intellij idea用的是ideaIU-2017.1.4 。spring boot用的是2.10
出现错误
ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...
Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/classic/Level
at org.springframework.boot.logging.logback.LogbackLoggingSystem.<clinit>(LogbackLoggingSystem.java:70)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.springframework.boot.logging.LoggingSystem.get(LoggingSystem.java:170)
at org.springframework.boot.logging.LoggingSystem.lambda$get$1(LoggingSystem.java:161)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
at java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet.lambda$entryConsumer$0(Collections.java:1575)
at java.util.Spliterators$IteratorSpliterator.tryAdvance(Spliterators.java:1812)
at java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$UnmodifiableEntrySetSpliterator.tryAdvance(Collections.java:1594)
at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)
at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:498)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464)
at org.springframework.boot.logging.LoggingSystem.get(LoggingSystem.java:161)
at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:216)
at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:196)
增加 log4j-core 后也不行 ，控制台就会出现
Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/classic/Level
错误。
后来我用 spring boot用的是1.56 就不会出现这个问题，正常运行
最后重新安装了ideaIU-2018.2.6 ，在用spring boot 2.10就没问题了