.JavaStart
Start the Java Virtual Machine
Description
Starts the Java virtual machine (JVM)
and determines whether it has been started.
Usage
.JavaStart(javaHome, javaOptions, verbose=FALSE)
.JavaIsRunning()
Arguments
| javaHome |
a string specifying the Java home directory.
If not given, it defaults to the value of
Sys.getenv("JAVA_HOME").
|
| javaOptions |
a vector of strings specifying Java options used when starting the
JVM. If not given, the value of Sys.getenv("JAVA_OPTIONS") is
split apart into one or more options.
|
| verbose |
a logical. If TRUE, debugging information is printed while
starting up the JVM, and the Java stack trace is printed on Java
exceptions. If not given, it defaults to TRUE if the value
of Sys.getenv("JAVA_VERBOSE") is the string "TRUE".
|
Details
.JavaStart can be called to explicitly start the JVM. It is
normally not necessary to call this because it is called explicitly
whenever any function like
.JavaMethod or
.JavaCall tries to access the JVM. If it is called after
the JVM is running, it does nothing.
.JavaIsRunning is used to determine whether the JVM is currently
running.
Value
| .JavaStart | returns NULL (invisibly). |
| .JavaIsRunning | returns TRUE if the JVM is already running. |
See Also
Examples
## check whether the JVM is running
.JavaIsRunning()
## start the JVM, if not already running
.JavaStart()