Question

我是Cassandra的新手，我正在尝试使用Eclipse中的以下程序创建一个列和超列系列：

import java.util.Arrays;
import java.util.List;

import me.prettyprint.cassandra.model.BasicColumnDefinition;
import me.prettyprint.cassandra.model.BasicColumnFamilyDefinition;
import me.prettyprint.cassandra.serializers.StringSerializer;
import me.prettyprint.cassandra.service.ThriftCfDef;
import me.prettyprint.hector.api.Cluster;
import me.prettyprint.hector.api.ddl.ColumnFamilyDefinition;
import me.prettyprint.hector.api.ddl.ColumnIndexType;
import me.prettyprint.hector.api.ddl.ColumnType;
import me.prettyprint.hector.api.ddl.ComparatorType;
import me.prettyprint.hector.api.ddl.KeyspaceDefinition;
import me.prettyprint.hector.api.exceptions.HectorException;
import me.prettyprint.hector.api.factory.HFactory;

public class HectorTutorial {

    private static final String TEST_KEYSPACE = "TestKeyspace";
    private static final String TEST_CF= "TestColumnFamily";
    private static final String TEST_SUPER= "TestSuperColumn";

    private static StringSerializer stringSerializer = StringSerializer.get();

    public static void main(String[] args) throws Exception {

        Cluster cluster = HFactory.getOrCreateCluster("TestCluster", "localhost:9160");

        try {
            if ( cluster.describeKeyspace(TEST_KEYSPACE ) != null ) {
              cluster.dropKeyspace(TEST_KEYSPACE );
            }

            BasicColumnDefinition columnDefinition = new BasicColumnDefinition();
            columnDefinition.setName(stringSerializer.toByteBuffer("TestColumn"));
            columnDefinition.setIndexName("TestColumn_idx ");
            columnDefinition.setIndexType(ColumnIndexType.KEYS);
            columnDefinition.setValidationClass(ComparatorType.LONGTYPE.getClassName());

            BasicColumnFamilyDefinition columnFamilyDefinition = new BasicColumnFamilyDefinition();
            columnFamilyDefinition.setKeyspaceName(TEST_KEYSPACE );
            columnFamilyDefinition.setName(TEST_CF);
            columnFamilyDefinition.addColumnDefinition(columnDefinition);

            BasicColumnFamilyDefinition superCfDefinition = new BasicColumnFamilyDefinition();
            superCfDefinition.setKeyspaceName(TEST_KEYSPACE );
            superCfDefinition.setName(TEST_SUPER);
            superCfDefinition.setColumnType(ColumnType.SUPER);

            ColumnFamilyDefinition cfDefStandard = new ThriftCfDef(columnFamilyDefinition);
            ColumnFamilyDefinition cfDefSuper = new ThriftCfDef(superCfDefinition);

            KeyspaceDefinition keyspaceDefinition = 
                HFactory.createKeyspaceDefinition(TEST_KEYSPACE , "org.apache.cassandra.locator.SimpleStrategy", 
                    1, Arrays.asList(cfDefStandard, cfDefSuper));

            cluster.addKeyspace(keyspaceDefinition);

           /* Below Code show your Keyspace Schema */

            List<KeyspaceDefinition> keyspaces = cluster.describeKeyspaces();
            for (KeyspaceDefinition kd : keyspaces) {
                if ( kd.getName().equals(TEST_KEYSPACE ) ) {
                    System.out.println("Name: " +kd.getName());
                    System.out.println("RF: " +kd.getReplicationFactor());
                    System.out.println("strategy class: " +kd.getStrategyClass());
                    List<ColumnFamilyDefinition> cfDefs = kd.getCfDefs();
                    for (ColumnFamilyDefinition def : cfDefs) {
                      System.out.println("  CF Type: " +def.getColumnType());
                      System.out.println("  CF Name: " +def.getName());
                      System.out.println("  CF Metadata: " +def.getColumnMetadata());  
                    }                                        
                } 
            }                        
        } catch (HectorException he) {
            he.printStackTrace();
        }
        cluster.getConnectionManager().shutdown(); 
    }
}

当我尝试执行程序时，我得到以下异常：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/thrift/transport/TTransportException
    at me.prettyprint.cassandra.connection.factory.HThriftClientFactoryImpl.createClient(HThriftClientFactoryImpl.java:28)
    at me.prettyprint.cassandra.connection.ConcurrentHClientPool.createClient(ConcurrentHClientPool.java:147)
    at me.prettyprint.cassandra.connection.ConcurrentHClientPool.<init>(ConcurrentHClientPool.java:53)
    at me.prettyprint.cassandra.connection.RoundRobinBalancingPolicy.createConnection(RoundRobinBalancingPolicy.java:67)
    at me.prettyprint.cassandra.connection.HConnectionManager.<init>(HConnectionManager.java:67)
    at me.prettyprint.cassandra.service.AbstractCluster.<init>(AbstractCluster.java:67)
    at me.prettyprint.cassandra.service.ThriftCluster.<init>(ThriftCluster.java:21)
    at me.prettyprint.hector.api.factory.HFactory.createCluster(HFactory.java:197)
    at me.prettyprint.hector.api.factory.HFactory.getOrCreateCluster(HFactory.java:144)
    at me.prettyprint.hector.api.factory.HFactory.getOrCreateCluster(HFactory.java:133)
    at HectorTutorial.main(HectorTutorial.java:27)
Caused by: java.lang.ClassNotFoundException: org.apache.thrift.transport.TTransportException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)

我在类路径中包含了所有Hector api jar，但我不知道导致此错误的原因。有人可以解释错误的原因吗？

Answer 1

您似乎错过了一些第三方库（在这种情况下，我认为Thrift包含TTransportException类）。将所有必需的库添加到类路径中，让我们看看是否有帮助。

Answer 2

检查你的＆＃34;运行/调试配置＆＃34;根据设置。确定＆＃34;主要班级的名称＆＃34;您正在使用。单击以选择当前类的名称。应用。确定。

线程“main”中的异常java.lang.NoClassDefFoundError：org / apache / thrift / transport / TTransportException

2 个答案: