Java调用Hbase

遇到的问题

1、java调用hbase时(hbase0.96)报以下错误：

Exception in thread "main" java.io.IOException: java.lang.reflect.InvocationTargetException
	at org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:383)
	at org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:360)
	at org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:244)
	at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:187)
	at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:149)
	at Test.add(Test.java:46)
	at Test.main(Test.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:381)
	... 6 more
Caused by: java.lang.VerifyError: class org.apache.hadoop.hbase.protobuf.generated.ClusterIdProtos$ClusterId overrides final method getUnknownFields.()Lcom/google/protobuf/UnknownFieldSet;
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
	at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
	at org.apache.hadoop.hbase.ClusterId.parseFrom(ClusterId.java:66)
	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$HConnectionImplementation.retrieveClusterId(HConnectionManager.java:794)
	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.<init>(HConnectionManager.java:627)
	... 11 more

原因是protobuf的版本不一致造成的。之前使用的是hbase0.94.12的包，在我的测试工程里有了protobuf-java-2.4.jar，而改到hbase0.96后，Hbase0.96依赖的是protobuf-java-2.5.jar。修改后就可以正常跑了。