[R] How to change the default library directory?

[Bai Yan]

I installed SJava package at $R_HOME/lib/R/library/

When I conduct library(SJava), I always need to explicitly specify the
library path, how could I change the default library path?

I have included the SJava path in the LD_LIBRARY_PATH variable as:
%echo $LD_LIBRARY_PATH
R_HOME/lib/R/library:R_HOME/lib/R/library/SJava/libs:/usr/java/j2sdk1.4.0_01/jr$

The result in R is as:
----------------------------------------------------
> library(SJava)
Error in library(SJava) : There is no package called `SJava'
> library(SJava,
lib.loc="/disk/hopper/projects/class/cse514/R/lib/R/library")
Warning message:
The Java machine is no longer initialized automatically. You must
explicitly load it in: firstlib(which.lib.loc, package)
>
----------------------------------------------------

Another question is about firstlib, what should I do to initialize the
Java machine here?

Your helps are really appreciated!!!

Yan Bai