Environment (Required on creation):

Camunda 7.14.0 (Any Camunda 7 version - the problem is clearly visible in the source.)

Description (Required on creation; please attach any relevant screenshots, stacktraces, log files, etc. to the ticket):

The DiagramLayout object handling is not finished:

org.camunda.bpm.engine.repository.DiagramEdge and org.camunda.bpm.engine.repository.DiagramEdgeWaypoint classes are exists but never instantiated.

org.camunda.bpm.engine.repository.DiagramNode is fine.

Steps to reproduce (Required on creation):

(Create an engine, deploy a process, acquire the id)

DiagramLayout layout = engine.getRepositoryService().getProcessDiagramLayout(processDefinitionId);

    for (DiagramElement element : layout.getElements().values()) {
      if (element.isNode())

{         System.out.println("    - node: " + element );       }

      if (element.isEdge())

{         System.out.println("    - edge: " + element );       }

    }

Observed Behavior (Required on creation):

DiagramEdges never returned by getElements().

Expected behavior (Required on creation):

DiagramEdges are returned from getElements() along with Nodes.

Also expected:

DiagramEdgeWaypoints accessible from DiagramEdges.

Outward DiagramEdges accessible from DiagramNodes, and/or related DiagramNodes accessible from DiagramEdges.

Root Cause (Required on prioritization):

The implementation of the diagram parsing algorithm not finished correctly:

The org.camunda.bpm.engine.impl.bpmn.diagram.ProcessDiagramLayoutFactory.getBpmnProcessDiagramLayout(Document, InputStream) method focusing on element bounds only, not the actual bean representation.

Solution Ideas (Optional):

Please finish the algorithm with the instantiation of the Edge diagram elements:

org.camunda.bpm.engine.impl.bpmn.diagram.ProcessDiagramLayoutFactory.getBpmnProcessDiagramLayout(Document, InputStream)

It will be needed to complete the DagramEdge with the DagramEdgeWaypoints accessor  and the DagramNode class with the outward DagramEdge list accessor, and/or the DagramEdge class with the related DagramNodes accessor.

DiagramNodes.getEdges() is preferred with outward Edges, because DiagramLayout.getNodes() are already exists, and this way the graph would be walkable.

Hints (optional):

The bound computing algorithm can be simply expanded with the Egde instantiation.