sqoop2-1.99.2-cdh4.5.0在安装过程中遇到各种NoClassDefFoundError异常，例如:
Exception sending context initialized event to listener instance of class org.apache.sqoop.server.ServerInitializer
java.lang.NoClassDefFoundError: org/apache/commons/collections/map/UnmodifiableMap
at org.apache.hadoop.conf.Configuration$DeprecationContext.<init>(Configuration.java:386)
at org.apache.hadoop.conf.Configuration.<clinit>(Configuration.java:426)
at org.apache.sqoop.submission.mapreduce.MapreduceSubmissionEngine.initialize(MapreduceSubmissionEngine.java:78)
at org.apache.sqoop.framework.JobManager.initialize(JobManager.java:215)
at org.apache.sqoop.core.SqoopServer.initialize(SqoopServer.java:53)
at org.apache.sqoop.server.ServerInitializer.contextInitialized(ServerInitializer.java:36)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943)
at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.map.UnmodifiableMap
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
... 30 more
2014-3-19 10:03:19 org.apache.catalina.core.StandardContext listenerStop
严重: Exception sending context destroyed event to listener instance of class org.apache.sqoop.server.ServerInitializer
java.lang.NullPointerException
at org.apache.sqoop.framework.JobManager.destroy(JobManager.java:176)
at org.apache.sqoop.core.SqoopServer.destroy(SqoopServer.java:36)
at org.apache.sqoop.server.ServerInitializer.contextDestroyed(ServerInitializer.java:32)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4245)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4886)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4750)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943)
at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
解决办法:
将相应的jar放到server/webapps/sqoop/WEB-INF/lib下
sqoop2依赖的所有jar:
avro-1.7.4.jarcommons-cli-1.2.jar
commons-configuration-1.6.jar
commons-dbcp-1.4.jar
commons-lang-2.5.jar
commons-logging-1.1.1.jar
commons-pool-1.5.4.jar
derby-10.8.2.2.jar
guava-11.0.2.jar
hadoop-auth-2.0.0-cdh4.3.0.jar
hadoop-common-2.0.0-cdh4.3.0.jar
*hadoop-core-2.0.0-mr1-cdh4.3.0.jar*
hadoop-hdfs-2.0.0-cdh4.3.0.jar
hadoop-mapreduce-client-app-2.0.0-cdh4.3.0.jar
hadoop-mapreduce-client-common-2.0.0-cdh4.3.0.jar
hadoop-mapreduce-client-core-2.0.0-cdh4.3.0.jar
hadoop-mapreduce-client-jobclient-2.0.0-cdh4.3.0.jar
hadoop-yarn-api-2.0.0-cdh4.3.0.jar
hadoop-yarn-common-2.0.0-cdh4.3.0.jar
jackson-core-asl-1.8.8.jar
jackson-mapper-asl-1.8.8.jar
json-simple-1.1.jar
log4j-1.2.16.jar
MysqL-connector-java-5.1.25-bin.jar
protobuf-java-2.4.0a.jar
slf4j-api-1.6.1.jar
slf4j-log4j12-1.6.1.jar
sqoop-common-1.99.2.jar
sqoop-connector-generic-jdbc-1.99.2.jar
sqoop-core-1.99.2.jar
sqoop-execution-mapreduce-1.99.2-hadoop200.jar
sqoop-repository-derby-1.99.2.jar
sqoop-spi-1.99.2.jar
sqoop-submission-mapreduce-1.99.2-hadoop200.jar
原文链接：https://www.f2er.com/javaschema/285727.html