RJDBC，与 Oracle 数据库的 Java 连接崩溃

Question

I have a script that opens with some code to start a connection to an Oracle database, however the code is crashing RStudio as soon as it runs. The exact code was run successfully on another machine previously.

The script opens by loading the required RJDBC package:

library("RJDBC", lib.loc="C:/R/library")

After, this I run the code below:

drv = JDBC("oracle.jdbc.OracleDriver", classPath="C:/R/ojdbc7.jar", identifier.quote = " ")

however this crashes Rstudio - there is no error statement, the program simply crashes stating that "R encountered a fatal error . The session was terminated." When I attempt run this at the command line in regular R (not RStudio) it crashes also.

If this is being caused by some conflict between R and machine, is there a way to determine what is causing it?

Thanks

Answer 1

I had exactly the same problem, having just upgraded my Java distribution from v6 to v8 (both Java Runtime and Java Developer Kit, running on Windows 7). I don't what the reason is, but after reinstalling v6 (and keeping v8), the problem was resolved.

Answer 2

In also encountered this problem but in my case the issue was that I had previously set JAVA_HOME in ~/.Renviron that did not match the version in place when rJava was installed. Simply removing JAVA_HOME was the fix in my case.

Answer 3

I was also experiencing the same sort of crash trying to connect to SQL Server.

Setting the JAVA_HOME variable as described https://www.r-bloggers.com/connecting-r-to-an-oracle-database-with-rjdbc/ the crashes went away:

Sys.setenv(JAVA_HOME='C:/Program Files/Java/jdk1.8.0_172')
library(RJDBC)
drv <- JDBC("com.microsoft.sqlserver.jdbc.SQLServerDriver",
"c:/Microsoft JDBC Driver 6.4 for SQL Server/sqljdbc_6.4/enu/mssql-jdbc-6.4.0.jre8.jar")