spark报错jjava.lang.NoClassDefFoundError: org/slf4j/spi/LoggerFactoryBinder

完整错误

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/spi/LoggerFactoryBinder
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	at org.apache.spark.internal.Logging$class.initializeLogging(Logging.scala:111)
	at org.apache.spark.internal.Logging$class.initializeLogIfNecessary(Logging.scala:102)
	at org.apache.spark.SparkContext.initializeLogIfNecessary(SparkContext.scala:73)
	at org.apache.spark.internal.Logging$class.log(Logging.scala:46)
	at org.apache.spark.SparkContext.log(SparkContext.scala:73)
	at org.apache.spark.internal.Logging$class.logInfo(Logging.scala:54)
	at org.apache.spark.SparkContext.logInfo(SparkContext.scala:73)
	at org.apache.spark.SparkContext.<init>(SparkContext.scala:184)
	at org.apache.spark.SparkContext$.getOrCreate(SparkContext.scala:2518)
	at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:918)
	at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:910)
	at scala.Option.getOrElse(Option.scala:121)
	at org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:910)
	at com.whdcone.spark.SparkETL$.main(SparkETL.scala:23)
	at com.whdcone.spark.SparkETL.main(SparkETL.scala)
Caused by: java.lang.ClassNotFoundException: org.slf4j.spi.LoggerFactoryBinder
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	... 27 more

解决方法：
看情况，如果不是spark的项目报这个错误则是slf4j的jar没有加载完全的错误，请加载三个slf4j.jar依赖。版本自选。

<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.22</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.22</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>1.7.22</version>
</dependency>

如果是spark的程序报错，则是spark和slf4j的兼容问题。
spark内部自带有slf4j，比如spark2.2.0中就含有1.7.5的slf4j
如果你有自己引入的slf4j则会优先使用自己引用的版本，有可能造成版本不兼容。
或者有可能你在引用slf4j的时候选择了provided
这样也会引起找不到slf4j的方法。

		<!-- 错误示例 -->
      <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>${slf4j.version}</version>
        <scope>provided</scope>
      </dependency>

解决方法：删除provided试试。

		<!-- 错误示例 -->
      <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>${slf4j.version}</version>
      </dependency>

正常不再报错了