通过流程xml 直接先发布模型，然后再通过发布模型之后的流程定义获取bpmn model来创建Model.

1、通过xml先发布模型

InputStream bpmnStream = multipartFile.getInputStream()
deployment = repositoryService.createDeployment()
                    .addInputStream(multipartFile.getOriginalFilename(), bpmnStream).deploy();
            List<ProcessDefinition> list = repositoryService.createProcessDefinitionQuery()
                    .deploymentId(deployment.getId()).list();
            String processDefinitionId = list.get(0).getId();
            convertToModel(processDefinitionId);

2. 发布之后 通过流程定义获取bpmn model新建model

注意这里的addModelEditorSource addModelEditorSourceExtra获取。

 Model modelData = repositoryService.newModel();
        ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()
                .processDefinitionId(processDefinitionId).singleResult();
        InputStream bpmnStream = repositoryService.getResourceAsStream(processDefinition.getDeploymentId(),
                processDefinition.getResourceName());
        XMLInputFactory xif = XMLInputFactory.newInstance();
        InputStreamReader in = new InputStreamReader(bpmnStream, "UTF-8");
        XMLStreamReader xtr = xif.createXMLStreamReader(in);
        BpmnModel bpmnModel = new BpmnXMLConverter().convertToBpmnModel(xtr);
        BpmnJsonConverter converter = new BpmnJsonConverter();
        com.fasterxml.jackson.databind.node.ObjectNode modelNode = converter.convertToJson(bpmnModel);
        modelData.setKey(processDefinition.getKey());
        modelData.setName(processDefinition.getKey());
        ObjectNode modelObjectNode = objectMapper.createObjectNode();
        modelObjectNode.put(ModelDataJsonConstants.MODEL_NAME, processDefinition.getResourceName());
        modelObjectNode.put(ModelDataJsonConstants.MODEL_REVISION, 1);// 版本
        modelObjectNode.put(ModelDataJsonConstants.MODEL_DESCRIPTION,processDefinition.getResourceName());
        modelData.setMetaInfo(modelObjectNode.toString());
        repositoryService.saveModel(modelData);
        DefaultProcessDiagramGenerator generator = new DefaultProcessDiagramGenerator();
        generator.generateDiagram(bpmnModel,  new ArrayList<>());
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        IoUtil.copy(bpmnStream, bos);
        byte[] bytes = bos.toByteArray();
        repositoryService.addModelEditorSource(modelData.getId(), modelNode.toString().getBytes("utf-8"));
        repositoryService.addModelEditorSourceExtra(
                modelData.getId(), bytes);
        deploy(modelData.getId());