Spring Rest 应用程序未启动（NullPointerException）

Question

这是 API 所在的存储库的链接：

https://github.com/moreiravictor/postAPI

控制台向我打印以下错误：

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/ruivoo/.m2/repository/ch/qos/logback/logback-classic/1.1.3/logback-classic-1.1.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/ruivoo/.m2/repository/org/slf4j/slf4j-simple/1.7.7/slf4j-simple-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
Exception in thread "main" java.lang.NullPointerException
    at org.springframework.core.BridgeMethodResolver.findBridgedMethod(BridgeMethodResolver.java:64)
    at org.springframework.beans.GenericTypeAwarePropertyDescriptor.<init>(GenericTypeAwarePropertyDescriptor.java:70)
    at org.springframework.beans.CachedIntrospectionResults.buildGenericTypeAwarePropertyDescriptor(CachedIntrospectionResults.java:348)
    at org.springframework.beans.CachedIntrospectionResults.<init>(CachedIntrospectionResults.java:302)
    at org.springframework.beans.CachedIntrospectionResults.forClass(CachedIntrospectionResults.java:189)
    at org.springframework.beans.BeanUtils.getPropertyDescriptors(BeanUtils.java:359)
    at org.springframework.boot.bind.PropertiesConfigurationFactory.getNames(PropertiesConfigurationFactory.java:263)
    at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:252)
    at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:227)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.bindToSpringApplication(ConfigFileApplicationListener.java:196)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:147)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:139)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:127)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:151)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:128)
    at org.springframework.boot.context.event.EventPublishingRunListener.publishEvent(EventPublishingRunListener.java:100)
    at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:59)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:286)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:969)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:958)
    at br.com.espatodea.postAPI.App.main(App.java:9)

Answer 1

存在 SLF4J 版本冲突，堆栈跟踪清楚地解释了这一点。第 4 行说：

SLF4J：请参阅 http://www.slf4j.org/codes.html#multiple_bindings 了解说明。

提供的解决方案之一是从 Lombok 中排除 SLF4J：

<exclusions>
  <exclusion> 
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
  </exclusion>
  <exclusion> 
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
  </exclusion>
</exclusions> 

但是，我看到其中一个依赖项是明确的 /org/slf4j/slf4j-simple/1.7.7，所以我会删除这个。