无法让 Cassandra 在基本应用程序中工作答案

【问题标题】：Unable to get Cassandra to Work in Basic Applcation无法让 Cassandra 在基本应用程序中工作
【发布时间】：2015-02-16 12:28:42
【问题描述】：

这是我当前的错误：

com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /127.0.0.1 (com.datastax.driver.core.TransportException: [/127.0.0.1] Unexpected exception triggered (java.lang.NoClassDefFoundError: Could not initialize class com.datastax.driver.core.Codec)))
    com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:186)
    com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:81)
    com.datastax.driver.core.Cluster$Manager.init(Cluster.java:773)
    com.datastax.driver.core.Cluster$Manager.access$100(Cluster.java:706)
    com.datastax.driver.core.Cluster.<init>(Cluster.java:79)
    com.datastax.driver.core.Cluster.<init>(Cluster.java:66)
    com.datastax.driver.core.Cluster$Builder.build(Cluster.java:687)
    com.t2.claims.persistence.CassandraClient.getOrCreateCluster(CassandraClient.java:12)
    com.t2.claims.persistence.CassandraClient.getOrCreateSession(CassandraClient.java:18)
    com.t2.claims.dao.AlertDaoImpl.findAll(AlertDaoImpl.java:25)
    com.t2.claims.controllers.AlertIndexController.doAfterCompose(AlertIndexController.java:36)
    org.zkoss.zk.ui.impl.UiEngineImpl.doAfterCompose(UiEngineImpl.java:529)
    ....

我觉得我正在导入我的 pom.xml 中我需要的每一个可用的人工制品（以及我不想尝试解决这个问题的许多人工制品）。

我就是不明白为什么这不起作用？

为了完整起见，这是我的pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.t2.claims</groupId>
<artifactId>T2ClaimsPortal</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>T2ClaimsPortal</name>

<properties>
    <spring.version>3.2.0.RELEASE</spring.version>
    <zk.version>6.0.2.1</zk.version>
    <commons-lang.version>2.4</commons-lang.version>
    <commons-fileupload.version>1.2.1</commons-fileupload.version>
    <commons-io.version>1.3.1</commons-io.version>
    <commons-logging.version>1.1.1</commons-logging.version>
</properties>

<repositories>
    <repository>
        <id>spring-milestone</id>
        <name>Spring Maven MILESTONE Repository</name>
        <url>http://maven.springframework.org/milestone</url>
    </repository>

    <repository>
        <id>ZK EE</id>
        <url>https://maven.zkoss.org/repo/zk/ee/</url>
    </repository>
</repositories>


<dependencies>

    <!-- Hector -->

    <dependency>
        <groupId>me.prettyprint</groupId>
        <artifactId>hector-core</artifactId>
        <version>0.8.0-2</version>
    </dependency>

    <!-- cassandra -->

    <dependency>
        <groupId>com.datastax.cassandra</groupId>
        <artifactId>cassandra-driver-core</artifactId>
        <version>1.0.4</version>
    </dependency>

    <!-- cassandra dependencies -->

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.5.5</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.5.5</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava</artifactId>
        <version>14.0.1</version>
    </dependency>
    <dependency>
        <groupId>com.yammer.metrics</groupId>
        <artifactId>metrics-core</artifactId>
        <version>2.2.0</version>
    </dependency>
    <dependency>
        <groupId>io.netty</groupId>
        <artifactId>netty</artifactId>
        <version>3.7.0.Final</version>
    </dependency>
    <dependency>
        <groupId>org.apache.cassandra</groupId>
        <artifactId>cassandra-all</artifactId>
        <version>1.2.9</version>
    </dependency>
    <dependency>
        <groupId>org.apache.thrift</groupId>
        <artifactId>libthrift</artifactId>
        <version>0.7.0</version>
    </dependency>
    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-core-asl</artifactId>
        <version>1.9.2</version>
    </dependency>
    <dependency>
        <groupId>org.testng</groupId>
        <artifactId>testng</artifactId>
        <version>6.8.1</version>
    </dependency>

    <!-- spring framework -->

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-expression</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-oxm</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc-portlet</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.integration</groupId>
        <artifactId>spring-integration-core</artifactId>
        <version>2.2.6.RELEASE</version>
    </dependency>

    <!-- ZK -->

    <dependency>
        <groupId>org.zkoss.zk</groupId>
        <artifactId>zkplus</artifactId>
        <version>${zk.version}</version>
    </dependency>
    <dependency>
        <groupId>org.zkoss.zk</groupId>
        <artifactId>zkspring-core</artifactId>
        <version>3.1</version>
    </dependency>
    <dependency>
        <groupId>org.zkoss.theme</groupId>
        <artifactId>sapphire</artifactId>
        <version>${zk.version}</version>
    </dependency>
    <dependency>
        <groupId>org.zkoss.zk</groupId>
        <artifactId>zul</artifactId>
        <version>${zk.version}</version>
    </dependency>
    <dependency>
        <groupId>org.zkoss.common</groupId>
        <artifactId>zcommon</artifactId>
        <version>${zk.version}</version>
    </dependency>
    <dependency>
        <groupId>org.zkoss.zk</groupId>
        <artifactId>zk</artifactId>
        <version>${zk.version}</version>
    </dependency>
    <dependency>
        <groupId>org.zkoss.common</groupId>
        <artifactId>zweb</artifactId>
        <version>${zk.version}</version>
    </dependency>

    <!-- ZK dependencies -->

    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
        <version>${commons-logging.version}</version>
    </dependency>
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>${commons-fileupload.version}</version>
    </dependency>
    <dependency>
        <groupId>commons-lang</groupId>
        <artifactId>commons-lang</artifactId>
        <version>${commons-lang.version}</version>
    </dependency>
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>${commons-io.version}</version>
    </dependency>
    <dependency>
        <groupId>commons-collections</groupId>
        <artifactId>commons-collections</artifactId>
        <version>3.2.1</version>
    </dependency>
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
        <version>1.7</version>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-io</artifactId>
        <version>1.3.2</version>
    </dependency>
    <dependency>
        <groupId>commons-configuration</groupId>
        <artifactId>commons-configuration</artifactId>
        <version>1.6</version>
        <type>jar</type>
        <scope>compile</scope>
    </dependency>

    <!-- javax servlet -->

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
    </dependency>

    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.1</version>
        <scope>provided</scope>
    </dependency>

    <!-- ***************************************************************************** -->
    <!-- ************************** JACKSON ****************************************** -->
    <!-- ***************************************************************************** -->
    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>1.9.10</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.0.2</version>
    </dependency>

    <dependency>
        <groupId>joda-time</groupId>
        <artifactId>joda-time</artifactId>
        <version>2.1</version>
    </dependency>


    <dependency>
        <groupId>org.jgroups</groupId>
        <artifactId>jgroups</artifactId>
        <version>3.2.0.Final</version>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-math</artifactId>
        <version>2.0</version>
    </dependency>

    <!-- test -->

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>${spring.version}</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.8.2</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.apache.openjpa</groupId>
        <artifactId>openjpa</artifactId>
        <version>2.2.0</version>
    </dependency>

    <dependency>
        <groupId>org.hectorclient</groupId>
        <artifactId>hector-core</artifactId>
        <version>1.1-4</version>
        <exclusions>
            <exclusion>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>com.datastax.cassandra</groupId>
        <artifactId>cassandra-driver-core</artifactId>
        <version>1.0.4</version>
    </dependency>

    <dependency>
        <groupId>org.hectorclient</groupId>
        <artifactId>hector-object-mapper</artifactId>
        <version>3.1-09</version>
        <exclusions>
            <exclusion>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-client</artifactId>
        <version>1.8</version>
    </dependency>

    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.2</version>
    </dependency>

    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>fluent-hc</artifactId>
        <version>4.2</version>
    </dependency>

    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpcore</artifactId>
        <version>4.2</version>
    </dependency>

    <dependency>
        <groupId>org.jboss.netty</groupId>
        <artifactId>netty</artifactId>
        <version>3.2.9.Final</version>
    </dependency>
    <dependency>
        <groupId>org.apache.curator</groupId>
        <artifactId>curator-recipes</artifactId>
        <version>2.2.0-incubating</version>
    </dependency>
</dependencies>

<build>
    <finalName>T2ClaimsPortal</finalName>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
            </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-surefire-plugin</artifactId>
            <configuration>
                <includes>
                    <include>**/*Tests.java</include>
                </includes>
            </configuration>
        </plugin>
    </plugins>
</build>

有人能给我一些理解为什么我会得到这个例外吗？我有一个在本地运行的 cassandra 客户端。（版本 1.2.11）。

【问题讨论】：

标签： java cassandra pom.xml datastax-java-driver

【解决方案1】：

这不是你的 pom 文件的问题。您的客户端（DataStax Java 驱动程序）无法访问您的 cassandra 数据库。这可能是由于以下几个原因：

检查您正在使用的节点的地址。
还要检查端口，Cassandra 原生二进制协议的默认端口是 9042。

【讨论】：

【解决方案2】：

我在虚拟机上安装了 Cassandra Server，但无法远程访问它。我得到了异常：

com.datastax.driver.core.exceptions.NoHostAvailableException: 
All host(s) tried for query failed (tried: /192.168.1.76:9042 (com.datastax.driver.core.TransportException: [/192.168.1.76:9042] Cannot connect))

首先，我确认我无法通过 telnet 访问端口 9042。

我解决了在 Cassandra 服务器上修改 cassandra.yaml 配置文件的问题，使用

rpc_address = 0.0.0.0
broadcast_rpc_address = 1.2.3.4

那是因为

rpc_address（或rpc_interface）用于客户端连接， listen_address 属性用于节点间通信。

【讨论】：

【解决方案3】：

您的 cassandara 服务器似乎没有在听您的请求。试试 telnet 127.0.0.1 9160

如果你得到这个 telnet：无法连接到远程主机：连接被拒绝 jdbc库使用DataStax驱动，更成熟，无bug

<dependency>
<groupId>org.apache-extras.cassandra-jdbc</groupId>
<artifactId>cassandra-jdbc</artifactId>
<version>1.2.5</version>
</dependency>

然后重启你的 cassandara

【讨论】：

【解决方案4】：

遇到了太相似的问题：我的 spring 应用程序因 NoHostAvailable 而失败，我能够通过在配置文件 cassandra.yaml 中设置 rpc_port 和 native_transport_port 来匹配用于连接到 cassandra 的 eaxct IP 地址（即 Cluster. builder().addContactPoints(... 这里的 IP 地址 ...) )，但后来 cqlsh 不再启动，因为主机没有在听...直到我意识到侦听器（rpc 或本地传输）要么在听在 127.0.0.1 上，否则主机的真正 IP 为 10.0.0.5，这在此实现中产生了天壤之别！因此，我通过将 cqlsh 脚本对齐以也使用 10.0.0.5 并获取解析为 127.0.0.1 而不是 10.0.0.5 的 localhost 名称来解决它......这不符合原始 IP 网络原则以拥有最终应用程序做出这样的改变。

【讨论】：