使用spring boot3连接cassandra数据库时失败，提示需要显示【Current contact points are: Node(endPoint=/127.0.0.1:9042, hostId=de19c83a-0d23-472a-a5cd-3e24d5aa0516, hashCode=387751e6)=datacenter1. Current DCs in this cluster are: datacenter1】
pom文件配置：
<?xml version="1.0" encoding="UTF-8"?>
<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 https://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>3.1.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>20</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-cassandra</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
yml文件配置：
server:
port: 9090
cassandra:
contactpoints: 172.31.208.1:9042
keyspacename: tacocloud
localdatacenter: datacenter1
spring:
datasource:
url: jdbc:mysql://127.0.0.1:3306/Taco
username: root
password: root
jpa:
database: MYSQL
hibernate:
ddl-auto: update
data:
cassandra:
keyspace-name: tacocloud
local-datacenter: dc1
contact-points:
- 172.31.208.1
port: 9042
mongodb:
host: 172.31.208.1
port: 27017
database: Taco
报错信息：
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0: Error creating bean with name 'cassandraSession' defined in class path resource [org/springframework/boot/autoconfigure/cassandra/CassandraAutoConfiguration.class]: Failed to instantiate [com.datastax.oss.driver.api.core.CqlSession]: Factory method 'cassandraSession' threw exception with message: Since you provided explicit contact points, the local DC must be explicitly set (see basic.load-balancing-policy.local-datacenter in the config, or set it programmatically with SessionBuilder.withLocalDatacenter). Current contact points are: Node(endPoint=/127.0.0.1:9042, hostId=de19c83a-0d23-472a-a5cd-3e24d5aa0516, hashCode=387751e6)=datacenter1. Current DCs in this cluster are: datacenter1
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:245) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1189) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:560) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:520) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:326) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:324) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:973) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:941) ~[spring-context-6.0.10.jar:6.0.10]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:608) ~[spring-context-6.0.10.jar:6.0.10]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.1.1.jar:3.1.1]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:734) ~[spring-boot-3.1.1.jar:3.1.1]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:436) ~[spring-boot-3.1.1.jar:3.1.1]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) ~[spring-boot-3.1.1.jar:3.1.1]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306) ~[spring-boot-3.1.1.jar:3.1.1]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295) ~[spring-boot-3.1.1.jar:3.1.1]
at com.example.demo.DemoApplication.main(DemoApplication.java:10) ~[classes/:na]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:578) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50) ~[spring-boot-devtools-3.1.1.jar:3.1.1]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cassandraSession' defined in class path resource [org/springframework/boot/autoconfigure/cassandra/CassandraAutoConfiguration.class]: Failed to instantiate [com.datastax.oss.driver.api.core.CqlSession]: Factory method 'cassandraSession' threw exception with message: Since you provided explicit contact points, the local DC must be explicitly set (see basic.load-balancing-policy.local-datacenter in the config, or set it programmatically with SessionBuilder.withLocalDatacenter). Current contact points are: Node(endPoint=/127.0.0.1:9042, hostId=de19c83a-0d23-472a-a5cd-3e24d5aa0516, hashCode=387751e6)=datacenter1. Current DCs in this cluster are: datacenter1
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:659) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:647) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1332) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1162) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:560) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:520) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:326) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:324) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1417) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1337) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:888) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-6.0.10.jar:6.0.10]
... 22 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.datastax.oss.driver.api.core.CqlSession]: Factory method 'cassandraSession' threw exception with message: Since you provided explicit contact points, the local DC must be explicitly set (see basic.load-balancing-policy.local-datacenter in the config, or set it programmatically with SessionBuilder.withLocalDatacenter). Current contact points are: Node(endPoint=/127.0.0.1:9042, hostId=de19c83a-0d23-472a-a5cd-3e24d5aa0516, hashCode=387751e6)=datacenter1. Current DCs in this cluster are: datacenter1
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:171) ~[spring-beans-6.0.10.jar:6.0.10]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:655) ~[spring-beans-6.0.10.jar:6.0.10]
... 36 common frames omitted
Caused by: java.lang.IllegalStateException: Since you provided explicit contact points, the local DC must be explicitly set (see basic.load-balancing-policy.local-datacenter in the config, or set it programmatically with SessionBuilder.withLocalDatacenter). Current contact points are: Node(endPoint=/127.0.0.1:9042, hostId=de19c83a-0d23-472a-a5cd-3e24d5aa0516, hashCode=387751e6)=datacenter1. Current DCs in this cluster are: datacenter1
at com.datastax.oss.driver.internal.core.loadbalancing.helper.MandatoryLocalDcHelper.discoverLocalDc(MandatoryLocalDcHelper.java:91) ~[java-driver-core-4.15.0.jar:na]
at com.datastax.oss.driver.internal.core.loadbalancing.DefaultLoadBalancingPolicy.discoverLocalDc(DefaultLoadBalancingPolicy.java:120) ~[java-driver-core-4.15.0.jar:na]
at com.datastax.oss.driver.internal.core.loadbalancing.BasicLoadBalancingPolicy.init(BasicLoadBalancingPolicy.java:158) ~[java-driver-core-4.15.0.jar:na]
at com.datastax.oss.driver.internal.core.metadata.LoadBalancingPolicyWrapper.init(LoadBalancingPolicyWrapper.java:121) ~[java-driver-core-4.15.0.jar:na]
at com.datastax.oss.driver.internal.core.session.DefaultSession$SingleThreaded.initializePools(DefaultSession.java:471) ~[java-driver-core-4.15.0.jar:na]
at com.datastax.oss.driver.internal.core.session.DefaultSession$SingleThreaded.lambda$init$5(DefaultSession.java:389) ~[java-driver-core-4.15.0.jar:na]
at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150) ~[na:na]
at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510) ~[na:na]
at java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2179) ~[na:na]
at com.datastax.oss.driver.internal.core.metadata.MetadataManager$SingleThreaded.lambda$startSchemaRequest$1(MetadataManager.java:447) ~[java-driver-core-4.15.0.jar:na]
at java.base/java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:863) ~[na:na]
at java.base/java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:841) ~[na:na]
at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510) ~[na:na]
at java.base/java.util.concurrent.CompletableFuture.postFire(CompletableFuture.java:614) ~[na:na]
at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:653) ~[na:na]
at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[na:na]
at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~[netty-common-4.1.94.Final.jar:4.1.94.Final]
at io.netty.channel.DefaultEventLoop.run(DefaultEventLoop.java:54) ~[netty-transport-4.1.94.Final.jar:4.1.94.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.94.Final.jar:4.1.94.Final]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.94.Final.jar:4.1.94.Final]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.94.Final.jar:4.1.94.Final]
at java.base/java.lang.Thread.run(Thread.java:1623) ~[na:na]
cassandra配置文件cassandra-rackdc：
dc=dc1
rack=rack1
实在不会了， 希望god们指点
spring.data.cassandra.local-datacenter=datacenter1
spring.cassandra.local-datacenter=datacenter1
基于new bing部分指引作答：
根据错误信息，看起来您在连接Cassandra数据库时遇到了问题。错误消息指出需要显示当前的联系点和数据中心。根据您提供的配置文件，您似乎已经设置了Cassandra的联系点和数据中心，但仍然收到该错误消息。
首先，请确保您的Cassandra数据库正在运行，并且IP地址和端口号与您在application.yml文件中指定的联系点和端口号一致。
另外，请确保您的application.yml文件中的缩进和格式正确。缩进和格式错误可能会导致配置无法正确解析。
您可以尝试以下步骤来解决这个问题：
1、检查Cassandra数据库是否正在运行，并且IP地址和端口号与application.yml文件中的配置一致。
2、检查application.yml文件中的缩进和格式是否正确。确保所有缩进都是使用空格而不是制表符，并且所有的冒号和连字符都是正确的。
3、尝试在application.yml文件中显式设置本地数据中心，添加以下配置：
cassandra:
local-datacenter: datacenter1
或者您可以尝试使用SessionBuilder来设置本地数据中心，例如：
import com.datastax.oss.driver.api.core.CqlSessionBuilder;
import com.datastax.oss.driver.api.core.DefaultConsistencyLevel;
// ...
CqlSessionBuilder sessionBuilder = CqlSession.builder();
sessionBuilder.withLocalDatacenter("datacenter1");
sessionBuilder.withConsistency(DefaultConsistencyLevel.LOCAL_QUORUM);
// ...
请根据您的具体情况选择适合的方法。
如果上述步骤都没有解决您的问题，建议您检查您使用的Spring Boot和Cassandra驱动程序的版本是否兼容。有时版本不兼容可能导致连接问题。
确保在Spring Boot应用程序的配置文件（例如application.properties或application.yml）中正确配置Cassandra连接参数。确保以下属性已正确设置：
spring.data.cassandra.contact-points=127.0.0.1
spring.data.cassandra.local-datacenter=datacenter1
请根据您的实际数据库配置进行修改。
检查Cassandra数据库的网络配置，确保您的应用程序可以访问数据库所在的IP地址和端口号（默认为9042）。如果数据库在本地运行，请确保该地址对应的数据库服务正在运行。
如果您的Cassandra数据库使用了身份验证（例如用户名和密码），请在应用程序的配置文件中提供正确的身份验证参数。例如：
spring.data.cassandra.username=myUsername
spring.data.cassandra.password=myPassword