revert(engine-spring): provide support for JDK 9 and onwards
revert(engine-spring): provide support for JDK 9 and onwards

This reverts commit 0f00c5a

related to CAM-9288

langfr/camunda-bpm-platform,camunda/camunda-bpm-platform,ingorichtsmeier/camunda-bpm-platform,falko/camunda-bpm-platform,falko/camunda-bpm-platform,ingorichtsmeier/camunda-bpm-platform,langfr/camunda-bpm-platform,xasx/camunda-bpm-platform,ingorichtsmeier/camunda-bpm-platform,xasx/camunda-bpm-platform,ingorichtsmeier/camunda-bpm-platform,langfr/camunda-bpm-platform,ingorichtsmeier/camunda-bpm-platform,xasx/camunda-bpm-platform,falko/camunda-bpm-platform,langfr/camunda-bpm-platform,xasx/camunda-bpm-platform,falko/camunda-bpm-platform,langfr/camunda-bpm-platform,falko/camunda-bpm-platform,camunda/camunda-bpm-platform,camunda/camunda-bpm-platform,ingorichtsmeier/camunda-bpm-platform,falko/camunda-bpm-platform,camunda/camunda-bpm-platform,xasx/camunda-bpm-platform,camunda/camunda-bpm-platform,xasx/camunda-bpm-platform,langfr/camunda-bpm-platform,camunda/camunda-bpm-platform