[R] Identifying presence of Java

[Rui Barradas]

Hello,

This error can be a 32 bits vs 64 bits thing. R and java must have the 
same architecture. If you have 64b Java installed, don't run 32b R. And 
vice-versa.

Hope this helps,

Rui Barradas

Às 18:53 de 09/11/19, Dennis Fisher escreveu:
> Dirk
> 
> I am now more confused (and I appreciate your help in sorting this out).
> 
> I executed
> 	require(“rJava”)
> and received the following error:
> 
>> Error: package or namespace load failed for ‘rJava’:
>>   .onLoad failed in loadNamespace() for 'rJava', details:
>>    call: dyn.load(file, DLLpath = DLLpath, ...)
>>    error: unable to load shared object '/Library/Frameworks/R.framework/Versions/3.6/Resources/library/rJava/libs/rJava.so':
>>    dlopen(/Library/Frameworks/R.framework/Versions/3.6/Resources/library/rJava/libs/rJava.so, 6): Library not loaded: /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home/lib/server/libjvm.dylib
>>    Referenced from: /Library/Frameworks/R.framework/Versions/3.6/Resources/library/rJava/libs/rJava.so
>>    Reason: image not found
>>
> Java is definitely installed on this machine — from a terminal:
> 	PET513> Java -version
> 	java version "13.0.1" 2019-10-15
> 	Java(TM) SE Runtime Environment (build 13.0.1+9)
> 	Java HotSpot(TM) 64-Bit Server VM (build 13.0.1+9, mixed mode, sharing)
> 
> It appears that the problem relates to version # — I have 13.03.1 installed whereas R is looking for 11.0.1
> 
> Any idea how to fix this?
> 
> Dennis
> 
> Dennis Fisher MD
> P < (The "P Less Than" Company)
> Phone / Fax: 1-866-PLessThan (1-866-753-7784)
> www.PLessThan.com
> 
> 
> 
> 
>> On Nov 9, 2019, at 9:35 AM, Dirk Eddelbuettel <edd using debian.org> wrote:
>>
>>
>> Dennis,
>>
>> R does that for you already as it needs to know it for rJava too.
>>
>> On my (Linux) box:
>>
>>   edd using rob:~$ R CMD config JAVA
>>   /usr/lib/jvm/default-java/bin/java
>>   edd using rob:~$ R CMD config JAVA_HOME
>>   /usr/lib/jvm/default-java
>>   edd using rob:~$
>>
>> You could also do the equivalent of `which` or `type -p` from R:
>>
>>   R> Sys.which("javac")
>>              javac
>>   "/usr/bin/javac"
>>   R> Sys.which("javacdoesnotexist")
>>   javacdoesnotexist
>>                ""
>>   R>
>>
>> Hope this helps, Dirk
>>
>> -- 
>> http://dirk.eddelbuettel.com | @eddelbuettel | edd using debian.org
> 
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