当使用 JDBC 函数将 R 连接到 amazon redshift 时(我使用的是 Windows 10),出现以下错误:
Error in .jfindClass(as.character(driverClass)[1]) : class not found
我正在运行的代码是
install.packages("rJava")
install.packages("RJDBC")
library(rJava)
library(RJDBC)
download.file('http://s3.amazonaws.com/redshift-downloads/drivers/RedshiftJDBC41-1.1.13.1013.jar','RedshiftJDBC41-1.1.13.1013.jar')
driver <- JDBC("com.amazon.redshift.jdbc41.Driver", "RedshiftJDBC41-1.1.13.1013.jar", identifier.quote = "`")
要获取有关我运行的错误的更多信息:
.jclassLoader()$setDebug(1L)
完整的错误跟踪是:
RJavaClassLoader: added 'RedshiftJDBC41-1.1.13.1013.jar' to the URL class path loader
RJavaClassLoader: adding Java archive file 'RedshiftJDBC41-1.1.13.1013.jar' to the internal class path
RJavaClassLoader: added 'C:/Users/user/Documents/R/win-library/3.2/RJDBC/java/RJDBC.jar' to the URL class path loader
RJavaClassLoader: adding Java archive file 'C:/Users/user/Documents/R/win-library/3.2/RJDBC/java/RJDBC.jar' to the internal class path
RJavaClassLoader@33909752.findClass(com.amazon.redshift.jdbc41.Driver)
- URL loader did not find it: java.lang.ClassNotFoundException: com.amazon.redshift.jdbc41.Driver
RJavaClassLoader.findClass("com.amazon.redshift.jdbc41.Driver")
- trying class path "C:\Users\user\Documents\R\win-library\3.2\rJava\java"
Directory, can get 'C:\Users\user\Documents\R\win-library\3.2\rJava\java\com\amazon\redshift\jdbc41\Driver.class'? NO
- trying class path "C:\Users\user\Documents\R\win-library\3.2\RJDBC\java\RJDBC.jar"
JAR file, can get 'com/amazon/redshift/jdbc41/Driver'? NO
- trying class path "C:\Users\user\Desktop\Pricing"
Directory, can get 'C:\Users\user\Desktop\Pricing\com\amazon\redshift\jdbc41\Driver.class'? NO
- trying class path "C:\Users\user\Desktop\Pricing\RedshiftJDBC41-1.1.9.1009.jar"
JAR file, can get 'com/amazon/redshift/jdbc41/Driver'? NO
- trying class path "RedshiftJDBC41-1.1.9.1009.jar"
JAR file, can get 'com/amazon/redshift/jdbc41/Driver'? NO
- trying class path "." Directory, can get '.\com\amazon\redshift\jdbc41\Driver.class'? NO
- trying class path "C:\RedshiftJDBC41-1.1.9.1009.jar"
JAR file, can get 'com/amazon/redshift/jdbc41/Driver'? NO
- trying class path "RedshiftJDBC41-1.1.13.1013.jar"
JAR file, can get 'com/amazon/redshift/jdbc41/Driver'? NO
>> ClassNotFoundException
如果您有任何可以提供帮助的想法,那就太棒了!谢谢
最佳答案
完全相同的问题影响了我。由于某种原因,download.file()
获取了损坏的 .jar。我们小组的开发人员发现了以下修复:
省略:
download.file('http://s3.amazonaws.com/redshift-downloads/drivers/RedshiftJDBC41-1.1.13.1013.jar','RedshiftJDBC41-1.1.13.1013.jar')
直接从 http://docs.aws.amazon.com/redshift/latest/mgmt/configure-jdbc-connection.html 下载 .jar
将 .jar 复制到您的工作目录。
运行其余代码。
关于r - 从 R 连接到 amazon redshift 时出错 - windows 10,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36430627/