To load the terrJava package

Prepare your system before you load the terrJava package. After your system is prepared, you can load the package by calling library().

Before loading the terrJava package, you must set the JAVA_HOME environment variable to the base of the Java installation. This can be read within TIBCO Enterprise Runtime for R with: 

   Sys.getenv("JAVA_HOME")

If this is the empty string, set it to the directory where Java is installed with a call such as: 

  Sys.setenv(JAVA_HOME="/usr/lib/jvm/java-7-sun/")

Alternatively, you can set the JAVA_HOME environment variable before starting TIBCO Enterprise Runtime for R.

The terrJava package is included with the TIBCO Enterprise Runtime for R built-in libraries. You can load it with: 

  library(terrJava)

If the library loads without errors, you can test calling into Java by executing the following expressions, both of which should return the number 8: 

  .JavaMethod("java/lang/Math", "pow", "(DD)D", 2, 3)
  .JavaMethod("com/tibco/terr/TerrJava", "testPow", "(DD)D", 2, 3)

Example

The following example demonstrates setting the JAVA_HOME environment variable, starting TIBCO Enterprise Runtime for R, loading the terrJava package, and running the tests on Linux: 

testlabl6406 ~% setenv JAVA_HOME /usr/lib/jvm/java-6-sun/
testlabl6406 ~% TERR
Cannot read termcap database; using dumb terminal settings.
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TIBCO Enterprise Runtime for R version 4.0.0 for Linux 64-bit
Type 'help()' for help.
Type 'q()' to quit.
> library(terrJava)
> .JavaMethod("java/lang/Math", "pow", "(DD)D", 2, 3)
[1] 8
> .JavaMethod("com/tibco/terr/TerrJava", "testPow", "(DD)D", 2, 3)
[1] 8
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