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rjava-native-interfacerjava

rJava passing int to constructor

I defined a java class with several constructors with different parameters. If I try to create a java object in R via obj<-.jnew('testRJava/TestRJava', "Hello", "World") or obj<-.jnew('testRJava/TestRJava', "Hello world") everthing working as expected. But if I try to pass an Integer like obj<-.jnew('testRJava.TestRJava', "Hello", 123) the following error is thrown:

Error in .jnew("testRJava/TestRJava", "Hello", 123) :
java.lang.NoSuchMethodError: <init>

On Java side I definitly defined the constructor public TestRJava(String param1, int param2) {... and the rjava doc says:

Any parameters that will be passed to the corresponding constructor. The parameter types are determined automatically and/or taken from the jobjRef object. For details see .jcall. Note that all named parameters are discarded.

But I can't find how to pass an integer. Do I have to use .jcast or anything else?

Solution

  • 123 is a double. 123L is a (long) integer.