This is an unmanaged extension.
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Build it:
mvn clean package -
Copy target/unmanaged-extension-template-1.0.jar to the plugins/ directory of your Neo4j server.
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Configure Neo4j by adding a line to conf/neo4j.conf:
dbms.unmanaged_extension_classes=com.neo4j.example.extension=/example -
Start Neo4j server.
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Query it over HTTP:
curl http://localhost:7474/example/service/helloworld