按照flowable的官方文档https://tkjohn.github.io/flowable-userguide/,创建好流程模型后,想把当前的流程图打印出来。但是报以下错误
19:55:16.855 [main] DEBUG org.flowable.common.engine.impl.interceptor.LogInterceptor - --- GetBpmnModelCmd finished --------------------------------------------------------
Exception in thread "main" java.lang.NullPointerException
at org.flowable.image.impl.DefaultProcessDiagramGenerator.initProcessDiagramCanvas(DefaultProcessDiagramGenerator.java:897)
at org.flowable.image.impl.DefaultProcessDiagramGenerator.generateProcessDiagram(DefaultProcessDiagramGenerator.java:541)
at org.flowable.image.impl.DefaultProcessDiagramGenerator.generateDiagram(DefaultProcessDiagramGenerator.java:456)
at Draw.main(Draw.java:86)