今天写了一段简单的java代码调用Hbase的API，代码如下：
public class HbaseApi {
private HTable hTable ;
private String tableName;
public HbaseApi(String tableName) throws IOException {
this.tableName = tableName;
HBaseConfiguration hconfig = new HBaseConfiguration();
hconfig.set("hbase.zookeeper.property.clientPort","2181");
hconfig.set("hbase.zookeeper.quorum", "192.168.179.130");
hTable = new HTable(hconfig, this.tableName.getBytes());
}
public void scan(String family, String qualifier) throws IOException {
Scan scan = new Scan();
scan.addColumn(family.getBytes(), qualifier.getBytes());
ResultScanner scanner = hTable.getScanner(scan);
for(Result result = scanner.next(); result != null; result = scanner.next() ) {
}
}
public static void main(String[] args) {
try {
new HbaseApi("teacher").scan("teacher", "info");;
} catch (IOException e) {
e.printStackTrace();
}
}
}
执行的时候出现错误：从错误上看，应该是Hbase的一个类重载了protobuf-java的一个final方法导致的。我使用hadoop的版本是2.2.0， Hbase版本是0.96，protobuf的版本是2.5.如有大神遇到相同的问题，请提供以下解决方法，再此谢过
java.io.IOException: java.lang.reflect.InvocationTargetException
at org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:389)
at org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:366)
at org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:247)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:188)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:165)
at com.hadoop.study.hbase.HbaseApi.<init>(HbaseApi.java:19)
at com.hadoop.study.hbase.HbaseApi.main(HbaseApi.java:34)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:387)
... 6 more
Caused by: java.lang.VerifyError: class org.apache.hadoop.hbase.protobuf.generated.ClientProtos$Result overrides final method getUnknownFields.()Lcom/google/protobuf/UnknownFieldSet;
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.<clinit>(ProtobufUtil.java:172)
at org.apache.hadoop.hbase.ClusterId.parseFrom(ClusterId.java:64)
at org.apache.hadoop.hbase.zookeeper.ZKClusterId.readClusterIdZNode(ZKClusterId.java:69)
at org.apache.hadoop.hbase.client.ZooKeeperRegistry.getClusterId(ZooKeeperRegistry.java:83)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.retrieveClusterId(HConnectionManager.java:801)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.<init>(HConnectionManager.java:633)
... 11 more