【发布时间】：2021-03-30 05:47:22
【问题描述】：
为了运行 H2O，我刚刚从我的 Mac 中删除了 Java 16（降级到 Java 11）。运行h2o.init()后H2O集群终于可以连接了。
但是，我在尝试使用 h2o.importFile() 导入 CSV 文件后立即遇到错误。我检查了该文件是否在我的 R 默认工作目录中，并且运行同一文件的 read.csv() 可以正常工作。有谁知道解决这个问题？非常感谢您的帮助！
Java 版本：
java 版本“11.0.10”2021-01-19 LTS.
Java(TM) SE 运行时环境 18.9（内部版本 11.0.10+8-LTS-162）。
Java HotSpot(TM) 64 位服务器 VM 18.9（内部版本 11.0.10+8-LTS-162，混合模式）
输入的代码是：
sample <- read.csv("sample_csv.csv") #able to read file
library(h2o)
h2o.init()
data.h2o <- h2o.importFile("sample_csv.csv") #error
错误信息：
Connection successful!
R is connected to the H2O cluster:
H2O cluster uptime: 13 hours 41 minutes
H2O cluster timezone: Asia/Singapore
H2O data parsing timezone: UTC
H2O cluster version: 3.32.0.1
H2O cluster version age: 5 months and 21 days !!!
H2O cluster name: H2O_started_from_R_User_pmr248
H2O cluster total nodes: 1
H2O cluster total memory: 4.00 GB
H2O cluster total cores: 16
H2O cluster allowed cores: 16
H2O cluster healthy: TRUE
H2O Connection ip: localhost
H2O Connection port: 54321
H2O Connection proxy: NA
H2O Internal Security: FALSE
H2O API Extensions: Amazon S3, XGBoost, Algos, AutoML, Core V3, TargetEncoder, Core V4
R Version: R version 4.0.4 (2021-02-15)
Your H2O cluster version is too old (5 months and 21 days)!
Please download and install the latest version from http://h2o.ai/download/.
ERROR: Unexpected HTTP Status code: 404 Not Found (url = http://localhost:54321/3/ImportFiles?path=sample_csv.csv&pattern=)
water.exceptions.H2ONotFoundArgumentException
[1] "water.exceptions.H2ONotFoundArgumentException: File sample_csv.csv does not exist"
[2] " water.persist.PersistNFS.importFiles(PersistNFS.java:127)"
[3] " water.persist.PersistManager.importFiles(PersistManager.java:386)"
[4] " water.api.ImportFilesHandler.importFiles(ImportFilesHandler.java:25)"
[5] " jdk.internal.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)"
[6] " java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)"
[7] " java.base/java.lang.reflect.Method.invoke(Method.java:566)"
[8] " water.api.Handler.handle(Handler.java:60)"
[9] " water.api.RequestServer.serve(RequestServer.java:470)"
[10] " water.api.RequestServer.doGeneric(RequestServer.java:301)"
[11] " water.api.RequestServer.doGet(RequestServer.java:225)"
[12] " javax.servlet.http.HttpServlet.service(HttpServlet.java:687)"
[13] " javax.servlet.http.HttpServlet.service(HttpServlet.java:790)"
[14] " org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865)"
[15] " org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:535)"
[16] " org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)"
[17] " org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)"
[18] " org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)"
[19] " org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)"
[20] " org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)"
[21] " org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)"
[22] " org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)"
[23] " org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)"
[24] " org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)"
[25] " water.webserver.jetty9.Jetty9ServerAdapter$LoginHandler.handle(Jetty9ServerAdapter.java:130)"
[26] " org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)"
[27] " org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)"
[28] " org.eclipse.jetty.server.Server.handle(Server.java:531)"
[29] " org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)"
[30] " org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)"
[31] " org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)"
[32] " org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)"
[33] " org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)"
[34] " org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)"
[35] " org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)"
[36] " org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)"
[37] " org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)"
[38] " org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)"
[39] " org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)"
[40] " org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)"
[41] " java.base/java.lang.Thread.run(Thread.java:834)"
Error in .h2o.doSafeREST(h2oRestApiVersion = h2oRestApiVersion, urlSuffix = page, : ERROR MESSAGE: File sample_csv.csv does not exist
【问题讨论】：