nullpointerexception

dphi5xsq  于 2021-07-16  发布在  Java
关注(0)|答案(1)|浏览(399)

我一直在尝试单元测试（不运行spring容器）我的自定义约束注解，但是当我运行测试时，nullpointerexception被抛出，我不知道为什么会发生这种情况。
nullpointerexception指出 this.validator = null 在验证程序类中。
我在听那个答案https://stackoverflow.com/a/41671471/9377513 写测试的时候。但我不知道为什么这种方法在我的情况下不起作用。
测试期间引发的整个异常：

  1. java.lang.NullPointerException: Cannot invoke "javax.validation.Validator.validate(Object, java.lang.Class[])" because "this.validator" is null
  3. at com.radgac.vmmrestapi.annotations.AddressCheckTest.addressCheckWithinRangeTest(AddressCheckTest.java:32)
  4. at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  5. at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
  6. at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  7. at java.base/java.lang.reflect.Method.invoke(Method.java:564)
  8. at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
  9. at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
  10. at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
  11. at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
  12. at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
  13. at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestTemplateMethod(TimeoutExtension.java:92)
  14. at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
  15. at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
  16. at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
  17. at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
  18. at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
  19. at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
  20. at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
  21. at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
  22. at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)
  23. at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
  24. at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)
  25. at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)
  26. at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
  27. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
  28. at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
  29. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
  30. at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
  31. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
  32. at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
  33. at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
  34. at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
  35. at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
  36. at org.junit.platform.engine.support.hierarchical.NodeTestTask$DefaultDynamicTestExecutor.execute(NodeTestTask.java:212)
  37. at org.junit.platform.engine.support.hierarchical.NodeTestTask$DefaultDynamicTestExecutor.execute(NodeTestTask.java:192)
  38. at org.junit.jupiter.engine.descriptor.TestTemplateTestDescriptor.execute(TestTemplateTestDescriptor.java:139)
  39. at org.junit.jupiter.engine.descriptor.TestTemplateTestDescriptor.lambda$execute$2(TestTemplateTestDescriptor.java:107)
  40. at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
  41. at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
  42. at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
  43. at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
  44. at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
  45. at java.base/java.util.stream.ReferencePipeline$11$1.accept(ReferencePipeline.java:442)
  46. at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
  47. at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
  48. at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
  49. at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
  50. at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
  51. at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
  52. at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
  53. at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
  54. at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
  55. at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
  56. at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
  57. at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
  58. at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274)
  59. at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
  60. at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
  61. at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
  62. at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
  63. at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
  64. at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
  65. at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
  66. at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
  67. at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
  68. at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
  69. at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274)
  70. at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
  71. at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
  72. at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
  73. at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
  74. at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
  75. at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
  76. at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
  77. at org.junit.jupiter.engine.descriptor.TestTemplateTestDescriptor.execute(TestTemplateTestDescriptor.java:107)
  78. at org.junit.jupiter.engine.descriptor.TestTemplateTestDescriptor.execute(TestTemplateTestDescriptor.java:42)
  79. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
  80. at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
  81. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
  82. at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
  83. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
  84. at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
  85. at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
  86. at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
  87. at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
  88. at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
  89. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
  90. at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
  91. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
  92. at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
  93. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
  94. at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
  95. at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
  96. at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
  97. at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
  98. at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
  99. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
  100. at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
  101. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
  102. at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
  103. at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
  104. at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
  105. at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
  106. at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
  107. at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
  108. at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
  109. at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
  110. at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
  111. at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
  112. at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
  113. at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
  114. at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
  115. at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
  116. at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)
  117. at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
  118. at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
  119. at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
  120. at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)

我的自定义约束注解：

  1. @Target({ElementType.FIELD, ElementType.ANNOTATION_TYPE})
  2. @Retention(RetentionPolicy.RUNTIME)
  3. @NotNull
  4. @NotEmpty
  5. @NotBlank
  6. @Size(min = 1, max = 5)
  7. @Constraint(validatedBy = {AddressCheckValidator.class})
  8. public @interface AddressCheck {
  9.     String message() default "Please provide a valid String with length min=1 and max=5";
  11.     Class<?>[] groups() default {};
  13.     Class<? extends Payload>[] payload() default {};
  14. }

我的自定义约束验证器：

  1. public class AddressCheckValidator implements ConstraintValidator<AddressCheck, String> {
  2.     @Override
  3.     public boolean isValid(String s, ConstraintValidatorContext constraintValidatorContext) {
  4.         return s != null && !s.isEmpty() && !s.isBlank() && s.length() <= 5;
  5.     }
  6. }

我的测试班：

  1. public class AddressCheckTest {
  3.     private Validator validator;
  5.     @Before
  6.     public void setUp() {
  7.         validator = Validation.buildDefaultValidatorFactory().getValidator();
  8.     }
  10.     @ParameterizedTest
  11.     @ValueSource(strings = {"a", "ab", "abc", "abcd", "abcde"})
  12.     public void addressCheckWithinRangeTest(String value) {
  13.         var addressCheck = new AddressCheckFieldTest(value);
  14.         Set<ConstraintViolation<AddressCheckFieldTest>> violations = validator.validate(addressCheck);
  15.         assertTrue(violations.isEmpty());
  16.     }
  18.     private static class AddressCheckFieldTest {
  20.         @AddressCheck
  21.         private String addressField;
  23.         public AddressCheckFieldTest(String addressField) {
  24.             this.addressField = addressField;
  25.         }
  27.         public String getAddressField() {
  28.             return addressField;
  29.         }
  31.         public void setAddressField(String addressField) {
  32.             this.addressField = addressField;
  33.         }
  34.     }
  35. }

任何帮助都将不胜感激。

Javaspringspring-bootNullPointerExceptionconstraint-validation

1条答案

按热度按时间
7jmck4yq

7jmck4yq1#

只要是测试，就需要用 @SpringBootTest 启动容器并自动连接 Validator 正确使用 @Autowired 注解。

  1. @SpringBootTest
  2. public class AddressCheckTest {
  4.     @Autowired
  5.     private Validator validator;
  7.     // the rest of the code
  8. }
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