APP_CLASSPATH line growths too long in windows startup batch script

[torao]

Expected behaviour

Batch script that made by universal:packageBin for Windows 10 starts my application.

Actual behaviour

"Input line is too long” error is shown.

Information

The problem is that the line set APP_CLASSPATH=... in batch file exceeds the Windows limit of 8,191 chars when dependency libraries in project increases.

It's able to avoid this limitation to divide into multiple lines instead of setting classpath on one line.

set "APP_CLASSPATH=%APP_LIB_DIR%\library1.jar"
set "APP_CLASSPATH=%APP_CLASSPATH%;%APP_LIB_DIR%\library2.jar"
set "APP_CLASSPATH=%APP_CLASSPATH%;%APP_LIB_DIR%\library3.jar"
...

I think it seems to be enough to fix

"set \"APP_CLASSPATH=" + (cp map { path =>
  if (isAbsolute(path)) path else makeRelativePath(path)
} mkString ";") + "\""

in file BatStartScriptPlugin.scala to like follows

val files = cp map { path => if (isAbsolute(path)) path else makeRelativePath(path) }
"set \"APP_CLASSPATH=" + files.head + "\"" + System.lineSeparator() + (files.drop(1) map { path =>
  "set \"APP_CLASSPATH=%APP_CLASSPATH%" + File.pathSeparator + path + "\""
} mkString System.lineSeparator())

.

• Terminal on IntelliJ IDEA 2017.2.6
• sbt 1.0.4
• sbt-native-packager 1.3.1 and 1.1.4
• Java 1.8.0_141
• Scala 2.12.4
• build and target system is Windows 10

[dwickern]

This is a common problem on Windows. Splitting up the set APP_CLASSPATH=... onto multiple lines won't help: running the concatenated command string will fail due to the same 8192 character limit.

I'd recommend generating a classpath jar. Have a look at Dealing with long classpaths

[torao]

argh. that's right. Thank you for your information, I solved my problem to use classpath jar. Thanks!