我们最近从Java8升级到了Java11，这可能与我们看到的这个新错误有关，也可能与此无关。我们一直在冬眠 5.10.6.Final b/c升级似乎是一项重大任务，但spring现在正在管理许多其他依赖项，包括： Hibernate-Core 5.4.20.Final , Elasticsearch Client 6.6.2 , Apache HTTP client 4.5.12 ，和 Apache HTTP core 4.4.13 .
开始偶尔看到：

java.lang.UnsupportedOperationException: Not implemented! Expected to produce content only over produceContent(), or writeTo(OutputStream) if blocking calls are acceptable for your use case.
    at org.hibernate.search.elasticsearch.util.impl.GsonHttpEntity.getContent(GsonHttpEntity.java:164)
    at co.elastic.apm.agent.es.restclient.ElasticsearchRestClientInstrumentationHelperImpl.createClientSpan(ElasticsearchRestClientInstrumentationHelperImpl.java:103)
    at co.elastic.apm.agent.es.restclient.ElasticsearchRestClientInstrumentationHelperImpl.createClientSpan(ElasticsearchRestClientInstrumentationHelperImpl.java:48)
    at org.elasticsearch.client.RestClient.performRequestAsync(RestClient.java:250)
    at org.elasticsearch.client.RestClient.performRequestAsync(RestClient.java:445)
    at org.hibernate.search.elasticsearch.client.impl.DefaultElasticsearchClient.send(DefaultElasticsearchClient.java:101)
    at org.hibernate.search.elasticsearch.client.impl.DefaultElasticsearchClient.lambda$submit$0(DefaultElasticsearchClient.java:79)
    at org.hibernate.search.util.impl.Futures.lambda$create$0(Futures.java:40)
    at java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:995)
    at java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2137)
    at org.hibernate.search.util.impl.Futures.create(Futures.java:40)
    at org.hibernate.search.elasticsearch.client.impl.DefaultElasticsearchClient.submit(DefaultElasticsearchClient.java:79)
    at org.hibernate.search.elasticsearch.work.impl.SimpleElasticsearchWork.lambda$execute$1(SimpleElasticsearchWork.java:59)
    at java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:995)
    at java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2137)
    at org.hibernate.search.elasticsearch.work.impl.SimpleElasticsearchWork.execute(SimpleElasticsearchWork.java:59)
    at org.hibernate.search.elasticsearch.processor.impl.ElasticsearchWorkProcessor.start(ElasticsearchWorkProcessor.java:227)
    at org.hibernate.search.elasticsearch.processor.impl.ElasticsearchWorkProcessor.executeAsyncUnsafe(ElasticsearchWorkProcessor.java:143)
    at org.hibernate.search.elasticsearch.processor.impl.ElasticsearchWorkProcessor.executeSyncUnsafe(ElasticsearchWorkProcessor.java:127)
    at org.hibernate.search.elasticsearch.query.impl.IndexSearcher.search(IndexSearcher.java:93)
    at org.hibernate.search.elasticsearch.query.impl.ElasticsearchHSQueryImpl.execute(ElasticsearchHSQueryImpl.java:264)
    at org.hibernate.search.elasticsearch.query.impl.ElasticsearchHSQueryImpl.queryEntityInfos(ElasticsearchHSQueryImpl.java:226)
    at org.hibernate.search.query.hibernate.impl.FullTextQueryImpl.doHibernateSearchList(FullTextQueryImpl.java:240)
    at org.hibernate.search.query.hibernate.impl.FullTextQueryImpl.list(FullTextQueryImpl.java:225)
    at org.hibernate.search.query.hibernate.impl.FullTextQueryImpl.getResultList(FullTextQueryImpl.java:124)
    at com.bottomline.dm.core.service.AbstractDmHibernateSearchService.search(AbstractDmHibernateSearchService.java:64)
    at com.bottomline.dm.core.service.matching.DefaultDedupingService.findProbableDupeIds(DefaultDedupingService.java:52)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy256.findProbableDupeIds(Unknown Source)
    at com.bottomline.dm.batch.job.segmentation.dedupe.DedupeSubStep.findProbableDupes(DedupeSubStep.java:328)
    at com.bottomline.dm.batch.job.segmentation.dedupe.DedupeSubStep.doFindDupeSets(DedupeSubStep.java:180)
    at com.bottomline.dm.batch.job.segmentation.dedupe.DedupeSubStep.execute(DedupeSubStep.java:110)
    at com.bottomline.dm.batch.job.segmentation.dedupe.DedupeSubStep$$FastClassBySpringCGLIB$$ef3c77a2.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:367)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:118)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
    at com.bottomline.dm.batch.job.segmentation.dedupe.DedupeSubStep$$EnhancerBySpringCGLIB$$e46d85b9.execute(<generated>)
    at com.bottomline.common.core.springframework.batch.step.SubStepsTasklet.executeSubStep(SubStepsTasklet.java:119)
    at com.bottomline.common.core.springframework.batch.step.SubStepsTasklet.execute(SubStepsTasklet.java:92)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:136)
    at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:124)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy259.execute(Unknown Source)
    at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:407)
    at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:331)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
    at org.springframework.batch.core.step.tasklet.TaskletStep$2.doInChunkContext(TaskletStep.java:273)
    at org.springframework.batch.core.scope.context.StepContextRepeatCallback.doInIteration(StepContextRepeatCallback.java:82)
    at org.springframework.batch.repeat.support.RepeatTemplate.getNextResult(RepeatTemplate.java:375)
    at org.springframework.batch.repeat.support.RepeatTemplate.executeInternal(RepeatTemplate.java:215)
    at org.springframework.batch.repeat.support.RepeatTemplate.iterate(RepeatTemplate.java:145)
    at org.springframework.batch.core.step.tasklet.TaskletStep.doExecute(TaskletStep.java:258)
    at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:208)
    at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148)
    at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:68)
    at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:68)
    at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:169)
    at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144)
    at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:137)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:774)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
    at org.springframework.batch.core.job.flow.FlowJob$$EnhancerBySpringCGLIB$$3c6ee530.doExecute(<generated>)
    at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:319)
    at com.bottomline.common.core.springframework.batch.security.SecureJob.execute(SecureJob.java:65)
    at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:147)
    at co.elastic.apm.agent.impl.async.SpanInScopeRunnableWrapper.run(SpanInScopeRunnableWrapper.java:64)
    at java.lang.Thread.run(Thread.java:748)

有人能解释为什么会发生这种异常（似乎是随机的）以及如何解决它吗？