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Spring JUnit Testing : java.lang.NullPointerException

 
Greenhorn
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I am trying to write test case using `JUnit` for `Repository` method. I refered This document for writing test case.
http://www.baeldung.com/spring-boot-testing . But I am getting null pointer Exception.

**DepaertmentRepository**


   @Repository
       public interface DepaertmentRepository extends JpaRepository<Department, Integer> {
       
        Department findByNDeptId(Integer nDeptId);
       }
       
**DepartmentRepositoryTest**    
   
   
   package com.spacestudy;
   
   import static org.assertj.core.api.Assertions.assertThat;
   
   import org.junit.Test;
   import org.junit.runner.RunWith;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
   import org.springframework.boot.test.autoconfigure.orm.jpa.TestEntityManager;
   import org.springframework.test.context.junit4.SpringRunner;
   
   import com.spacestudy.model.Department;
   import com.spacestudy.repository.DepaertmentRepository;
   
   
   @RunWith(SpringRunner.class)
   @DataJpaTest
   public class DepartmentRepositoryTest extends SpaceStudyTests{
   
    @Autowired
    private TestEntityManager entityManager;
   
    @Autowired
    private DepaertmentRepository depRepo;
   
   
    @Test
    public void test1()throws Exception {
   
    //given
    Department dep = new Department();
    dep.setnDeptId(1);
    entityManager.merge(dep);
       
       //when
   Department found = depRepo.findByNDeptId(1);
   
   System.out.println(found);// here i am getting null
   
   assertThat(dep.getnDeptId())
     .isEqualTo(found.getnDeptId());      
   
    }
   }
**Error**

   java.lang.NullPointerException
   at com.spacestudy.DepartmentRepositoryTest.test1(DepartmentRepositoryTest.java:41)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
   at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
   at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
   at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
   at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
   at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
   at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
   at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
   at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
   at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
   at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
   at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
   at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
   at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
   at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
   at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
   at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
   at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
   at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
   at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
   at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

 

 
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