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Unable to force use of jdot #181

offbynull opened this Issue Mar 21, 2019 · 1 comment


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offbynull commented Mar 21, 2019

I see references online saying that you can force PlantUML to use its pure Java Graphviz implementation by putting in !pragma graphviz_dot jdot at the start of your markup, but it doesn't look like this is being parsed correctly anymore?

When I use the following code to render a graph, I get back an image complaining about a syntax error (using version 1.2019.3).

package com.mycompany.test;

import java.awt.Desktop;
import java.nio.file.Files;
import java.nio.file.Path;
import net.sourceforge.plantuml.SourceStringReader;

public class PlantUmlDotTest {

    public static void main(String[] args) throws IOException {
        String source = ""
                + "@startuml\n"
                + "!pragma graphviz_dot jdot\n"
                + "digraph foo {\n"
                + " PlantUML -> Dot [label=use];\n"
                + "}\n"
                + "@enduml";
        SourceStringReader reader = new SourceStringReader(source);

        Path pngPath = Files.createTempFile("", ".png");
        try (OutputStream pngOs = Files.newOutputStream(pngPath)) {

If I remove the pragma, I get back an image saying that there's an issue with the dot/graphviz installation (I don't have a native one installed). How do I force plantuml to use jdot to generate my graph?


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arnaudroques commented Mar 22, 2019

This cannot work.

We did not fully port dot/graphviz to java.
We only port the part that we use to generate PlantUML diagrams.
Our port is not able to parse regular .dot files (digraph)

Sorry about that !

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