Storm 本地调试报 NoClassDefFoundError: org/apache/storm/topology/IRichSpout

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本文解决了一个在Apache Storm本地调试中遇到的问题，即java.lang.NoClassDefFoundError异常，具体针对org/apache/storm/topology/IRichSpout类。问题的根源在于依赖范围设置不当，通过修改pom.xml文件中的依赖项，将storm-core从提供的范围(provided)更改为默认范围(default)，成功解决了错误。

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https://blog.iaiot.com/storm-no-IRichSpout.html

Storm 本地调试报 java.lang.NoClassDefFoundError: org/apache/storm/topology/IRichSpout

java.lang.NoClassDefFoundError: org/apache/storm/topology/IRichSpout
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
	at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
	at java.lang.Class.getMethod0(Class.java:3018)
	at java.lang.Class.getMethod(Class.java:1784)
	at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.apache.storm.topology.IRichSpout
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 7 more
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main"

pom.xml 中去掉 <scope>provided</scope> 即可

<dependency>
    <groupId>org.apache.storm</groupId>
    <artifactId>storm-core</artifactId>
    <version>1.2.2</version>
    <!--<scope>provided</scope>-->
</dependency>

Maven Dependency Scope：http://uule.iteye.com/blog/2087485