scala - 使用elastic4s获取NoClassDefFoundError

Question

我在应用程序中使用play 2.6和scala 2.12，并使用elastic4s进行 flex 搜索。

在我的build.sbt中:

"com.sksamuel.elastic4s" %% "elastic4s-core" % "5.6.0",
"com.sksamuel.elastic4s" %% "elastic4s-http" % "5.6.0",

而且我在日志中不断收到此异常:

Exception in thread "I/O dispatcher 16" java.lang.NoClassDefFoundError: Could not initialize class com.sksamuel.elastic4s.http.JacksonSupport$
    at com.sksamuel.elastic4s.http.ResponseHandler$.fromEntity(ResponseHandler.scala:47)
    at com.sksamuel.elastic4s.http.DefaultResponseHandler.$anonfun$onResponse$1(ResponseHandler.scala:55)
    at scala.util.Try$.apply(Try.scala:209)
    at com.sksamuel.elastic4s.http.DefaultResponseHandler.onResponse(ResponseHandler.scala:55)
    at com.sksamuel.elastic4s.http.HttpExecutable$RichRestClient$$anon$1.onSuccess(HttpExecutable.scala:27)
    at org.elasticsearch.client.RestClient$FailureTrackingResponseListener.onSuccess(RestClient.java:597)
    at org.elasticsearch.client.RestClient$1.completed(RestClient.java:352)
    at org.elasticsearch.client.RestClient$1.completed(RestClient.java:343)
    at org.apache.http.concurrent.BasicFuture.completed(BasicFuture.java:119)
    at org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.responseCompleted(DefaultClientExchangeHandlerImpl.java:177)
    at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.processResponse(HttpAsyncRequestExecutor.java:436)
    at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.inputReady(HttpAsyncRequestExecutor.java:326)
    at org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNHttpClientConnection.java:265)
    at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:81)
    at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:39)
    at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:114)
    at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:162)
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:337)
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:315)
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:276)
    at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:588)
    at java.lang.Thread.run(Thread.java:748)

试图找出可能导致这种情况的原因。

在另一个日志中还看到:

Caused by: com.fasterxml.jackson.databind.JsonMappingException: Scala module 2.8.8 requires Jackson Databind version >= 2.8.0 and < 2.9.0

所以看起来像是 jackson 版本，还是 jackson 版本，但不确定我在哪里更新它或在哪里完全失败...

有人遇到过这个问题吗？
谢谢!

Answer 1

仔细检查您是否要导入 elastic4s-jackson :

libraryDependencies += "com.sksamuel.elastic4s" %% "elastic4s-jackson" % "5.6.0"