JarCastingNeo4j: Graphs for Everyone
Neo4j is the world’s leading Graph Database. It is a high performance graph store with all the features expected of a mature and robust database, like a friendly query language and ACID transactions. The programmer works with a flexible network structure of nodes and relationships rather than static tables — yet enjoys all the benefits of enterprise-quality database. For many applications, Neo4j offers orders of magnitude performance benefits compared to relational DBs.
Learn more on the Neo4j website.
Using Neo4j
Neo4j is available both as a standalone server, or an embeddable component. You can download or try online.
Extending Neo4j
We encourage experimentation with Neo4j. You can build extensions to Neo4j, develop library or drivers atop the product, or make contributions directly to the product core. You’ll need to sign a Contributor License Agreement in order for us to accept your patches.
Dependencies
Neo4j is built using Apache Maven version 3.5.4 and a recent version of supported VM. Bash and Make are also required. Note that maven needs more memory than the standard configuration, this can be achieved with export MAVEN_OPTS="-Xmx512m".
macOS users need to have Homebrew installed.
With brew on macOS
brew install maven
Please note that we do not support building Debian packages on macOS.
With apt-get on Ubuntu
sudo apt install maven openjdk-11-jdk
On top of that, to build Debian packages and Neo4j Desktop:
apt install debhelper devscripts dos2unix dpkg make xmlstarlet # You will need a license for install4j, which is only needed for Neo4j Desktop curl -O https://download-keycdn.ej-technologies.com/install4j/install4j_linux_6_1_4.deb dpkg -i install4j_linux_6_1_4.deb
Building Neo4j
Before you start running the unit and integration tests in the Neo4j Maven project on a Linux-like system, you should ensure your limit on open files is set to a reasonable value. You can test it with ulimit -n. We recommend you have a limit of at least 40K.
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A plain
mvn clean installwill only build the individual jar files. -
Test execution is, of course, part of the build.
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In case you just want the jars, without running tests, this is for you:
mvn clean install -DskipTests. -
To build product packages, do
export PATH="bin:$PATH" && make clean allin the packaging directory after building artifacts with Maven. -
To build the documentation see the Neo4j documentation.
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If you are running into problems building on Windows you can try building Neo4j in a Ubuntu virtual machine.
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You may need to increase the memory available to Maven:
export MAVEN_OPTS="-Xmx512m".
Running Neo4j
After running a mvn clean install, cd into packaging/standalone/target and extract the version you want, then:
bin/neo4j start
in the extracted folder to start Neo4j on localhost:7474. On Windows you want to run:
bin\neo4j start
instead.
Neo4j Desktop
Neo4j Desktop is a convenient way for developers to work with local Neo4j databases.
To install Neo4j Desktop, go to Neo4j Download Center and follow the instructions.
Licensing
Neo4j Community Edition is an open source product licensed under GPLv3.
Neo4j Enterprise Edition includes additional closed-source components not available in this repository and requires a commercial license from Neo4j or one of its affiliates.
Trademark
Neo4j’s trademark policy is available at our trademark policy page.
