https://build.spring.io/browse/INT-SI51X-18 When we have non-standard symbols in the source code, the `updateCopyrights` Gradle task may break them after because of non-compatible encoding between file reader and source code. * Add `org.gradle.jvmargs='-Dfile.encoding=UTF-8'` to the `gradle.properties` to enforce an expected file reading encoding. * Fix `AbstractFilePayloadTransformerTests` to bring non-standard symbols back