HBase出现java.lang.NoClassDefFoundError: org/apache/hadoop/hbase/HBaseConfiguration问题

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hbase程序报错：java.lang.ClassNotFoundException: org.apache.hadoop.hbase.client.Scan 根据报错返回的日志内容，可以看出，大致是我们在使用MapReduce去执行hhbase程序时，未找到类：org.apache.hadoop.hbase.client.Scan。我们只需要将hbase的jar包引用到hadoop的jar包中即可，亦或者我们执行程序前声明一下hadoop的类路径指向hbase的jar包位置。本地编写hbase程序后，maven生成jar包，提交到测试环境，使用MapReduce执行时，不管采取了以上哪两种方式，处理之后，再次提交hbase程序，就不会有报错了。阅读详情

AI摘要

本文介绍如何使用Java API在HBase中创建表，并解决在集群环境中遇到的NoClassDefFoundError错误。通过正确配置Hadoop classpath并添加必要的HBase JAR包，确保应用程序能在集群上顺利运行。

问题：Hbase在集群上运行报错：NoClassDefFoundError:org/apache/hadoop/hbase/HBaseConfiguration
需求：HBase使用Java创建表，打包成jar，提交到集群上行运行！
在IDEA中使用Maven添加Hbase
代码：

 <dependency>
            <groupId>org.apache.hbase</groupId>
            <artifactId>hbase-it</artifactId>
            <version>1.1.3</version>
 </dependency>

Java代码：

package com.bynear.HBase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import java.io.IOException;
/**
 * 2018/6/20
 * 15:35
 */
public class HBaseTest {
    public static void main(String[] args) throws Exception {
        Configuration conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "Spark1:2181,Spark2:2181");
        HBaseAdmin admin = new HBaseAdmin(conf);
        TableName name = TableName.valueOf("nvshen");
        HTableDescriptor desc = new HTableDescriptor(name);
        HColumnDescriptor base_info = new HColumnDescriptor("base_info");
        HColumnDescriptor extra_info = new HColumnDescriptor("extra_info");
        base_info.setMaxVersions(5);
        extra_info.setMaxVersions(5);
        desc.addFamily(base_info);
        desc.addFamily(extra_info);
        admin.createTable(desc);
    }
}

打包提价到集群上：

 hadoop jar /root/SparkStudy.jar com/bynear/HBase/HBaseTest

结果出现如下报错！

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/hbase/HBaseConfiguration
        at com.bynear.HBase.HBaseTest.main(HBaseTest.java:19)
        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.main(RunJar.java:212)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.HBaseConfiguration
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 6 more

解决办法：
把hbase的jar包加入到hadoop classpath中
在hadoop安装目录下找到hadoop-env.sh文件，
添加 : export HADOOP_CLASSPATH=/home/hadoop/apps/hbase/lib/*
不需要重启，重新执行命令hadoop jar mapreducehbase.jar hbase.TxHBase 运行成功。

HBase的安装！
tar -zxvf hbase.tar -C 到指定的目录
vim hbase-env.sh
添加 JAVA_HOME 将自导的Zookeeper 修改为flase
vim hbase-site.xml

<configuration>
<property>
//添加HDFS的路径（自动创建）
        <name>hbase.rootdir</name>
        <value>hdfs://Spark1:9000/hbase</value>
</property>
<property>
//是否启用分布式
        <name>hbase.cluster.distributed</name>
        <value>true</value>
</property>
<property>
//配置zookeeper
        <name>hbase.zookeeper.quorum</name>
        <value>Spark1:2181,Spark2:2181</value>
</property>
</configuration>

注意：
需要将 Hadoop 的 hdfs-site.xml 和 core-site.xml 拷贝到Hbase的conf目录中，因为HBase集群是依赖于Hadoop集群的，HBase的region产生的HFile，存储在hbase-site.xml中创建的HDFS指定的目录中！
执行结果：

18/06/21 01:01:36 INFO zookeeper.ZooKeeper: Client environment:java.library.path=/root/app/hadoop-2.5.0-cdh5.3.6/lib/native
18/06/21 01:01:36 INFO zookeeper.ZooKeeper: Client environment:java.io.tmpdir=/tmp
18/06/21 01:01:36 INFO zookeeper.ZooKeeper: Client environment:java.compiler=<NA>
18/06/21 01:01:36 INFO zookeeper.ZooKeeper: Client environment:os.name=Linux
18/06/21 01:01:36 INFO zookeeper.ZooKeeper: Client environment:os.arch=i386
18/06/21 01:01:36 INFO zookeeper.ZooKeeper: Client environment:os.version=2.6.32-431.el6.x86_64
18/06/21 01:01:36 INFO zookeeper.ZooKeeper: Client environment:user.name=root
18/06/21 01:01:36 INFO zookeeper.ZooKeeper: Client environment:user.home=/root
18/06/21 01:01:36 INFO zookeeper.ZooKeeper: Client environment:user.dir=/root
18/06/21 01:01:36 INFO zookeeper.ZooKeeper: Initiating client connection, connectString=Spark1:2181,Spark2:2181 sessionTimeout=90000 watcher=hconnection-0xcb18130x0, quorum=Spark1:2181,Spark2:2181, baseZNode=/hbase
18/06/21 01:01:36 INFO zookeeper.ClientCnxn: Opening socket connection to server Spark1/192.168.2.15:2181. Will not attempt to authenticate using SASL (unknown error)
18/06/21 01:01:36 INFO zookeeper.ClientCnxn: Socket connection established, initiating session, client: /192.168.2.15:47408, server: Spark1/192.168.2.15:2181
18/06/21 01:01:36 INFO zookeeper.ClientCnxn: Session establishment complete on server Spark1/192.168.2.15:2181, sessionid = 0x641d2794760039, negotiated timeout = 40000
18/06/21 01:01:40 INFO client.HBaseAdmin: Created nvshen

运行结果：

hbase(main):001:0> list
TABLE                                                                                                                                
nvshen                                                                                                                               
1 row(s) in 0.4150 seconds

=> ["nvshen"]
hbase(main):002:0>

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#HBase #java.lang.NoClassDefFoundError #java.lang.NoSuchMethodError: o