• spring boot单元测试之druid NullPointException问题解决

    背景

    最近单元测试使用了spock框架。

    说实话，对于spock就是一小菜鸟。

    groovy语法基本靠猜。

    好不容跑起来了，却报了数据库连接从错误。

    错误信息

    1. java.lang.NullPointerException
    2.  
    3. at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:94)
    4.  
    5. at org.springframework.test.web.servlet.setup.PatternMappingFilterProxy.doFilter(PatternMappingFilterProxy.java:101)
    6.  
    7. at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:127)
    8.  
    9. at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
    10.  
    11. at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    12.  
    13. at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:127)
    14.  
    15. at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:108)
    16.  
    17. at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    18.  
    19. at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:127)
    20.  
    21. at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
    22.  
    23. at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    24.  
    25. at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:127)
    26.  
    27. at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
    28.  
    29. at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    30.  
    31. at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:127)
    32.  
    33. at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:155)
    34.  
    35. at com.dlxd.scau.web.ProductTypeControllerTest.testSave(ProductTypeControllerTest.java:34)
    36.  
    37. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    38.  
    39. at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    40.  
    41. at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    42.  
    43. at java.lang.reflect.Method.invoke(Method.java:498)
    44.  
    45. at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    46.  
    47. at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    48.  
    49. at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    50.  
    51. at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    52.  
    53. at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    54.  
    55. at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    56.  
    57. at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    58.  
    59. at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    60.  
    61. at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
    62.  
    63. at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
    64.  
    65. at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    66.  
    67. at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    68.  
    69. at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    70.  
    71. at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    72.  
    73. at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    74.  
    75. at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    76.  
    77. at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    78.  
    79. at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    80.  
    81. at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    82.  
    83. at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    84.  
    85. at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    86.  
    87. at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:539)
    88.  
    89. at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:761)
    90.  
    91. at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:461)

    看的头皮发麻，简单来讲，就是没有连上数据库。

    根据网络上有人分析，具体原因是因为druid配置的filter未初始化

    问题解决方案

    百度了两个解决方案（对我没用）

    方法1：

    单元测试中添加如下代码

    1. /**
    3. * web项目上下文
    5. */
    6.  
    7. @Autowired
    8.  
    9. private WebApplicationContext webApplicationContext;
    10.  
    11. /**
    13. * 所有测试方法执行之前执行该方法
    15. */
    16.  
    17. @Before
    18.  
    19. public void before() {
    20.  
    21. //获取mockmvc对象实例
    22.  
    23. mvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
    24.  
    25. } 

    方法2：

    使用MockMvc测试时, WebStatFilter类其实是没有用的.

    现在可用的解决方案是:

    加入 druid-spring-boot-starter 依赖

    在application-test.properties中增加配置

    spring.datasource.druid.web-stat-filter.enabled=false

    在测试类上增加@activeprofiles("test") 

    --------------------------------------------贼溜溜的分界线-------------------------------------------------------

    我找到的有效解决方案

    有效解决方案

    在@SpringBootTest注解上添加webEnvironment的注解值

    @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)

    简单看了下代码。发现SpringBootTest.WebEnvironment默认值是MOCK。

    MOCK的话好像不能初始化druid。

    为什么这个webEnvironment=WebEnvironment.MOCK参数可以控制Filter的初始化过程？

    建议你可以看下这篇文章，说的应该比较详细

     

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  • 原文地址：https://blog.csdn.net/m290345792/article/details/125484986