can't exclude java sources

[domdorn]

I have the following contents in a java file in my java sources
src/main/com/acme/ScalaOptionValueExtractor.java

package com.acme;

import javax.validation.valueextraction.ExtractedValue;
import javax.validation.valueextraction.ValueExtractor;

public class ScalaOptionValueExtractor implements ValueExtractor<scala.Option<@ExtractedValue()?>> {

  @Override
  public void extractValues(scala.Option<?> originalValue, ValueReceiver receiver) {
    if(originalValue.isDefined()) {
      receiver.value(null, originalValue.get());
    }
  }
}

when executing scapegoat through sbt, I'm getting the following log:

[info] [scapegoat] Removing scapegoat class directory: /Users/domdorn/acme/masterdata-service/target/scapegoat-classes
[info] [scapegoat] setting output dir to [/Users/domdorn/acme/masterdata-service/target/scapegoat-report]
[info] [scapegoat] ignored file patterns: .*java
[info] [scapegoat] source prefix: src/main/scala
[info] [scapegoat] minimal warn level: info
[info] compiling 19 Scala sources and 99 Java sources to /Users/domdorn/acme/masterdata-service/target/scapegoat-classes ...
[error] /Users/domdorn/acme/masterdata-service/src/main/java/com/acme/ScalaOptionValueExtractor.java:6:97: illegal start of type
[error] public class ScalaOptionValueExtractor implements ValueExtractor<scala.Option<@ExtractedValue() ?>> {
[error]                                                                                                 ^
[error] /Users/domdorn/acme/masterdata-service/src/main/java/com/acme/ScalaOptionValueExtractor.java:14:2: `>` expected but eof found.
[error] }
[error]  ^
[error] /Users/domdorn/acme/masterdata-service/src/main/java/com/acme/VavrOptionValueExtractor.java:6:106: illegal start of type
[error] public class VavrOptionValueExtractor implements ValueExtractor<io.vavr.control.Option<@ExtractedValue() ?>> {
[error]                                                                                                          ^
[error] /Users/domdorn/acme/masterdata-service/src/main/java/com/acme/VavrOptionValueExtractor.java:14:2: `>` expected but eof found.
[error] }
[error]  ^
[error] four errors found
[error] (Scapegoat / compileIncremental) Compilation failed

I tried disabling scapegoat for java files by setting:

scapegoatIgnoredFiles := Seq(".*java"),

but that doesn't work.
Any help highly appreciated - this is currently blocking my PR :/