NullPointerException with new class
0
Getting NullPointerException when I try to mock a method and that method has a local variable with new class. Tried different way, but no luck. Please see the comments, I have mentioned what I tried and where I am getting exception.
Thanks in advance!
@RunWith(PowerMockRunner.class)
@PrepareForTest(StudentController.class)
public class StudentControllerTest {
@Mock
HttpServletRequest request;
@Mock
StudentService studentService;
@InjectMocks
StudentController studentController;
@Test
public void create() {
Student student =mock(Student.class);
**// Also tried Student student = new Student();**
student.setName("Name");
student.setAddress("New York");
when(studentService.create(student)).thenReturn(student);
// if I try below code I am getting compile error - Type mismatch: cannot convert from Matcher<Student> to Student
//when(studentService.create(any(Student.class))).thenReturn(student);
Student createdStudent= studentController("Name", "New York", 1);
assertTrue(0 < createdStudent.getStudentId())
}
}
Studentcontroller.java
@PostMapping("/api/student/create")
public Student create(HttpServletRequest request, @RequestParam("name") String name, @RequestParam("address") String address, @RequestParam("grade") String grade) {
Student student = new Student();
try {
student.setName(name);
student.setAddress(address);
student.setGrade(Integer.decode(grade));
student = studentService.create(student);
**// Throwing NullPointer in this line. I did dubug and can see student returned is null**
message = "Successfully Created Student[" + student.getId() + "] " + name;
} catch (Exception e) {
message = "Exception while create the student: " + name;
log.error(message + "n" + StackTraceUtil.getStackTrace(e));
student.setErrorMessage(message);
}
return student;
}
SOLUTION:
I was using org.hamcrest.CoreMatchers.any That gives compile error Type mismatch: cannot convert from Matcher<Student> to Student
Now I changed it to org.mockito.ArgumentMatcher.any
You can either one of below two. Both will work.
The key was importing org.mockito.ArgumentMatcher.any
Student student =mock(Student.class);
student.setName("Name");
student.setAddress("New York");
OR
Student student = new Student();
student.setName("Name");
student.setAddress("New York");
java junit mockito powermock
asked Jan 2 at 21:28
SK.SK.
414424
|
show 4 more comments
0
Getting NullPointerException when I try to mock a method and that method has a local variable with new class. Tried different way, but no luck. Please see the comments, I have mentioned what I tried and where I am getting exception.
Thanks in advance!
@RunWith(PowerMockRunner.class)
@PrepareForTest(StudentController.class)
public class StudentControllerTest {
@Mock
HttpServletRequest request;
@Mock
StudentService studentService;
@InjectMocks
StudentController studentController;
@Test
public void create() {
Student student =mock(Student.class);
**// Also tried Student student = new Student();**
student.setName("Name");
student.setAddress("New York");
when(studentService.create(student)).thenReturn(student);
// if I try below code I am getting compile error - Type mismatch: cannot convert from Matcher<Student> to Student
//when(studentService.create(any(Student.class))).thenReturn(student);
Student createdStudent= studentController("Name", "New York", 1);
assertTrue(0 < createdStudent.getStudentId())
}
}
Studentcontroller.java
@PostMapping("/api/student/create")
public Student create(HttpServletRequest request, @RequestParam("name") String name, @RequestParam("address") String address, @RequestParam("grade") String grade) {
Student student = new Student();
try {
student.setName(name);
student.setAddress(address);
student.setGrade(Integer.decode(grade));
student = studentService.create(student);
**// Throwing NullPointer in this line. I did dubug and can see student returned is null**
message = "Successfully Created Student[" + student.getId() + "] " + name;
} catch (Exception e) {
message = "Exception while create the student: " + name;
log.error(message + "n" + StackTraceUtil.getStackTrace(e));
student.setErrorMessage(message);
}
return student;
}
SOLUTION:
I was using org.hamcrest.CoreMatchers.any That gives compile error Type mismatch: cannot convert from Matcher<Student> to Student
Now I changed it to org.mockito.ArgumentMatcher.any
You can either one of below two. Both will work.
The key was importing org.mockito.ArgumentMatcher.any
Student student =mock(Student.class);
student.setName("Name");
student.setAddress("New York");
OR
Student student = new Student();
student.setName("Name");
student.setAddress("New York");
java junit mockito powermock
asked Jan 2 at 21:28
SK.SK.
414424
Did you include the@RunWith(runner-goes-here)annotation in your test class?
– Stalemate Of Tuning
Jan 2 at 21:32
Make sure a mocked studentService exists and is being properly injected.
– Compass
Jan 2 at 21:33
Show us your entireStudentControllerTestclass please
– Stalemate Of Tuning
Jan 2 at 21:35
Based on the method under test, the tight coupling tonew Student()and the fact that the matcher setup in the test wont match the one created in the method under test, thenstudentService.createwill return null.
– Nkosi
Jan 2 at 21:39
@Nkosi - I was thinking so as well. any solution without changing the Controller, I mean only changing the test class ?
– SK.
Jan 2 at 21:42
|
show 4 more comments
0
0
0
0
Getting NullPointerException when I try to mock a method and that method has a local variable with new class. Tried different way, but no luck. Please see the comments, I have mentioned what I tried and where I am getting exception.
Thanks in advance!
@RunWith(PowerMockRunner.class)
@PrepareForTest(StudentController.class)
public class StudentControllerTest {
@Mock
HttpServletRequest request;
@Mock
StudentService studentService;
@InjectMocks
StudentController studentController;
@Test
public void create() {
Student student =mock(Student.class);
**// Also tried Student student = new Student();**
student.setName("Name");
student.setAddress("New York");
when(studentService.create(student)).thenReturn(student);
// if I try below code I am getting compile error - Type mismatch: cannot convert from Matcher<Student> to Student
//when(studentService.create(any(Student.class))).thenReturn(student);
Student createdStudent= studentController("Name", "New York", 1);
assertTrue(0 < createdStudent.getStudentId())
}
}
Studentcontroller.java
@PostMapping("/api/student/create")
public Student create(HttpServletRequest request, @RequestParam("name") String name, @RequestParam("address") String address, @RequestParam("grade") String grade) {
Student student = new Student();
try {
student.setName(name);
student.setAddress(address);
student.setGrade(Integer.decode(grade));
student = studentService.create(student);
**// Throwing NullPointer in this line. I did dubug and can see student returned is null**
message = "Successfully Created Student[" + student.getId() + "] " + name;
} catch (Exception e) {
message = "Exception while create the student: " + name;
log.error(message + "n" + StackTraceUtil.getStackTrace(e));
student.setErrorMessage(message);
}
return student;
}
SOLUTION:
I was using org.hamcrest.CoreMatchers.any That gives compile error Type mismatch: cannot convert from Matcher<Student> to Student
Now I changed it to org.mockito.ArgumentMatcher.any
You can either one of below two. Both will work.
The key was importing org.mockito.ArgumentMatcher.any
Student student =mock(Student.class);
student.setName("Name");
student.setAddress("New York");
OR
Student student = new Student();
student.setName("Name");
student.setAddress("New York");
java junit mockito powermock
asked Jan 2 at 21:28
SK.SK.
414424
Getting NullPointerException when I try to mock a method and that method has a local variable with new class. Tried different way, but no luck. Please see the comments, I have mentioned what I tried and where I am getting exception.
Thanks in advance!
@RunWith(PowerMockRunner.class)
@PrepareForTest(StudentController.class)
public class StudentControllerTest {
@Mock
HttpServletRequest request;
@Mock
StudentService studentService;
@InjectMocks
StudentController studentController;
@Test
public void create() {
Student student =mock(Student.class);
**// Also tried Student student = new Student();**
student.setName("Name");
student.setAddress("New York");
when(studentService.create(student)).thenReturn(student);
// if I try below code I am getting compile error - Type mismatch: cannot convert from Matcher<Student> to Student
//when(studentService.create(any(Student.class))).thenReturn(student);
Student createdStudent= studentController("Name", "New York", 1);
assertTrue(0 < createdStudent.getStudentId())
}
}
Studentcontroller.java
@PostMapping("/api/student/create")
public Student create(HttpServletRequest request, @RequestParam("name") String name, @RequestParam("address") String address, @RequestParam("grade") String grade) {
Student student = new Student();
try {
student.setName(name);
student.setAddress(address);
student.setGrade(Integer.decode(grade));
student = studentService.create(student);
**// Throwing NullPointer in this line. I did dubug and can see student returned is null**
message = "Successfully Created Student[" + student.getId() + "] " + name;
} catch (Exception e) {
message = "Exception while create the student: " + name;
log.error(message + "n" + StackTraceUtil.getStackTrace(e));
student.setErrorMessage(message);
}
return student;
}
SOLUTION:
I was using org.hamcrest.CoreMatchers.any That gives compile error Type mismatch: cannot convert from Matcher<Student> to Student
Now I changed it to org.mockito.ArgumentMatcher.any
You can either one of below two. Both will work.
The key was importing org.mockito.ArgumentMatcher.any
Student student =mock(Student.class);
student.setName("Name");
student.setAddress("New York");
OR
Student student = new Student();
student.setName("Name");
student.setAddress("New York");
java junit mockito powermock
java junit mockito powermock
asked Jan 2 at 21:28
SK.SK.
414424
asked Jan 2 at 21:28
SK.SK.
414424
edited Jan 3 at 14:06
SK.
asked Jan 2 at 21:28
SK.SK.
414424
asked Jan 2 at 21:28
SK.SK.
414424
asked Jan 2 at 21:28
SK.SK.
414424
414424
Did you include the@RunWith(runner-goes-here)annotation in your test class?
– Stalemate Of Tuning
Jan 2 at 21:32
Make sure a mocked studentService exists and is being properly injected.
– Compass
Jan 2 at 21:33
Show us your entireStudentControllerTestclass please
– Stalemate Of Tuning
Jan 2 at 21:35
Based on the method under test, the tight coupling tonew Student()and the fact that the matcher setup in the test wont match the one created in the method under test, thenstudentService.createwill return null.
– Nkosi
Jan 2 at 21:39
@Nkosi - I was thinking so as well. any solution without changing the Controller, I mean only changing the test class ?
– SK.
Jan 2 at 21:42
|
show 4 more comments
Did you include the@RunWith(runner-goes-here)annotation in your test class?
– Stalemate Of Tuning
Jan 2 at 21:32
Make sure a mocked studentService exists and is being properly injected.
– Compass
Jan 2 at 21:33
Show us your entireStudentControllerTestclass please
– Stalemate Of Tuning
Jan 2 at 21:35
Based on the method under test, the tight coupling tonew Student()and the fact that the matcher setup in the test wont match the one created in the method under test, thenstudentService.createwill return null.
– Nkosi
Jan 2 at 21:39
@Nkosi - I was thinking so as well. any solution without changing the Controller, I mean only changing the test class ?
– SK.
Jan 2 at 21:42
Did you include the
@RunWith(runner-goes-here) annotation in your test class?– Stalemate Of Tuning
Jan 2 at 21:32
Did you include the
@RunWith(runner-goes-here) annotation in your test class?– Stalemate Of Tuning
Jan 2 at 21:32
Make sure a mocked studentService exists and is being properly injected.
– Compass
Jan 2 at 21:33
Make sure a mocked studentService exists and is being properly injected.
– Compass
Jan 2 at 21:33
Show us your entire
StudentControllerTest class please– Stalemate Of Tuning
Jan 2 at 21:35
Show us your entire
StudentControllerTest class please– Stalemate Of Tuning
Jan 2 at 21:35
Based on the method under test, the tight coupling to
new Student() and the fact that the matcher setup in the test wont match the one created in the method under test, then studentService.create will return null.– Nkosi
Jan 2 at 21:39
Based on the method under test, the tight coupling to
new Student() and the fact that the matcher setup in the test wont match the one created in the method under test, then studentService.create will return null.– Nkosi
Jan 2 at 21:39
@Nkosi - I was thinking so as well. any solution without changing the Controller, I mean only changing the test class ?
– SK.
Jan 2 at 21:42
@Nkosi - I was thinking so as well. any solution without changing the Controller, I mean only changing the test class ?
– SK.
Jan 2 at 21:42
|
show 4 more comments
1 Answer
1
active
oldest
votes
1
Based on the method under test, the tight coupling to new Student() and the fact that the matcher setup in the test wont match the one created in the method under test, then studentService.create will return null.
There really is no need for a Student mock since the method under test is already creating one.
Use a more flexible argument matcher like any(Student.class), capture the passed argument in the setup and set the desired id so the method under test can flow to completion.
For example
@RunWith(PowerMockRunner.class)
@PrepareForTest(StudentController.class)
public class StudentControllerTest {
@Mock
HttpServletRequest request;
@Mock
StudentService studentService;
@InjectMocks
StudentController studentController;
@Test
public void create() {
//Arrange
int expectedId = 1;
when(studentService.create(any(Student.class)))
.thenAnswer(i -> {
Student student = (Student)i.getArguments()[0];
//manipulate the student as needed.
//Like setting an id
//...student.setId(expectedId)
return student;
});
//Act
Student createdStudent = studentController.create(request, "Name", "New York", 1);
//Assert
assertTrue(createdStudent != null);
assertTrue(expectedId == createdStudent.getStudentId());
}
}
answered Jan 2 at 22:09
NkosiNkosi
120k17139204
I really appreciate your time to help me. I tried your solution, I am getting the same error (Typemissmatch) as I mentioned in the comment in my question code.
– SK.
Jan 3 at 13:50
and I may get error in cobertura as it doesn't understand lambda
– SK.
Jan 3 at 13:51
I got it. I have been using org.hamcrest.CoreMatchers.any. Now I changed it to org.mockito.ArgumentMatcher.any. No other changes required in my code. I updated the solution in my question
– SK.
Jan 3 at 14:01
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1 Answer
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1 Answer
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oldest
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oldest
votes
1
Based on the method under test, the tight coupling to new Student() and the fact that the matcher setup in the test wont match the one created in the method under test, then studentService.create will return null.
There really is no need for a Student mock since the method under test is already creating one.
Use a more flexible argument matcher like any(Student.class), capture the passed argument in the setup and set the desired id so the method under test can flow to completion.
For example
@RunWith(PowerMockRunner.class)
@PrepareForTest(StudentController.class)
public class StudentControllerTest {
@Mock
HttpServletRequest request;
@Mock
StudentService studentService;
@InjectMocks
StudentController studentController;
@Test
public void create() {
//Arrange
int expectedId = 1;
when(studentService.create(any(Student.class)))
.thenAnswer(i -> {
Student student = (Student)i.getArguments()[0];
//manipulate the student as needed.
//Like setting an id
//...student.setId(expectedId)
return student;
});
//Act
Student createdStudent = studentController.create(request, "Name", "New York", 1);
//Assert
assertTrue(createdStudent != null);
assertTrue(expectedId == createdStudent.getStudentId());
}
}
answered Jan 2 at 22:09
NkosiNkosi
120k17139204
I really appreciate your time to help me. I tried your solution, I am getting the same error (Typemissmatch) as I mentioned in the comment in my question code.
– SK.
Jan 3 at 13:50
and I may get error in cobertura as it doesn't understand lambda
– SK.
Jan 3 at 13:51
I got it. I have been using org.hamcrest.CoreMatchers.any. Now I changed it to org.mockito.ArgumentMatcher.any. No other changes required in my code. I updated the solution in my question
– SK.
Jan 3 at 14:01
add a comment |
1
Based on the method under test, the tight coupling to new Student() and the fact that the matcher setup in the test wont match the one created in the method under test, then studentService.create will return null.
There really is no need for a Student mock since the method under test is already creating one.
Use a more flexible argument matcher like any(Student.class), capture the passed argument in the setup and set the desired id so the method under test can flow to completion.
For example
@RunWith(PowerMockRunner.class)
@PrepareForTest(StudentController.class)
public class StudentControllerTest {
@Mock
HttpServletRequest request;
@Mock
StudentService studentService;
@InjectMocks
StudentController studentController;
@Test
public void create() {
//Arrange
int expectedId = 1;
when(studentService.create(any(Student.class)))
.thenAnswer(i -> {
Student student = (Student)i.getArguments()[0];
//manipulate the student as needed.
//Like setting an id
//...student.setId(expectedId)
return student;
});
//Act
Student createdStudent = studentController.create(request, "Name", "New York", 1);
//Assert
assertTrue(createdStudent != null);
assertTrue(expectedId == createdStudent.getStudentId());
}
}
answered Jan 2 at 22:09
NkosiNkosi
120k17139204
I really appreciate your time to help me. I tried your solution, I am getting the same error (Typemissmatch) as I mentioned in the comment in my question code.
– SK.
Jan 3 at 13:50
and I may get error in cobertura as it doesn't understand lambda
– SK.
Jan 3 at 13:51
I got it. I have been using org.hamcrest.CoreMatchers.any. Now I changed it to org.mockito.ArgumentMatcher.any. No other changes required in my code. I updated the solution in my question
– SK.
Jan 3 at 14:01
add a comment |
1
1
1
Based on the method under test, the tight coupling to new Student() and the fact that the matcher setup in the test wont match the one created in the method under test, then studentService.create will return null.
There really is no need for a Student mock since the method under test is already creating one.
Use a more flexible argument matcher like any(Student.class), capture the passed argument in the setup and set the desired id so the method under test can flow to completion.
For example
@RunWith(PowerMockRunner.class)
@PrepareForTest(StudentController.class)
public class StudentControllerTest {
@Mock
HttpServletRequest request;
@Mock
StudentService studentService;
@InjectMocks
StudentController studentController;
@Test
public void create() {
//Arrange
int expectedId = 1;
when(studentService.create(any(Student.class)))
.thenAnswer(i -> {
Student student = (Student)i.getArguments()[0];
//manipulate the student as needed.
//Like setting an id
//...student.setId(expectedId)
return student;
});
//Act
Student createdStudent = studentController.create(request, "Name", "New York", 1);
//Assert
assertTrue(createdStudent != null);
assertTrue(expectedId == createdStudent.getStudentId());
}
}
answered Jan 2 at 22:09
NkosiNkosi
120k17139204
Based on the method under test, the tight coupling to new Student() and the fact that the matcher setup in the test wont match the one created in the method under test, then studentService.create will return null.
There really is no need for a Student mock since the method under test is already creating one.
Use a more flexible argument matcher like any(Student.class), capture the passed argument in the setup and set the desired id so the method under test can flow to completion.
For example
@RunWith(PowerMockRunner.class)
@PrepareForTest(StudentController.class)
public class StudentControllerTest {
@Mock
HttpServletRequest request;
@Mock
StudentService studentService;
@InjectMocks
StudentController studentController;
@Test
public void create() {
//Arrange
int expectedId = 1;
when(studentService.create(any(Student.class)))
.thenAnswer(i -> {
Student student = (Student)i.getArguments()[0];
//manipulate the student as needed.
//Like setting an id
//...student.setId(expectedId)
return student;
});
//Act
Student createdStudent = studentController.create(request, "Name", "New York", 1);
//Assert
assertTrue(createdStudent != null);
assertTrue(expectedId == createdStudent.getStudentId());
}
}
answered Jan 2 at 22:09
NkosiNkosi
120k17139204
answered Jan 2 at 22:09
NkosiNkosi
120k17139204
answered Jan 2 at 22:09
NkosiNkosi
120k17139204
answered Jan 2 at 22:09
NkosiNkosi
120k17139204
120k17139204
I really appreciate your time to help me. I tried your solution, I am getting the same error (Typemissmatch) as I mentioned in the comment in my question code.
– SK.
Jan 3 at 13:50
and I may get error in cobertura as it doesn't understand lambda
– SK.
Jan 3 at 13:51
I got it. I have been using org.hamcrest.CoreMatchers.any. Now I changed it to org.mockito.ArgumentMatcher.any. No other changes required in my code. I updated the solution in my question
– SK.
Jan 3 at 14:01
add a comment |
I really appreciate your time to help me. I tried your solution, I am getting the same error (Typemissmatch) as I mentioned in the comment in my question code.
– SK.
Jan 3 at 13:50
and I may get error in cobertura as it doesn't understand lambda
– SK.
Jan 3 at 13:51
I got it. I have been using org.hamcrest.CoreMatchers.any. Now I changed it to org.mockito.ArgumentMatcher.any. No other changes required in my code. I updated the solution in my question
– SK.
Jan 3 at 14:01
I really appreciate your time to help me. I tried your solution, I am getting the same error (Typemissmatch) as I mentioned in the comment in my question code.
– SK.
Jan 3 at 13:50
I really appreciate your time to help me. I tried your solution, I am getting the same error (Typemissmatch) as I mentioned in the comment in my question code.
– SK.
Jan 3 at 13:50
and I may get error in cobertura as it doesn't understand lambda
– SK.
Jan 3 at 13:51
and I may get error in cobertura as it doesn't understand lambda
– SK.
Jan 3 at 13:51
I got it. I have been using org.hamcrest.CoreMatchers.any. Now I changed it to org.mockito.ArgumentMatcher.any. No other changes required in my code. I updated the solution in my question
– SK.
Jan 3 at 14:01
I got it. I have been using org.hamcrest.CoreMatchers.any. Now I changed it to org.mockito.ArgumentMatcher.any. No other changes required in my code. I updated the solution in my question
– SK.
Jan 3 at 14:01
add a comment |
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Required, but never shown
Required, but never shown
Required, but never shown
Did you include the
@RunWith(runner-goes-here)annotation in your test class?– Stalemate Of Tuning
Jan 2 at 21:32
Make sure a mocked studentService exists and is being properly injected.
– Compass
Jan 2 at 21:33
Show us your entire
StudentControllerTestclass please– Stalemate Of Tuning
Jan 2 at 21:35
Based on the method under test, the tight coupling to
new Student()and the fact that the matcher setup in the test wont match the one created in the method under test, thenstudentService.createwill return null.– Nkosi
Jan 2 at 21:39
@Nkosi - I was thinking so as well. any solution without changing the Controller, I mean only changing the test class ?
– SK.
Jan 2 at 21:42