Filename too long sbt

Question

I am getting an error saying I have a file that is too long in sbt.

 [info] Compiling 29 Scala sources to /home/chris/dev/suredbits-core/target/scala-2.11         


        

Answer 1

This is how I solved my problem

mkdir /tmp/myproject-target
cd ~/workspace/myproject
rm -rf target
ln -s /tmp/myproject-target target

Answer 2

Try using a shell script like this:

#!/bin/sh

for file in *; do {
        echo -m "$file" | wc -m;
        echo "$file"
}
done

Running this in your src/main/scala directory should show you which files have a name with more than 254 chars. I hope this answers your question.

Answer 3

I encountered this problem in IntelliJ Ultimate 2016.1.2 (which resembles Intellij 14). I solved it by setting:

-Xmax-classfile-name 78 

In File > Settings... > Build, Execution, Deployment > Compiler > Scala Compiler > Additional Compiler Options.

NOTE: there is a space between the option name and its value ("78"), not an equals sign.

Answer 4

If your /home is an encrypted file system (e.g. LUKS), you might run into this issue.

Setting max-classfile-name to 254 is the default (or it might be 255) - so you're not reducing it much. You should probably be considering something closer to a max length of 70 - 100. You can set it for all your projects by creating ~/.sbt/0.13/local.sbt with the scalac override:

scalacOptions ++= Seq("-Xmax-classfile-name","78")

Answer 5

• Setting the file length limits might be unsafe, I could not find any official documentation that this solution is safe.
• Using un-encrypted directory is not safe.

I want to offer a different approach:

• install veracrypt (in ubuntu with apt)
• create a non-encrypted directory (outside the encrypted user home dir)
• create a veracrypt file container in the new directory
• mount the container in

---

• sbt works fine even if the mount point is in the encrypted directory)

• It is possible to create the container with a complex password and mount on login

  veracrypt -t --pim=0 --protect-hidden=no -k "" -p $PASSWORD $ENCRYPTED_CONTAINER $MOUNT_DIR