创建R包时包含jar文件 [英] Include jar file when creating an R package

问题描述

我创建了一个骨架R包：

I created a skeleton R package:

lib
 jarFileHere.jar 
R
 r_code_file.R

r_code_file.R 尝试引用类文件在 jarFileHere.jar ：

library("rJava")
library("rjson")

.onLoad <- function(libname, pkgname) {
  .jpackage(pkgname, lib.loc=libname)
}

.onLoad("packagename", "../lib/jarFileHere.jar")

.jnew("com/test/ClassHere", "") 

但由于java.lang.NoClassDefFoundError而导致失败。

But I get a failure due to java.lang.NoClassDefFoundError.

我能够使用

.jinit
.jaddClassPath("../lib/jarFileHere.jar")

但是rJava文档明确表示不使用.jinit，因为当代码是用作包。

but the rJava docs explicitly says not to use .jinit because it won't work when the code is used as a package.

推荐答案

使你的结构如下：

inst
 java
  jarFileHere.jar 
R
 r_code_file.R

For有关如何在包中包含java的示例，请参阅 helloJavaWorld 包。

For examples on how to include java in your package look at the helloJavaWorld package.

另请查看 Deducer 和 DeducerplugInExample 。在Deducer的网络手册中有一个关于在你的包中包含java代码的教程：
http://www.deducer.org/pmwiki/pmwiki.php?n=Main.Development#suaptijc

Also take a look at the source of Deducer and DeducerplugInExample. There is a tutorial on including java code in your package available on Deducer's web manual: http://www.deducer.org/pmwiki/pmwiki.php?n=Main.Development#suaptijc

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