Question

我使用spring boot application.yml 和自动配置功能配置了spring data cassandra客户端。

它对我有用，但是仅当我不使用spring.data.reconnection-policy属性时。当我使用其中的任何一个（ com.datastax.driver.core.policies.ConstantReconnectionPolicy 或 com.datastax.driver.core.policies.ExponentialReconnectionPolicy ）时，我都会遇到此错误启动：

原因：org.springframework.beans.BeanInstantiationException：无法实例化[com.datastax.driver.core.policies.ConstantReconnectionPolicy]：未找到默认构造函数；嵌套异常为java.lang.NoSuchMethodException：com.datastax.driver.core.policies.ConstantReconnectionPolicy。（）在org.springframework.beans.BeanUtils.instantiateClass（BeanUtils.java:127）〜[spring-beans-5.0.7.RELEASE.jar：5.0.7.RELEASE] 在org.springframework.boot.context.properties.PropertyMapper $ Source.lambda $ as $ 2（PropertyMapper.java:207）〜[spring-boot-2.0.3.RELEASE.jar：2.0.3.RELEASE] 在org.springframework.boot.context.properties.PropertyMapper $ Source.to（PropertyMapper.java:302）〜[spring-boot-2.0.3.RELEASE.jar：2.0.3.RELEASE] 在org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration.cassandraCluster（CassandraAutoConfiguration.java:77）〜[spring-boot-autoconfigure-2.0.3.RELEASE.jar：2.0.3.RELEASE] 在org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration $$ EnhancerBySpringCGLIB $$ 2f475e40.CGLIB $ cassandraCluster $ 0（）〜[spring-boot-autoconfigure-2.0.3.RELEASE.jar：2.0.3.RELEASE]

我扩展了策略类，并在其中添加了默认构造函数。在application.yml中包含新类，一切正常。是否可以在没有解决方法的情况下配置重新连接策略，或者这是一个错误？

谢谢。

这是我的application.yml：

春天：数据：卡桑德拉：＃Cassandra集群的名称。 cluster-name：“测试集群”

  # Cluster node addresses.
  contact-points: 10.247.198.137

  # Login user of the server.
  username: cassandra

  # Login password of the server.
  password: cassandra

  # Compression supported by the Cassandra binary protocol.
  compression: none

 # Port of the Cassandra server.
  port: 9042

  # Socket option: connection time out.
  connect-timeout: 5000ms

  # Queries consistency level.
  consistency-level: three

  # Queries default fetch size.
  fetch-size: 5000

  # Keyspace name to use.
  keyspace-name: testkeyspace

  # Enable SSL support.
  ssl: true

  # Class name of the load balancing policy.
  load-balancing-policy: com.datastax.driver.core.policies.RoundRobinPolicy

  # Reconnection policy class.
  reconnection-policy: com.datastax.driver.core.policies.ConstantReconnectionPolicy


  # Class name of the retry policy.
  retry-policy: com.datastax.driver.core.policies.DefaultRetryPolicy

  # Heartbeat interval after which a message is sent on an idle connection to make sure it's still alive. If a duration suffix is not specified, seconds will be used.
  pool.heartbeat-interval: 30s

  # Idle timeout before an idle connection is removed. If a duration suffix is not specified, seconds will be used.
  pool.idle-timeout: 120s

  # Maximum number of requests that get queued if no connection is available.
  pool.max-queue-size: 256

  # Pool timeout when trying to acquire a connection from a host's pool.
  pool.pool-timeout: 5000ms

  # Socket option: read time out.
  read-timeout: 5000ms

  # Type of Cassandra repositories to enable.
  repositories.type: auto

  # Queries serial consistency level.
  serial-consistency-level: three

  # Schema action to take at startup.
  schema-action: RECREATE_DROP_UNUSED

Spring Data Cassandra无法从application.yml实例化重新连接策略

0 个答案: