载入mailR 包的时候会提示如下：
library(mailR)
JavaVM: requested Java version ((null)) not available. Using Java at "" instead.
JavaVM: Failed to load JVM: /bundle/Libraries/libserver.dylib
JavaVM FATAL: Failed to load the jvm library.
Error : .onLoad failed in loadNamespace() for 'mailR', details:
call: .jinit()
error: JNI_GetCreatedJavaVMs returned -1
Error: package or namespace load failed for ‘mailR
rjava包也安好了，电脑是mac，也安装了java，不知道为什么会这样，希望各位大神能解答疑惑！
