Call Static Java Methods
sparkR.callJStatic.Rd
Call a static method in the JVM running the Spark driver. The return value is automatically converted to R objects for simple objects. Other values are returned as "jobj" which are references to objects on JVM.
Arguments
- x
fully qualified Java class name that contains the static method to invoke.
- methodName
name of static method to invoke.
- ...
parameters to pass to the Java method.
Value
the return value of the Java method. Either returned as a R object if it can be deserialized or returned as a "jobj". See details section for more.
Details
This is a low level function to access the JVM directly and should only be used for advanced use cases. The arguments and return values that are primitive R types (like integer, numeric, character, lists) are automatically translated to/from Java types (like Integer, Double, String, Array). A full list can be found in serialize.R and deserialize.R in the Apache Spark code base.
Examples
if (FALSE) {
sparkR.session() # Need to have a Spark JVM running before calling callJStatic
sparkR.callJStatic("java.lang.System", "currentTimeMillis")
sparkR.callJStatic("java.lang.System", "getProperty", "java.home")
}