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This maven plugin allows you to inspect compile time relations on classes within the class path of your projects, and its dependencies. And renders a Class Diagram src for PlantUML in cli output as

[INFO] Following is the PlantUML src: 
' Created by

' Using left to right direction to try a better layout feel free to edit
left to right direction
' Participants 

class com.github.juanmf.java2plant.render.filters.PredicateFilter {
#  predicate : Predicate
+  satisfy()  : boolean


' Relations

com.github.juanmf.java2plant.render.filters.Filters "1"  o-left-  "1" com.github.juanmf.java2plant.render.filters.RelationFieldsFilter  : FILTER_RELATION_FORBID_TO_BASE

[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.295 s
[INFO] Finished at: 2016-08-02T08:19:29-03:00
[INFO] Final Memory: 17M/212M
[INFO] ------------------------------------------------------------------------

It also writes output diagram to j2puml.txt at pom's directory.


To use it as a plugin, 1st you need install it in local repo as follows. Step at this project's pom Directory and run

mvn clean install

Then add the plugin gropu to your ~/.m2/settings.xml



Step at your project's pom directory and then play around with CLI options

 mvn   -Dparse.thePackage="" clean compile java2PlantUML:parse
 mvn   -Dparse.thePackage=", com.other.package" clean compile java2PlantUML:parse
 mvn   -Dparse.thePackage=", com.other.Class" clean compile java2PlantUML:parse

Usage of Filters

Filters control the output by providing a configurable way to limit noise. These filters are applied in key rendering points by PlantRenderer#render()

There are of three kinds:

  • Classes: prevent printing details of Class<?> objects that match some criteria.
  • Relation: prevent printing Relations whose from or To side objects matches some criteria.
  • RelationTypes: prevent printing relations by their type, this is a coarse approach.

Chain filters

To customize output further more, youc an use Chain filters of each of the three filter types, achieving a complex behavior by combination of simpler filters. e.g. Filters.FILTER_CHAIN_RELATION_STANDARD


You can define filters of any of the three types, that will apply a custom logic to the given object. e.g. {@link #FILTER_RELATION_FORBID_AGGREGATION_FROM_PRIVATE}

Default Filters

If no Filtering options are given following Filters will be used

  "parse.relationTypeFilter" = "FILTER_CHAIN_RELATION_TYPE_STANDARD"
  "parse.classesFilter" = "FILTER_CHAIN_CLASSES_STANDARD"
  "parse.relationsFilter" = "FILTER_CHAIN_RELATION_STANDARD"

To change them use:

 mvn   -Dparse.thePackage="p1" -Dparse.classesFilter="FILTER_FORBID_ANONYMOUS" clean compile java2PlantUML:parse
 mvn   -Dparse.thePackage="p1" -Dparse.relationTypeFilter="FILTER_FORBID_USES" clean compile java2PlantUML:parse
 mvn   -Dparse.thePackage="p1" -Dparse.relationsFilter="FILTER_RELATION_FORBID_TO_PRIMITIVE" clean compile java2PlantUML:parse

Available filter names and types are defined in com.github.juanmf.java2plant.render.filters.Filters#FILTERS Map.

Read com.github.juanmf.java2plant.render.filters.Filters's javadoc and src to understand the three types of filters you can use.

Custom filters usage

You can use a custom chain filter for each of the three types of filters, combining any of the existing filters without the need to code.

  mvn -Dparse.thePackage="p1" \
      -Dparse.classesFilter="FILTER_CHAIN_CLASSES_CUSTOM" \
      clean compile java2PlantUML:parse

  mvn -Dparse.thePackage="p1" \
      -Dparse.relationTypeFilter="FILTER_CHAIN_RELATION_TYPE_CUSTOM" \
      -Dparse.customRelationTypeFilters="FILTER_FORBID_USES,FILTER_FORBID_AGGREGATION" \
      clean compile java2PlantUML:parse

  mvn -Dparse.thePackage="p1" \
      -Dparse.relationsFilter="FILTER_CHAIN_RELATION_TYPE_CUSTOM" \
      clean compile java2PlantUML:parse

Of course you can use all three custom chain filters in a single run.

parse.thePackage is the root (or roots if a comma separated list of packages is given) from where class scanning will get the main classes of your Diagram, it can be a package or a FQCN.


The end result is a file named "j2puml+now+.puml" that you can process with PlantUML online Render in order to get the UML diagram rendered by PlantUML as per the instructions in the generated script. A run over this project renders:

java2Plant diagram should appear here..

Note: the command used was:

mvn   -Dparse.thePackage="com.github.juanmf.java2plant,\
    com.github.juanmf.java2plant.goal.Parse, \
    com.github.juanmf.java2plant.Parser, \
    com.github.juanmf.java2plant.render.filters.Filters, \
    com.github.juanmf.java2plant.render.PlantRenderer" \
    clean compile java2PlantUML:parse

By including specific Class names, even if they are already included in specified packages, you get a note with "Relevant Class" linked to it in the diagram


  • Render several diagrams, making focus on classes inside given packages.
  • Add some indicator in super classes that the methods are overridden
  • Optionally Add a hiararchy top to bottom.
  • fix Map binding in method params.


Reflectively gathers Types and associations from given packages and render PlantUML scr code




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