repositoryService.createDeployment() 
 .name("expense-process.bar") 
 .addClasspathResource("org/activiti/expenseProcess.bpmn20.xml") 
 .addClasspathResource("org/activiti/expenseProcess.png") 
 .deploy(); 

ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery() 
                            .processDefinitionKey("expense") 
                            .singleResult(); 
 
String diagramResourceName = processDefinition.getDiagramResourceName(); 
InputStream imageStream = repositoryService.getResourceAsStream(processDefinition.getDeploymentId(), diagramResourceName); 
 

<property name="createDiagramOnDeploy" value="false" />