[[PageOutline(2-10,Table of Contents)]]

= Developers Guide =

This page describes how to compile the Java source code in IDE in order to get a runnable `josm-custom.jar` file.

== Getting the Source ==
→ [[Source code#Getthesource]]

== Compiling ==
=== Compiling using Ant ===
The easiest way to compile JOSM

→ [[Source code#CompilingusingAnt]]

=== Compiling using Eclipse ===

Download and install Eclipse: https://www.eclipse.org/

Use Eclipse and the provided `.project` and `.classpath` file. Just import project using the JOSM core folder as root directory.

You will have problems compiling, due to problems compiling Mappaint MapCSS with a fresh install of Eclipse. First you will need the [http://www.engr.mun.ca/~theo/JavaCC-FAQ/javacc-faq-moz.htm JavaCC] [http://eclipse-javacc.sourceforge.net/ plugin for Eclipse]. To install it in Eclipse, go to Help->New Software... then add the site [http://eclipse-javacc.sourceforge.net/] as a source, and install the JavaCC Eclipse Plug-in. Then in the Package Explorer, expand org.openstreetmap.josm.gui.mappaint.mapcss, right-click on MapCSSParser.jj, and "Compile with JavaCC". This should put new java files in a package called org.openstreetmap.josm.gui.mappaint.mapcss.parsergen, but if it doesn't, you will have to create the package manually (right-click and create package), then drag the new files into the package you just created (they should be easy to identify based on the light gray text that denotes it was compiled from MapCSSParser.jj). This should resolve any import issues in MapCSSStyleSource.java, and you should now be able to compile JOSM.

If you try to compile the JOSM sources in Eclipse and get errors like "The method marktr(String) is undefined for the type SomeType" look at [https://lists.openstreetmap.org/pipermail/josm-dev/2008-August/001585.html solution suggested at mailing list].

There are also two Videos available at youtube, which show [https://www.youtube.com/watch?v=-LoWGf-hqiQ how to checkout JOSM into Eclipse] and [https://www.youtube.com/watch?v=Z3OjG3nDvzA how to checkout a JOSM plugin into Eclipse].

=== Compiling using Netbeans ===

1. Download and install Netbeans: https://netbeans.org/
2. File → Open Project
3. Navigate to the JOSM source code (see [[#GettingtheSource]]), subdirectory `netbeans/` [[BR]] [[Image(netbean-open.png​)]]
4. Use `1` to compile, `2` to clean and compile, and `3` to run JOSM: [[BR]] [[Image(netbeans-compile-run.png)]]

=== Compiling using ​IntelliJ IDEA ===
→ [[DevelopersGuide/CompilingUsingIntelliJ]]

== Unit Tests ==

It is most convenient, to run tests from an IDE like Eclipse or Netbeans. There is also an ant task to run all tests (but you cannot rerun individual tests).

All unit tests can be run in headless mode (i.e, without a graphic display), allowing them to be run in continuous integration projects.

=== Running Test from Command line ===

==== Prerequisites ====
Here are some of the tools you will need for installing under most linux operating systems.
Tools: ant, java jdk/jre 8, junit
Example install for Ubuntu Linux:
{{{
#!sh
sudo apt-get install ant openjdk-8-jdk junit    # please install these ahead, you definitely need them
}}}

==== All tests ====
The quickest way to run the tests is done using the 'ant' build system.  
{{{
#!sh
ant clean test   # this will run through all 200+ tests marking them sucessful, failure, in error, or skipped.  
}}}

==== Individual tests ====
You can run individual tests from the command line, as well. Include all libraries in the class path like this:
{{{
#!sh
export TESTCP=".:test/unit:test/functional:dist/josm-custom.jar:test/lib/fest/*:test/lib/junit/*:test/lib/*:test/lib/unitils-core/*"
export TESTCP=$TESTCP:"tools/*:tools/findbugs/*"   # added these missing directories. Without it will fail to run.
}}}
Here are a few build and run instructions for some example tests:
{{{
#!sh
# Projections Reference Test
javac -cp $TESTCP test/unit/org/openstreetmap/josm/data/projection/ProjectionRefTest.java
java -cp $TESTCP org.junit.runner.JUnitCore org.openstreetmap.josm.data.projection.ProjectionRefTest

# Download GPS Task Test
javac -cp $TESTCP test/unit/org/openstreetmap/josm/actions/downloadtasks/DownloadGpsTaskTest.java
java -cp $TESTCP org.junit.runner.JUnitCore org.openstreetmap.josm.actions.downloadtasks.DownloadGpsTaskTest
}}}

On Windows the syntax is almost the same:
{{{
#!sh
set TESTCP=".;test/unit;test/functional;dist/josm-custom.jar;test/lib/fest/*;test/lib/junit/*;test/lib/*;test/lib/unitils-core/*;tools/*;tools/findbugs/*"
javac -cp %TESTCP% test/unit/org/openstreetmap/josm/data/projection/ProjectionRefTest.java
java -cp %TESTCP% org.junit.runner.JUnitCore org.openstreetmap.josm.data.projection.ProjectionRefTest

# and similar for the Download GPS Task Test
javac -cp %TESTCP% test/unit/org/openstreetmap/josm/actions/downloadtasks/DownloadGpsTaskTest.java
java -cp %TESTCP% org.junit.runner.JUnitCore org.openstreetmap.josm.actions.downloadtasks.DownloadGpsTaskTest
}}}