我正在尝试使用Java（Hadoop2）连接到Cassandra，但出现以下错误：
Connecting to IP Address 127.0.0.1:9042...
16/04/12 10:35:13 INFO core.NettyUtil: Found Netty's native epoll transport in the classpath, using it
Exception in thread "main" java.lang.NoSuchMethodError: com.google.common.util.concurrent.Futures.withFallback(Lcom/google/common /util/concurrent/ListenableFuture;Lcom/google/common/util/concurrent /FutureFallback;Ljava/util/concurrent/Executor;)Lcom/google/common/util/concurrent/ListenableFuture;
at com.datastax.driver.core.Connection.initAsync(Connection.java:177)
at com.datastax.driver.core.Connection$Factory.open(Connection.java:731)
at com.datastax.driver.core.ControlConnection.tryConnect(ControlConnection.java:251)
at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:199)
at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:77)
at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1414)
at com.datastax.driver.core.Cluster.getMetadata(Cluster.java:393)
at cassandra.CassandraConnector.connect(CassandraConnector.java:42)
at cassandra.Main.main(Main.java:20)
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)
请查看cassandra环境细节： - 已连接到位于127.0.0.1:9042的Test Cluster。 - [cqlsh 5.0.1 | Cassandra 2.2.5 | CQL spec 3.3.1 | Native protocol v4]
我正在使用以下Jars： - cassandra-driver-core-3.0.0.jar - guava-19.0.jar - netty-all-4.1.0.CR7.jar 我尝试过其他Jars（guava >=16.01，netty-all-4.0...，cassandra-driver-core-2.2.0），但总是会抛出类似的错误。
请参见下面用于建立连接的代码片段：
public void connect(final String node, final int port)
{
this.cluster = Cluster.builder().addContactPoint(node).withPort(port)
.build();
final Metadata metadata = cluster.getMetadata();
ProtocolVersion myCurrentVersion = cluster.getConfiguration()
.getProtocolOptions()
.getProtocolVersion();
System.out.println(myCurrentVersion);
out.printf("Connected to cluster: %s\n", metadata.getClusterName());
for (final Host host : metadata.getAllHosts())
{
out.printf("Datacenter: %s; Host: %s; Rack: %s\n",
host.getDatacenter(), host.getAddress(), host.getRack());
}
session = cluster.connect();
}
public static void main(String[] args) {
// TODO Auto-generated method stub
final CassandraConnector client = new CassandraConnector();
final String ipAddress = args.length > 0 ? args[0] : "127.0.0.1";
final int port = args.length > 1 ? Integer.parseInt(args[1]) : 9042;
out.println("Connecting to IP Address " + ipAddress + ":" + port + "...");
client.connect(ipAddress, port);
client.close();
}
我认为这可能是由于某个版本冲突，但无法找到正确的版本。 已经检查了一些类似的帖子并尝试了解决方案（使用不同的jar包），但无法解决问题。 非常感谢任何帮助。