在 KeyPairGeneratorSpec.Builder 的 PowerMock 上获取 NullPointerException

Question

我正在尝试在我的一个测试用例代码中对 KeyPairGeneratorSpec class 进行 Powermock，这样做时面临 NullpointerException。 我是框架的新手，请让我知道我哪里出错了。 我已经尝试过 KeyGenParameterSpec class，但没有发现任何问题。 任何指向正确方向的帮助将不胜感激。

@RunWith(PowerMockRunner.class)
@PrepareForTest({KeyStore.class,Cipher.class, Base64.class,RSAEncoding.class,Cipher.class,Key.class})
@PowerMockIgnore({})

 @Test
    public void testKeyPairGenSpec() throws Exception {
        ReflectionHelpers.setStaticField(Build.VERSION.class, "SDK_INT", 21);

        RSAEncoding rsAEncoding = new RSAEncoding(KEY_ALIAS);

        Context mContext = PowerMockito.mock(Context.class);
        KeyPairGeneratorSpec spec = PowerMockito.mock(KeyPairGeneratorSpec.class);
        KeyPairGeneratorSpec.Builder builder = newKeyPairGeneratorSpecBuilder(spec);
        PowerMockito.whenNew(KeyPairGeneratorSpec.Builder.class).withArguments(mContext).thenReturn(builder);
        WhiteboxImpl.invokeMethod(rsAEncoding, "getKeySpec");

   
    }

目标代码

 private  AlgorithmParameterSpec getKeySpec()
    {
        Calendar start = Calendar.getInstance();
        Calendar end = Calendar.getInstance();
        end.add(Calendar.YEAR, 25);
        AppExpanLog.d(TAG, "NEW_LOG" + "getKeyPairGenSpec");
        AlgorithmParameterSpec spec;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            spec = new KeyGenParameterSpec.Builder(KEY_ALIAS, KeyProperties.PURPOSE_DECRYPT | KeyProperties.PURPOSE_ENCRYPT)
                    .setCertificateSubject(new X500Principal("CN=" + KEY_ALIAS))
                    .setCertificateSerialNumber(BigInteger.ONE)
                    .setCertificateNotBefore(start.getTime())
                    .setCertificateNotAfter(end.getTime())
                    .setKeySize(2048)
                    .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_PKCS1)
                    .setBlockModes(KeyProperties.BLOCK_MODE_ECB)
                    .build();
        }
        else {
            KeyPairGeneratorSpec.Builder specBuilder = new KeyPairGeneratorSpec.Builder(context)
                    .setAlias(KEY_ALIAS)
                    .setSubject(new X500Principal("CN=" + KEY_ALIAS))
                    .setKeySize(2048)
                    .setSerialNumber(BigInteger.ONE)
                    .setStartDate(start.getTime())
                    .setEndDate(end.getTime());
            spec = specBuilder.build();
        }

        return spec;
    }

堆栈跟踪

java.lang.NullPointerException
    at com.amazon.appexpan.client.util.RSAEncoding.getKeySpec(RSAEncoding.java:174)
    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.powermock.reflect.internal.WhiteboxImpl.performMethodInvocation(WhiteboxImpl.java:1873)
    at org.powermock.reflect.internal.WhiteboxImpl.doInvokeMethod(WhiteboxImpl.java:773)
    at org.powermock.reflect.internal.WhiteboxImpl.invokeMethod(WhiteboxImpl.java:638)
    at com.amazon.appexpan.client.util.RSAEncodingTest.testKeyPairGenSpec(RSAEncodingTest.java:198)
    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.internal.runners.TestMethod.invoke(TestMethod.java:68)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:310)
    at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:89)
    at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:97)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:294)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:127)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
    at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:87)
    at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:50)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
    at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
    at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:122)
    at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:106)
    at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
    at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)


Process finished with exit code 255