我是按照老师的敲的怎么会报错

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java.lang.NullPointerException atorg.seckill.dao.SeckillDaoTest.queryById(SeckillDaoTest.java:25) atsun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod) atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) atjava.lang.reflect.Method.invoke(Method.java:498) atorg.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) atorg.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) atorg.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) atorg.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) atorg.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73) atorg.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82) atorg.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:73) atorg.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) atorg.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:224) atorg.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83) atorg.junit.runners.ParentRunner$3.run(ParentRunner.java:238) atorg.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) atorg.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) atorg.junit.runners.ParentRunner.access$000(ParentRunner.java:53) atorg.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) atorg.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) atorg.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68) atorg.junit.runners.ParentRunner.run(ParentRunner.java:309) atorg.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163) atorg.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) atorg.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678) atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) atorg.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

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dg52***

@autowiredprivate SeckillDao seckillDao;

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