I am new to HBase, I copied a sample java code from the internet, but I meet an error "Cannot resolve symbol hbase" when building this sample. I use Gradle to build this sample project and Intellij as IDE. The HBase server is a remoter server and I try to write a put sample at my windows laptop to test the HBase, but I am not familiar with HBase and Gradle, could someone suggest what I have missed? Here is my code
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;
public class PutHbaseClient {
public static void main(String[] args) throws IOException {
Configuration conf = HBaseConfiguration.create();
Connection connection = ConnectionFactory.createConnection(conf);
Table table = connection.getTable(TableName.valueOf("test"));
try {
/*
* Put operations for a single row. To perform a
* Put, instantiate a Put object with the row to insert to and for
* each column to be inserted, execute addcolumn.
*/
Put put1 = new Put(Bytes.toBytes("row1"));
Put put2 = new Put(Bytes.toBytes("row2"));
Put put3 = new Put(Bytes.toBytes("row3"));
put1.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("qual1"),
Bytes.toBytes("ValueOneForPut1Qual1"));
put2.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("qual1"),
Bytes.toBytes("ValueOneForPut2Qual1"));
put3.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("qual1"),
Bytes.toBytes("ValueOneForPut2Qual1"));
put1.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("qual2"),
Bytes.toBytes("ValueOneForPut1Qual2"));
put2.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("qual2"),
Bytes.toBytes("ValueOneForPut2Qual2"));
put3.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("qual2"),
Bytes.toBytes("ValueOneForPut3Qual3"));
table.put(put1);
table.put(put2);
table.put(put3);
} finally {
table.close();
connection.close();
}
}
}
Here is my build.gradle
plugins {
id 'java'
}
group 'gid'
version '1.0-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile group: 'org.apache.hadoop', name: 'hadoop-common', version:'2.7.3'
testCompile group: 'junit', name: 'junit', version: '4.12'
}
According to a JAR finder site, the org.apache.hadoop.hbase.TableName
class is in the hbase-common JAR file.
That means that the dependency that you have in your build.gradle file should work. However, I don't think that the version number is correct. The most recent 2.x version in Maven Central is 2.2.2. (And 3.0.0-SNAPSHOT is not there ... naturally ... because Maven Central doesn't host SNAPSHOT artifacts!)
However, I recommend that you do what the HBase Documentation says (here):
"For Java applications using Maven, including the
hbase-shaded-client
module is the recommended dependency when connecting to a cluster."
The corresponding Gradle dependency is:
// https://mvnrepository.com/artifact/org.apache.hbase/hbase-shaded-client
compile group: 'org.apache.hbase', name: 'hbase-shaded-client', version: '2.2.2'
I am not familiar with Gradle, but I expect that there was another error message saying that it couldn't resolve the dependency for hbase-common version 2.7.3.
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