How to kill java objects from R

[sgum]

Could you advice how can I remove the java-objects from R-code or change .jaddClassPath dynamically?

I have create the j object by the next script

model <- "1"

jinit()
.jclassPath()
.jaddClassPath(str_glue("path/{model}/classes/"))
.jclassPath()
quotes.model <- .jnew(str_glue("Model{model}"))
.jconstructors(quotes.model)

after that script I use quotes.model to make some calculations in R

But, later I need to create new object, but I cant't

model <- "2"

jinit()
.jclassPath()
.jaddClassPath(str_glue("path/{model}/classes/"))
.jclassPath()
quotes.model <- .jnew(str_glue("Model{model}"))
.jconstructors(quotes.model)

Maybe I need to remove the quotes.model, but I can't

rm(quotes.model)
Warning message:
In rm(quotes.model) : object 'quotes.model' not found

class(quotes.model)
[1] "jobjRef"
attr(,"package")
[1] "rJava"

ls(quotes.model)
Error in as.environment(pos) : S4 object does not extend class "environment"

How I can remove Java-object?

[s-u]

You cannot remove loaded classes from Java*.

However what you seem to want is to simply to load another version of the class which you can if you simply use another class loader. That's exactly what .jpackage(.., own.loader=TRUE) does so you can have a look here:

rJava/R/loader.R

Lines 42 to 50 in 6d362c1

	if (isTRUE(own.loader)) {
	lib <- "libs"
	if (nchar(.Platform$r_arch))
	lib <- file.path("libs", .Platform$r_arch)
	ns <- asNamespace(name)
	loader <- ns$.rJava.class.loader <-
	.jnew("RJavaClassLoader", .rJava.base.path,
	file.path(.rJava.base.path, lib), .rJava.class.loader, check = FALSE)
	}

Once you have a new loader, just use it as class.loader= in API calls like .jnew(). That way you can load different versions of the classes with the same name many times.

(*) - in theory it's possible if the class loader and all classes that it loaded get garbage-collected in Java. However that is really hard to guarantee since a single reference anywhere in Java is enough to stop that.

[sgum]

Thank you for the option, but it looks like we change inside java