Apache™ FOP: Building from Source Code
Do You Need To Build?
Apache™ FOP snapshots are either pre-compiled binary or source. If you are using a binary snapshot, it is already built and there is no need to build it again. If you got the source code from a repository snapshot or via Subversion you will need to build FOP. See the Download Instructions for information about where to obtain binary or repository snapshots, and whether a binary or source snapshot is best for your needs.
Set Up Your Environment
JDK
Building FOP requires a minimum Java Development Kit (JDK/SDK) of 1.8 (A Java Runtime Environment is not sufficient).
CLASSPATH
There is generally no need to setup a classpath. All libraries needed to compile FOP are included in the source distribution and are referenced by the build script. You will only need to adjust the classpath if you build FOP in some other way. See the build script build.xml for details.
JAVA_HOME
The build script uses Apache Ant, a popular Java-based build tool, which usually requires that the environment variable JAVA_HOME point to your local JDK root directory. This is true even if you use JDK 1.5 or above, which normally does not need this setting.
Apache Ant
Apache Ant (Version 1.7 or later) must be installed in order to build FOP. Following best practices we don't include Ant with FOP anymore. You can find the instructions to install Ant in the Ant manual on the web.
Apache Maven
Apache Maven (Version 3.6 or later) must be installed in order to build FOP. You can find the instructions to install Maven in the Maven manual on the web.
Run the Build Script
Change to the FOP root directory and build FOP by executing the build script (build.xml) using the "ant" command.
The file build.xml in the FOP root directory is the blueprint that Ant uses for the build. It contains information for numerous build targets, many of which are building blocks to more useful target, and others which are primarily used by the FOP developers. You may benefit from looking through this file to learn more about the various build targets. To obtain a complete list of useful build targets:
ant -projecthelp
The most useful targets are:
-
package: Generates the JAR files (default). This is the normal build that produces a jar file usable for running FOP.
-
clean: Cleans the build directory. This is useful for making sure that any build errors are cleaned up before starting a new build. It should not ordinarily be needed, but may be helpful if you are having problems with the build process itself.
-
javadocs: Creates the FOP API documentation.
To run the build:
ant [target ...]
For example to do a normal build for the "all" target (which is the default):
ant
OR
ant all
To clean the build directory first:
ant clean all
Troubleshooting
If you have problems building FOP, please try the following:
-
Run the build with the target of "clean", then rerun the build.
-
Delete the build directory completely, then rerun the build.
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Make sure you do not have a non-FOP version of xerces.jar, xalan.jar, batik.jar, or another dependency product somewhere in your CLASSPATH.
-
If the build still fails, see the Getting Help page for further help.