Caused by: java.lang.NoClassDefFoundError: org/apache/htrace/Trace

在整合flume + kafka + storm + hbase 时，出现

java.lang.ClassNotFoundException: org.apache.hadoop.hbase.HBaseConfiguration

起初从网上搜到俩个解决方法

1、在hadoop-env.sh 加了下面那句

2、在hadoop的lib下加了hbase-common-1.3.1.jar

但还是报错

后来又把这几个jar拷贝到storm/lib 下，又出现一下错误

Exception in thread "main" java.io.IOException: java.lang.reflect.InvocationTargetException at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:240) at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:218) at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:119) at demo.myconnection.main(myconnection.java:41) 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:606) at org.apache.hadoop.util.RunJar.run(RunJar.java:221) at org.apache.hadoop.util.RunJar.main(RunJar.java:136) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:238) ... 9 more Caused by: java.lang.NoClassDefFoundError: org/apache/htrace/Trace at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:217) at org.apache.hadoop.hbase.zookeeper.ZKUtil.checkExists(ZKUtil.java:419) at org.apache.hadoop.hbase.zookeeper.ZKClusterId.readClusterIdZNode(ZKClusterId.java:65) at org.apache.hadoop.hbase.client.ZooKeeperRegistry.getClusterId(ZooKeeperRegistry.java:105) at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.retrieveClusterId(ConnectionManager.java:919) at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.<init>(ConnectionManager.java:657) ... 14 more Caused by: java.lang.ClassNotFoundException: org.apache.htrace.Trace

从根源来说，以上故障都是因为执行时找不到对应的hbase jar包引起的。

那么解决思路有两条：

1. 手动copy缺失的jar包

拷贝 hbase/lib 下 hbase*.jar,metrics*.jar.htrace*.jar 复制到 storm/lib/ 下

2. 设置classpath环境变量

执行

export HBASE_CLASSPATH=`hbase classpath`

export HADOOP_CLASSPATH=`hadoop classpath`

exportHADOOP_CLASSPATH=$HADOOP_CLASSPATH:$HBASE_CLASSPATH