Question

我有一个maven项目A

项目的pom.xml A：

<dependencies>
       <dependency> 
            <groupId>com.app.cops</groupId>
            <artifactId>cassandra-logging</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
</dependencies>

项目的pom.xml cassandra-logging：

<dependencies>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty</artifactId>
            <version>3.9.0.Final</version>
        </dependency>
        <dependency>
            <groupId>com.codahale.metrics</groupId>
            <artifactId>metrics-core</artifactId>
            <version>3.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.5</version>
        </dependency>
        <dependency>
            <groupId>com.datastax.cassandra</groupId>
            <artifactId>cassandra-driver-core</artifactId>
            <version>3.0.0</version>
        </dependency>   
        <dependency>
            <groupId>com.datastax.cassandra</groupId>
            <artifactId>cassandra-driver-mapping</artifactId>
            <version>3.0.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>19.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.3.1</version>
        </dependency>
  </dependencies>

cops-logging项目具有以下代码：

CassandraCopsComponentLogger.instance = new CassandraCopsComponentLogger();

                String hosts = CassandraClientUtil.getHost();
                String localDC = CassandraClientUtil.getLocalDC();
                Cluster cluster;
                if (StringUtils.isNotEmpty(localDC))
                {
                    cluster = Cluster.builder().addContactPoints(hosts.split(","))
                            .withCredentials(CassandraCopsComponentLogger.USER_NAME, CassandraCopsComponentLogger.AUTH_CODE)
                            .withQueryOptions(new QueryOptions().setConsistencyLevel(ConsistencyLevel.LOCAL_ONE))
                            .withLoadBalancingPolicy(new TokenAwarePolicy(DCAwareRoundRobinPolicy.builder().withLocalDc(localDC).build())).build();
                }
                else
                {
                    cluster = Cluster.builder().addContactPoints(hosts.split(","))
                            .withCredentials(CassandraCopsComponentLogger.USER_NAME, CassandraCopsComponentLogger.AUTH_CODE)
                            .withQueryOptions(new QueryOptions().setConsistencyLevel(ConsistencyLevel.LOCAL_ONE)).build();
                }

                Session session = cluster.connect();
                CassandraCopsComponentLogger.mappingManager = new MappingManager(session);

我继续在以下一行获得例外：

cluster = Cluster.builder().addContactPoints(hosts.split(","))

我在cassandra-logging项目中进行了单元测试，该代码可以正常运行。但是当我从项目A调用相同的代码时，我得到了

java.lang.NoClassDefFoundError: Could not initialize class com.datastax.driver.core.Cluster

Answer 1

我能够通过将cassandra依赖版本降级为<version>2.1.9</version>来解决此问题。不知道这有多大帮助，但我能够继续前进。

Answer 2

将cassandra-driver-core和cassandra-driver-mapping的版本更新到3.3.0 - 这对我有用：

        <dependency>
            <groupId>com.datastax.cassandra</groupId>
            <artifactId>cassandra-driver-core</artifactId>
            <version>3.3.0</version>
        </dependency>   
        <dependency>
            <groupId>com.datastax.cassandra</groupId>
            <artifactId>cassandra-driver-mapping</artifactId>
            <version>3.3.0</version>
        </dependency>

Answer 3

我遇到了类似的问题。我得到的错误是：

Factory method 'sqlSession' threw exception; 
nested exception is java.lang.NoClassDefFoundError: com/datastax/oss/protocol/internal/SegmentCodec

java.lang.NoClassDefFoundError：无法初始化类com.datastax.driver.core.Cluster

3 个答案: