GraphViz has been installed and configured the environment variable (GRAPHVIZ_DOT: E: \ work \ GraphViz \ GraphViz 2.44.1 \ bin \ dot. Exe),
Also configured the PLANTUML_JAR environment variable (PLANTUML_JAR: E: \ work \ graphviz \ plantuml jar),
Java also configured,

Found in the process of writing, write a line can preview, the diagram below:

Write two lines is an error, can't show, as the chart

So it is with the following