尝试从Spring框架连接到在localhost 9041上运行的cassandra时，我不断收到错误消息。它太令人沮丧了，尝试了所有可能的选项-请提供帮助。我正在运行apache-cassandra-3.11.3版本。如果能解决此问题，我将不胜感激。我想使用CassandraJPARepo模型，但是基本加载都没有完成。请帮忙。
我试图连接到cassandra以执行代码，但在配置中失败了。
简单的代码。应用程序主类->加载CassandraConfiguration。 注意：我还想强调一件事，尽管具有默认的application.properties，环境对象也没有初始化。因此必须对键空间名和其他字符进行硬编码。
应用主类：
package com.example.cassandra;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.context.annotation.Profile;
@SpringBootApplication
public class CassandraApplication {
public static void main(String[] args) {
SpringApplication.run(CassandraApplication.class, args);
}
}
配置类：
package com.example.cassandra;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.data.cassandra.config.AbstractCassandraConfiguration;
import org.springframework.data.cassandra.config.CassandraClusterFactoryBean;
import org.springframework.data.cassandra.config.CassandraSessionFactoryBean;
import org.springframework.data.cassandra.config.SchemaAction;
import org.springframework.data.cassandra.core.CassandraAdminTemplate;
import org.springframework.data.cassandra.core.CassandraOperations;
import org.springframework.data.cassandra.core.CassandraTemplate;
import org.springframework.data.cassandra.core.convert.CassandraConverter;
import org.springframework.data.cassandra.core.convert.MappingCassandraConverter;
import org.springframework.data.cassandra.core.mapping.CassandraMappingContext;
import org.springframework.data.cassandra.core.mapping.SimpleUserTypeResolver;
import org.springframework.data.cassandra.core.mapping.TupleTypeFactory;
import com.datastax.driver.core.Cluster;
@Configuration
@PropertySource(value="classpath:application.properties")
public class CassandraConfiguration extends AbstractCassandraConfiguration {
@Autowired
private Environment env;
@Override
public String getKeyspaceName()
{
return "bbmpanukula"; //env.getProperty("${keyspace}"); //"bbmpnukula";
}
@Bean
public CassandraMappingContext mappingContext() throws ClassNotFoundException {
CassandraMappingContext mappingContext= new CassandraMappingContext();
mappingContext.setUserTypeResolver(new SimpleUserTypeResolver(cluster().getObject(), getKeyspaceName()));
return mappingContext;
}
@Bean
public CassandraAdminTemplate cassandraTemplate() throws Exception {
CassandraAdminTemplate template =
new CassandraAdminTemplate(session().getObject(),converter());
return template;
}
@Bean
public CassandraSessionFactoryBean session()
{
CassandraSessionFactoryBean sess = new CassandraSessionFactoryBean();
sess.setKeyspaceName(getKeyspaceName());
sess.setCluster(cluster().getObject());
try {
sess.setConverter(converter());
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
sess.setSchemaAction(SchemaAction.NONE);
return sess;
}
@Bean
public CassandraConverter converter() throws ClassNotFoundException
{
return new MappingCassandraConverter(mappingContext());
}
@Bean
public CassandraClusterFactoryBean cluster()
{
CassandraClusterFactoryBean cbean =
new CassandraClusterFactoryBean();
cbean.setPort(9042);
cbean.setContactPoints("localhost");
return cbean;
}
}
下面是我的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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>cassandra</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>cassandra</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-cassandra</artifactId>
</dependency>
<dependency>
<groupId>com.datastax.cassandra</groupId>
<artifactId>cassandra-driver-core</artifactId>
<exclusions>
<exclusion>
<groupId>io.dropwizard.metrics</groupId>
<artifactId>metrics-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
异常-编译
2019-02-10 16:37:04.828 INFO 24989 --- [ main] c.e.cassandra.CassandraApplication : Starting CassandraApplication on LM0000841 with PID 24989 (/Users/vishnu.hari/Downloads/cassandra/target/classes started by vishnu.hari in /Users/vishnu.hari/Downloads/cassandra)
2019-02-10 16:37:04.841 INFO 24989 --- [ main] c.e.cassandra.CassandraApplication : No active profile set, falling back to default profiles: default
2019-02-10 16:37:06.241 INFO 24989 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2019-02-10 16:37:06.307 INFO 24989 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 51ms. Found 0 repository interfaces.
2019-02-10 16:37:06.322 INFO 24989 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2019-02-10 16:37:06.327 INFO 24989 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 4ms. Found 0 repository interfaces.
2019-02-10 16:37:07.222 INFO 24989 --- [ main] com.datastax.driver.core : DataStax Java driver 3.6.0 for Apache Cassandra
2019-02-10 16:37:07.237 INFO 24989 --- [ main] c.d.driver.core.GuavaCompatibility : Detected Guava >= 19 in the classpath, using modern compatibility layer
2019-02-10 16:37:07.948 INFO 24989 --- [ main] com.datastax.driver.core.ClockFactory : Using native clock to generate timestamps.
2019-02-10 16:37:08.278 INFO 24989 --- [ main] com.datastax.driver.core.NettyUtil : Did not find Netty's native epoll transport in the classpath, defaulting to NIO.
2019-02-10 16:37:08.412 WARN 24989 --- [ main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cassandraTemplate' defined in class path resource [com/example/cassandra/CassandraConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.cassandra.core.CassandraAdminTemplate]: Factory method 'cassandraTemplate' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'session' defined in class path resource [com/example/cassandra/CassandraConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: com/codahale/metrics/Metric
2019-02-10 16:37:10.803 INFO 24989 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-02-10 16:37:10.826 ERROR 24989 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cassandraTemplate' defined in class path resource [com/example/cassandra/CassandraConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.cassandra.core.CassandraAdminTemplate]: Factory method 'cassandraTemplate' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'session' defined in class path resource [com/example/cassandra/CassandraConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: com/codahale/metrics/Metric
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:627) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:607) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1288) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1127) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:538) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at com.example.cassandra.CassandraApplication.main(CassandraApplication.java:13) [classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.cassandra.core.CassandraAdminTemplate]: Factory method 'cassandraTemplate' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'session' defined in class path resource [com/example/cassandra/CassandraConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: com/codahale/metrics/Metric
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
... 18 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'session' defined in class path resource [com/example/cassandra/CassandraConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: com/codahale/metrics/Metric
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1745) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:339) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at com.example.cassandra.CassandraConfiguration$$EnhancerBySpringCGLIB$$3c1a17b4.session(<generated>) ~[classes/:na]
at com.example.cassandra.CassandraConfiguration.cassandraTemplate(CassandraConfiguration.java:50) ~[classes/:na]
at com.example.cassandra.CassandraConfiguration$$EnhancerBySpringCGLIB$$3c1a17b4.CGLIB$cassandraTemplate$2(<generated>) ~[classes/:na]
at com.example.cassandra.CassandraConfiguration$$EnhancerBySpringCGLIB$$3c1a17b4$$FastClassBySpringCGLIB$$a138c58c.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at com.example.cassandra.CassandraConfiguration$$EnhancerBySpringCGLIB$$3c1a17b4.cassandraTemplate(<generated>) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_191]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_191]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_191]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_191]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
... 19 common frames omitted
Caused by: java.lang.NoClassDefFoundError: com/codahale/metrics/Metric
at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1501) ~[cassandra-driver-core-3.6.0.jar:na]
at com.datastax.driver.core.Cluster.init(Cluster.java:208) ~[cassandra-driver-core-3.6.0.jar:na]
at com.datastax.driver.core.Cluster.connectAsync(Cluster.java:376) ~[cassandra-driver-core-3.6.0.jar:na]
at com.datastax.driver.core.Cluster.connect(Cluster.java:332) ~[cassandra-driver-core-3.6.0.jar:na]
at org.springframework.data.cassandra.config.CassandraCqlSessionFactoryBean.connect(CassandraCqlSessionFactoryBean.java:89) ~[spring-data-cassandra-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.data.cassandra.config.CassandraCqlSessionFactoryBean.afterPropertiesSet(CassandraCqlSessionFactoryBean.java:82) ~[spring-data-cassandra-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.data.cassandra.config.CassandraSessionFactoryBean.afterPropertiesSet(CassandraSessionFactoryBean.java:59) ~[spring-data-cassandra-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1804) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1741) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
... 38 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.codahale.metrics.Metric
at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_191]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_191]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_191]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_191]
... 47 common frames omitted
答案 0 :(得分：0)
如堆栈跟踪中所述
嵌套的异常是java.lang.NoClassDefFoundError：com / codahale / metrics / Metric
cassandraTemplate无法创建，因为com/codahale/metrics/Metric在类路径中不可用。
该类来自您已排除的依赖项metrics-core
<groupId>io.dropwizard.metrics</groupId>
<artifactId>metrics-core</artifactId>
请勿排除该依赖关系，并尝试