RWeka包加载失败求助：rJava模块无法找到问题排查（R3.5+JDK1.8）

Hey there, let's work through this issue together—this is a super common problem with rJava and RWeka, and I’ve got a few tried-and-true fixes to get you up and running.

Step 1: Verify R and JDK Bit Version Match #

First off, make sure your R installation and JDK are both 64-bit (your error mentions x64/rJava.dll, so R is running 64-bit here).

• Check R's architecture: Run version in your R console—look for the arch field, it should say x86_64 (64-bit).
• Check your JDK: Navigate to your JDK installation folder. If it’s in C:\Program Files\Java\jdk1.8.0_xxx, that’s 64-bit; if it’s in C:\Program Files (x86)\Java..., that’s 32-bit and you’ll need to uninstall it and install the 64-bit JDK 1.8 instead.

Step 2: Set the JAVA_HOME Environment Variable #

R needs to know where your JDK is installed explicitly. Here’s how to set it:

1. Open your system’s Environment Variables (search "Edit the system environment variables" in Windows search).
2. Under System Variables, click "New" and create a variable named JAVA_HOME with the value set to your JDK’s root folder—for example, C:\Program Files\Java\jdk1.8.0_291 (replace with your actual JDK version path).
3. Add %JAVA_HOME%\bin to your System PATH variable (move it to the top of the list to avoid conflicts with other Java installations).
4. Restart your R session, then verify the variable is set correctly by running:

   Sys.getenv("JAVA_HOME")
   

   It should return the exact path you just set.

Step 3: Reinstall rJava from Source #

Sometimes the pre-compiled rJava package doesn’t play nice with your JDK setup. Let’s reinstall it from source:

1. Close R, then open R as Administrator (right-click R/RStudio and select "Run as administrator").
2. Uninstall the existing rJava package first:

   remove.packages("rJava")
   

3. Install from source:

   install.packages("rJava", type = "source")
   

4. Try loading rJava directly first:

   library(rJava)
   

   If this works, then loading library(RWeka) should work too.

Step 4: Reconfigure R’s Java Settings #

If the above steps don’t work, let’s force R to reconfigure its Java connection:

1. Open Command Prompt as Administrator.
2. Navigate to your R installation’s bin folder—for example:

   cd C:\Users\prajj\Documents\R\R-3.5.0rc\bin\x64
   

3. Run the configuration command:

   R CMD javareconf
   

   This will update R’s Java configuration files to match your JDK setup. Restart R after this and try loading RWeka again.

内容的提问来源于stack exchange，提问作者user1340391