nullpointerexception mediatype

pn9klfpd  于 2021-07-16  发布在  Java
关注(0)|答案(1)|浏览(451)

我正在将SpringBoot应用程序从1.5.6.release更新到2.3.5，但在生成项目时出现异常。下面是我的错误类：

  1. @Configuration
  2. @EnableBatchProcessing
  3. @Import({BatchScheduler.class})
  4. public class MyLogBatchConfiguration {
  6.   private static final Logger log = LoggerFactory.getLogger(MyLogBatchConfiguration.class);
  8.   @Autowired private SimpleJobLauncher jobLauncher;
  10.   @Autowired
  11.   @Qualifier(value = "dataSource1")
  12.   public DataSource mainDataSource;
  14.   @Autowired
  15.   @Qualifier(value = "dataSource2")
  16.   public DataSource tempDataSource;
  18.   @Autowired public StepBuilderFactory stepBuilderFactory;
  20.   @Autowired public JobBuilderFactory jobBuilderFactory;
  22.   @Autowired private RestTemplate myRestTemplate;
  24.   @Qualifier(value = "createLocalSessionFactory")
  25.   @Autowired
  26.   private SessionFactory createLocalSessionFactory;
  28.   @Qualifier(value = "createSessionFactory")
  29.   @Autowired
  30.   private SessionFactory createSessionFactory;
  32.   @Bean
  33.   RestTemplate restTemplate(RestTemplateBuilder builder) {
  34.     RestTemplate restTemplate = new RestTemplate();
  35.     List<HttpMessageConverter<?>> converters = restTemplate.getMessageConverters();
  36.     for (HttpMessageConverter<?> converter : converters) {
  37.       if (converter instanceof MappingJackson2HttpMessageConverter) {
  38.         MappingJackson2HttpMessageConverter jsonConverter =
  39.             (MappingJackson2HttpMessageConverter) converter;
  40.         jsonConverter.setObjectMapper(new ObjectMapper());
  41.         jsonConverter.setSupportedMediaTypes(
  42.             ImmutableList.of(
  43.                 new MediaType(
  44.                     "application", "json", MappingJackson2HttpMessageConverter.DEFAULT_CHARSET),
  45.                 new MediaType(
  46.                     "text", "javascript", MappingJackson2HttpMessageConverter.DEFAULT_CHARSET)));
  47.       }
  48.     }
  49.     return restTemplate;
  50.   }
  52.   @Bean
  53.   public LocalSessionFactoryBean createLocalSessionFactory(
  54.       @Qualifier("dataSource1") DataSource dataSource) {
  55.     LocalSessionFactoryBean factory = new LocalSessionFactoryBean();
  56.     factory.setDataSource(dataSource);
  57.     factory.setPackagesToScan(
  58.         new String[] {
  59.           "X",
  60.           "Y",
  61.           "Z"
  62.         });
  63.     factory.setHibernateProperties(hibernateProperties());
  64.     return factory;
  65.   }
  67.   @Bean
  68.   public LocalSessionFactoryBean createSessionFactory(
  69.       @Qualifier("dataSource2") DataSource dataSource) {
  70.     LocalSessionFactoryBean factory = new LocalSessionFactoryBean();
  71.     factory.setDataSource(dataSource);
  72.     factory.setPackagesToScan(
  73.         new String[] {
  74.           "X",
  75.           "Y",
  76.           "Z"
  77.         });
  78.     factory.setHibernateProperties(hibernateProperties());
  79.     return factory;
  80.   }

出现以下错误：

  1. > 
  2. org.springframework.beans.factory.UnsatisfiedDependencyException:
  3. > Error creating bean with name 'MyLogBatchConfiguration': Unsatisfied
  4. > dependency expressed through field 'myRestTemplate'; nested exception
  5. > is org.springframework.beans.factory.UnsatisfiedDependencyException:
  6. > Error creating bean with name 'batchConfiguration': Unsatisfied
  7. > dependency expressed through field 'myRestTemplate'; nested exception
  8. > is org.springframework.beans.factory.BeanCreationException: Error
  9. > creating bean with name 'restTemplate' defined in class path resource
  10. > [com//configuration/MyLogBatchConfiguration.class]: Bean instantiation
  11. > via factory method failed; nested exception is
  12. > org.springframework.beans.BeanInstantiationException: Failed to
  13. > instantiate [org.springframework.web.client.RestTemplate]: Circular
  14. > reference involving containing bean 'MyLogBatchConfiguration' -
  15. > consider declaring the factory method as static for independence from
  16. > its containing instance. Factory method 'restTemplate' threw
  17. > exception; nested exception is java.lang.NullPointerException at
  18. > org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643)
  19. > at
  20. > org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130)
  21. > at
  22. > org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
  23. > at
  24. > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1420)
  25. > at
  26. > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
  27. > at
  28. > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516)
  29. > at
  30. > org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324)
  31. > ] at
  32. > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  33. > at java.lang.reflect.Method.invoke(Method.java:498) at
  34. > org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
  35. > at org.springframework.boot.loader.Launcher.launch(Launcher.java:107)
  36. > at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
  37. > at
  38. > org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88)
  39. > Caused by:
  40. > org.springframework.beans.factory.UnsatisfiedDependencyException:
  41. > Error creating bean with name 'batchConfiguration': Unsatisfied
  42. > dependency expressed through field 'myRestTemplate'; nested exception
  43. > is org.springframework.beans.factory.BeanCreationException: Error
  44. > creating bean with name 'restTemplate' defined in class path resource
  45. > [com//configuration/MyLogBatchConfiguration.class]: Bean instantiation
  46. > via factory method failed; nested exception is
  47. > org.springframework.beans.BeanInstantiationException: Failed to
  48. > instantiate [org.springframework.web.client.RestTemplate]: Circular
  49. > reference involving containing bean 'MyLogBatchConfiguration' -
  50. > consider declaring the factory method as static for independence from
  51. > its containing instance. Factory method 'restTemplate' threw
  52. > exception; nested exception is java.lang.NullPointerException at
  53. > org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643)
  54. > at
  55. > org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130)
  56. > at
  57. > org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
  58. > at
  59. > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1420)
  60. > at
  61. > org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322)
  62. > at
  63. > org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
  64. > at
  65. > org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
  66. > at
  67. > org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1307)
  68. > at
  69. > org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227)
  70. > at
  71. > org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640)
  72. > ... 28 common frames omitted Caused by:
  73. > org.springframework.beans.factory.BeanCreationException: Error
  74. > creating bean with name 'restTemplate' defined in class path resource
  75. > [com/*/configuration/MyLogBatchConfiguration.class]: Bean
  76. > instantiation via factory method failed; nested exception is
  77. > org.springframework.beans.BeanInstantiationException: Failed to
  78. > instantiate [org.springframework.web.client.RestTemplate]: Circular
  79. > reference involving containing bean 'MyLogBatchConfiguration' -
  80. > consider declaring the factory method as static for independence from
  81. > its containing instance. Factory method 'restTemplate' threw
  82. > exception; nested exception is java.lang.NullPointerException at
  83. > org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:655)
  84. > at
  85. > org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:635)
  86. > at
  87. > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336)
  88. > at
  89. > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176)
  90. > at
  91. > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556)
  92. > at
  93. > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516)
  94. > at
  95. > org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1307)
  96. > at
  97. > org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227)
  98. > at
  99. > org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640)
  100. > ... 50 common frames omitted Caused by:
  101. > org.springframework.beans.BeanInstantiationException: Failed to
  102. > instantiate [org.springframework.web.client.RestTemplate]: Circular
  103. > reference involving containing bean 'MyLogBatchConfiguration' -
  104. > consider declaring the factory method as static for independence from
  105. > its containing instance. Factory method 'restTemplate' threw
  106. > exception; nested exception is java.lang.NullPointerException at
  107. > org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
  108. > at
  109. > org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650)
  110. > ... 63 common frames omitted Caused by:
  111. > java.lang.NullPointerException: null at
  112. > org.springframework.util.MimeType.(MimeType.java:143) at
  113. > org.springframework.http.MediaType.(MediaType.java:433)

为了保留重要的行，我省略了一些堆栈之间的跟踪。在1.5.6版本中运行良好。主要原因是最后一行，它与
mimetype.java媒体类型.java
并引发空指针异常。如何正确传递mediatypes？我确实在eclipse中看到一个警告：

  1. The field AbstractJackson2HttpMessageConverter.DEFAULT_CHARSET is 
  2.  deprecated

任何处理空媒体类型的解决方法都是值得赞赏的。

Javaspringspring-bootspring-restresttemplate

1条答案

按热度按时间
dxxyhpgq

dxxyhpgq1#

这是2.2.0 spring boot的问题。他们为默认字符集编码设置了弃用。
尝试用以下两种类型替换。json和文本，

  1. new MediaType("application", "json", MappingJackson2HttpMessageConverter. StandardCharsets.UTF_8))
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