Sequence Diagram
Once installation is complete you should first try creating some Sequence Diagrams. Since these work without Graphviz this is the fastest way to check that the installation worked. If they do not work, other diagrams will probably not work.
You should make sure to test Sequence Diagrams using the command line and not in the target tool you want to install (Eclipse, Word, Mediawiki…) :
java -jar plantuml.jar -verbose sequenceDiagram.txt
In the sequenceDiagram.txt file, you can have a very simple test:
@startuml Alice -> Bob: test @enduml
The -verbose flag is used to generated some logs that you can send to us, if no image is generated.
Under Unix, you must have X11 librairies installed (which is done by default). Otherwise, you will have some HeadlessException.
You may have to add a flag -Djava.awt.headless=true in the link::command-line[command line].
If this is working, but not in your tool, it is probably due to a specific tool issue:
On MediaWiki & Windows, you must set the read & execute permissions on C:\Windows\system32\cmd.exe for the account the PHP web service extension is running under. PHP needs those permissions to "fork" other processes.
Other Diagrams
Once sequence diagrams are working fine, you can focus on other diagrams.
If Graphviz is not installed on your system, you have to link::graphviz-dot[install it first].
Under Linux, try to launch dot command into a command shell. You may have to finalize the installation by typing dot -C.
link::graphviz-dot[You may have to set GRAPHVIZ\_DOT] variables if you have not chosen the default installation directory of Graphviz.
To test the installation of Graphviz, you can use the command line:
java -jar plantuml.jar -testdot
You can also use this special diagram description:
@startuml testdot @enduml
Once again, you should test using the command line and the -verbose flag:
java -jar plantuml.jar -verbose classDiagram.txt
The classDiagram.txt file can be very simple:
@startuml A <|-- B @enduml
If you still have issues, then you can send us a mail.