scala.tools.nsc.javac.JavaParsers can't parse JDK15 Text Blocks (JEP 378)

[eed3si9n]

This was originally reported as sbt/sbt#6208 by @larousso

reproduction steps

$ java -version
openjdk version "15.0.1" 2020-10-20
OpenJDK Runtime Environment AdoptOpenJDK (build 15.0.1+9)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 15.0.1+9, mixed mode, sharing)

build.sbt

ThisBuild / scalaVersion     := "2.13.4"
ThisBuild / version          := "0.1.0-SNAPSHOT"

lazy val root = (project in file("."))
  .settings(
    name := "hello",
    // Compile / compileOrder := CompileOrder.JavaThenScala,
  )

src/main/java/example/A.java

package example;

class A {
  private String aText = """
    A text
    """;
}

problem

sbt:hello> compile
[info] compiling 1 Scala source and 1 Java source to /private/tmp/hello/target/scala-2.13/classes ...
[error] /private/tmp/hello/src/main/java/example/A.java:4:29: unclosed string literal
[error]   private String aText = """
[error]                             ^
[error] /private/tmp/hello/src/main/java/example/A.java:6:8: unclosed string literal
[error]     """;
[error]        ^
[error] /private/tmp/hello/src/main/java/example/A.java:7:2: `;` expected but eof found.
[error] }
[error]  ^
[error] three errors found
[error] (Compile / compileIncremental) Compilation failed

expectation

No errors.

notes

https://openjdk.java.net/jeps/378

The workaround is to use Compile / compileOrder := CompileOrder.JavaThenScala.

See also:

• scala.tools.nsc.javac.JavaParsers can't parse JDK14 records #11908
• scala.tools.nsc.javac.JavaParsers can't parse JDK17 "Sealed Classes" #12159

[SethTisue]

@harpocrates if you comment on this ticket, I can assign it to you (merely for credit/glory)

[harpocrates]

Imaginary internet credit and glory points? Sign me up! 😆

[SethTisue]

cha-ching!