Checkout source code

Apache SIS source code is maintained using Git version control, completed by optional data maintained using Subversion version control. Optional data include in particular the EPSG geodetic dataset, which is subject to licensing terms different than Apache ones. This page describes two ways to checkout Apache SIS source code:

  • A basic checkout with only the main repository, the most stable branch, and no configuration requirement.
  • A more advanced configuration for active SIS developments, using uncommitted (for now) API and including optional data for more extensive tests.

It is possible to start with the basic checkout and migrate to the advanced configuration later, or to cherry-pick only the interesting parts of the advanced configuration.

Basic installation

Create an empty directory for the Apache SIS project. We use ApacheSIS directory name in this page, but that name can be anything; replace that name in the shell commands below if another name is used. The Apache SIS source code can be cloned in that directory as below (lines starting with # are comments and can be ignored):

mkdir ApacheSIS
cd ApacheSIS
git clone
# Alternatively, GitHub mirror can also be used:
# git clone
# or Subversion (read-only):
# svn checkout

That is all. Apache SIS can be built by running mvn install in the sis subdirectory. At this stage, the ApacheSIS parent directory is redundant with the sis subdirectory, but we recommend to create that parent directory anyway in anticipation for more subdirectories to be created later, when desired. The remaining of this page describes those optional configurations for more advanced developments.

Advanced installation

This section assumes that above-described basic checkout has been done. All subsections below are optional. It is not mandatory to execute all of them, but we recommend to at least create the data directory described below because some other optional services depend on it.

Create data directory

Apache SIS needs a directory where to store database, datum shift files and other optional data. That directory is specified by the SIS_DATA environment variable and can be located anywhere. A convenient location is a subdirectory of the ApacheSIS directory created in the “basic checkout” section. For example (with ApacheSIS as the current directory):

mkdir Data
export SIS_DATA=$PWD/Data
# For making that environment variable available in future shell sessions,
# the output of following command can be added to .bash_profile or .bashrc
# file in user home directory.
echo export SIS_DATA=$SIS_DATA

Checkout non-free data

The EPSG geodetic dataset is recommended for operations related to Coordinate Reference Systems. Without the EPSG database, only a small subset of coordinate reference systems can be created from EPSG codes. The EPSG database can be installed in various ways, but this section describes an alternative way more suitable to Apache SIS development. Before to continue, make sure to agree with EPSG terms of use. Then following command can be executed with ApacheSIS as the current directory:

# Executing this command imply agreement with EPSG terms of use.
svn checkout

Then copy or link the EPSG scripts in the directory where Apache SIS looks for optional data. Adjust the relative paths as needed if the SIS_DATA environment variable points to another location than the one used in above section:

mkdir $SIS_DATA/Databases
mkdir $SIS_DATA/Databases/ExternalSources
cd $SIS_DATA/Databases/ExternalSources
ln -s ../../../non-free/sis-epsg/src/main/resources/org/apache/sis/referencing/factory/sql/epsg/Data.sql    EPSG_Data.sql
ln -s ../../../non-free/sis-epsg/src/main/resources/org/apache/sis/referencing/factory/sql/epsg/FKeys.sql   EPSG_FKeys.sql
ln -s ../../../non-free/sis-epsg/src/main/resources/org/apache/sis/referencing/factory/sql/epsg/Tables.sql  EPSG_Tables.sql
cd -

This is sufficient for allowing Apache SIS to create the geodetic database without the need for sis-epsg or sis-embedded-data module on the classpath. This setting is not done automatically because Apache projects cannot introduce non-free dependencies without explicit action from user. If this action is not taken, some JUnit tests requiring EPSG data may be skipped. If any EPSG file is updated, deleting the $SIS_DATA/​Databases/​SpatialMetadata directory is sufficient for causing Apache SIS to recreate the Derby database with new data.

Configure PostgreSQL

Apache SIS is tested with Derby, HSQL and PostgreSQL databases. Derby and HSQL are tested automatically using temporary databases in memory. But testing on PostgreSQL requires the creation of a dedicated database on the developer platform. The requirements are:

  • PostgreSQL server running and listening to localhost on default port (5432).
  • A role with the same name than Unix user name of the developer running tests.
  • An empty database named "SpatialMetadataTest".
  • Above-cited role can connect to SpatialMetadataTest database without password.
  • org.apache.sis.test.extensive Java property set to true.

The SpatialMetadataTest database should stay empty when not running tests, because Apache SIS always delete the temporary schema after tests completion, regardless if the tests were successful or not. The role and database can be created by the following SQL instructions (replace my_unix_user_name by your actual user name):

CREATE ROLE my_unix_user_name LOGIN;
CREATE DATABASE "SpatialMetadataTest" WITH OWNER = my_unix_user_name;
COMMENT ON DATABASE "SpatialMetadataTest" IS 'For Apache SIS tests only.';

For opening access to that database without password, it may be necessary to add following line (ignoring comment lines) in the pg_hba.conf file. Location of this file is system-dependent; it may be /var/​lib/​pgsql/​data:

# IPv4 local connections:
# TYPE  DATABASE               USER                 ADDRESS         METHOD
host    SpatialMetadataTest    my_unix_user_name    trust

The last step for allowing Apache SIS to run tests on PostgreSQL is to set the org.apache.sis.test.extensive Java property to true (see next section). This requirement has been added for avoiding undesired interference with host. Note that this step is likely to change after Apache SIS upgrade to JUnit 5.

Running extensive tests

A simple mvn install execution in the sis directory will build and test Apache SIS with the default set of JUnit tests. Some tests are skipped by default, either because they would have some effects outside the sis directory (for example writing in SpatialMetadataTest database on PostgreSQL), or because those tests take a long time to execute. For enabling all tests, use the following command:

cd sis
mvn install -Dorg.apache.sis.test.extensive=true

Switch to development branch

The source code repository contains master, geoapi-3.1 and geoapi-4.0 branches. Apache SIS releases are created from master, which depends on the latest GeoAPI version released by the Open Geospatial Consortium (OGC), currently GeoAPI 3.0.1. However daily developments occur on the geoapi-4.0 branch before to be merged (indirectly) to master. Those branches exist in order to experiment early new API and technologies — since they may impact the library design — while keeping the releases compatible with officially released API. In summary:

Developments on geoapi-4.0 branch are merged to geoapi-3.1 branch, which is then merged to master. When commits reach master they become unmodifiable; the git push --force command is not allowed on that branch. Contributors to Apache SIS project should switch to the current development branch before submitting patches:

cd sis
git checkout geoapi-4.0

Note that those geoapi-xxx branches may disappear or be replaced by something else after OGC releases the corresponding GeoAPI versions.


All developments and tags prior Apache SIS 1.0 were done on a Subversion repository and can be browsed online. Tags for Apache SIS versions 0.1 to 0.8 should be fetched from the SVN repository. The development branches on that repository were named JDK8, JDK7, JDK6 and trunk.