java - 由于 "Invalid tag"错误，无法构造 java 对象

Question

我构建了一个 Web 应用程序，通过 Redisson 驱动程序与 Redis 缓存集群进行通信。Redisson 驱动程序从 YAML 文件加载其配置。该配置包含几个使用对象创建构造函数创建的属性。由于某些原因，由于这些构造函数方法调用，配置无法加载，并出现以下错误:

org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/SessionManagement]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:939)
    at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1812)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: Can't construct a java object for org.redisson.connection.balancer.RoundRobinLoadBalancer; exception=Invalid tag: org.redisson.connection.balancer.RoundRobinLoadBalancer
 in 'reader', line 14, column 17:
      loadBalancer: !<org.redisson.connection.balanc ... 
                    ^

    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:350)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:182)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:373)

这是 YAML 文件:

---
clusterServersConfig:
  idleConnectionTimeout: 10000
  pingTimeout: 1000
  connectTimeout: 1000
  timeout: 1000
  retryAttempts: 3
  retryInterval: 1000
  reconnectionTimeout: 3000
  failedAttempts: 3
  password: null
  subscriptionsPerConnection: 5
  clientName: null
  loadBalancer: !<org.redisson.connection.balancer.RoundRobinLoadBalancer> {}
  slaveSubscriptionConnectionMinimumIdleSize: 1
  slaveSubscriptionConnectionPoolSize: 25
  slaveConnectionMinimumIdleSize: 5
  slaveConnectionPoolSize: 100
  masterConnectionMinimumIdleSize: 5
  masterConnectionPoolSize: 100
  readMode: "SLAVE"
  nodeAddresses:
  - "//172.31.150.113:7000"
  - "//172.31.150.113:7001"
  - "//172.31.150.113:7002"
  - "//172.31.150.113:7003"
  - "//172.31.150.113:7004"
  - "//172.31.150.113:7005"
  scanInterval: 1000
threads: 0
codec: !<org.redisson.codec.JsonJacksonCodec> {}
useLinuxNativeEpoll: false
eventLoopGroup: null

我验证了对象创建所需的 redisson 库位于类路径上。
有谁知道为什么 Snakeyaml 无法正确加载此 YAML 文件吗？

Answer 1

当使用该表单加载为没有预定义标签的 javabean 时，我相信语法是两个感叹号并且没有周围的标记。即

codec: !!org.redisson.codec.JsonJacksonCodec{}

如果加载为带有构造函数和预定义标记的类，则使用方括号而不是大括号:

codec: !org.redisson.codec.JsonJacksonCodec[]

如果这没有帮助，请考虑发布您正在使用的 Snakeyaml 版本。