R3.5.0环境下qdap包安装后无法加载，存在兼容性问题

Hey there, as someone who’s helped troubleshoot plenty of R package compatibility hiccups, let’s work through your qdap loading problem step by step. You mentioned you’re running R 3.5.0, Windows 10, Java 8.1 64-bit, and RStudio 1.1.447—this is a common compatibility scenario with older R versions and Java-dependent packages like qdap. Here’s what to try:

1. Double-Check 64-Bit Consistency #

First, make sure all your tools are running 64-bit versions—mismatched bits are the #1 culprit for rJava/qdap failures:

• In RStudio, run this command to confirm R’s architecture:

  Sys.getenv("R_ARCH")
  

  If it returns /x64, you’re good. If it shows /i386, you’ll need to switch to the 64-bit R version in RStudio (go to Tools > Global Options > General and select the 64-bit entry under "R version").

2. Manually Set Java Home Path #

Often R can’t auto-detect your Java installation. Here’s how to fix that:

1. Find your Java 8.1 installation folder (usually something like C:\Program Files\Java\jre1.8.0_XXX—replace XXX with your specific update number).
2. In R, run these commands (use double backslashes or forward slashes for the path):

   Sys.setenv(JAVA_HOME="C:\\Program Files\\Java\\jre1.8.0_XXX")
   library(rJava)
   

   If rJava loads successfully, that’s half the battle—qdap relies heavily on it.

3. Reinstall Packages with Compatibility in Mind #

Older R versions need package builds that match their release. Uninstall your current copies and reinstall binary versions (safer for Windows):

# Remove existing problematic packages
remove.packages(c("qdap", "qdapDictionaries", "qdapRegex", "rJava"))

# Install rJava as a pre-compiled binary
install.packages("rJava", type = "binary")

# Install qdap with all dependencies
install.packages("qdap", dependencies = TRUE)

4. Test Outside RStudio #

If qdap still won’t load in RStudio, try opening the base RGui (not RStudio) and run library(qdap). If it works there, the issue is with RStudio’s environment:

• Restart RStudio completely.
• Verify in Tools > Global Options > General that you’re using the same 64-bit R version you tested in RGui.

A quick note: R 3.5.0 is quite outdated, so if you can afford to upgrade to a slightly newer stable version (like R 3.6.x), you’ll avoid a lot of these compatibility headaches. But if you’re stuck with 3.5.0, the steps above should resolve most qdap loading issues.

内容的提问来源于stack exchange，提问作者AJP