graph example, initial commit.

.gitignore

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+build/
+.idea/
+out/
+graph.iml
+.gradle/

build.gradle

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+apply plugin: 'java'
+
+sourceSets {
+    main {
+        java {
+            srcDirs = ['src/java']
+        }
+    }
+
+}
+
+repositories {
+  jcenter()
+}
+
+dependencies {
+    implementation 'org.janusgraph:janusgraph-core:0.2.0'
+    implementation 'org.janusgraph:janusgraph-berkeleyje:0.2.0'
+    implementation 'org.slf4j:slf4j-api:1.7.5'
+    implementation 'org.slf4j:slf4j-log4j12:1.7.5'
+
+    testImplementation 'junit:junit:4.12'
+}

src/java/com/example/example.java

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+package com.example;
+
+import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
+import org.apache.tinkerpop.gremlin.structure.Vertex;
+import org.janusgraph.core.Cardinality;
+import org.janusgraph.core.JanusGraph;
+import org.janusgraph.core.JanusGraphFactory;
+import org.janusgraph.core.PropertyKey;
+import org.janusgraph.core.schema.JanusGraphManagement;
+
+
+class Example {
+    public static void main(String[] args) {
+        JanusGraph graph = getGraph();
+        buildIndexFor(graph);
+
+        graph.addVertex("name", "ernesto", "email", "[email protected]");
+
+        GraphTraversal<Vertex, Vertex> traversal = graph
+                .traversal()
+                .V()
+                .has("email", "[email protected]");
+
+        Vertex v = traversal.next();
+
+        System.out.print("Hola " + v.property("name").value());
+    }
+
+    private static final JanusGraph getGraph() {
+        return JanusGraphFactory.build().set("storage.backend", "inmemory").open();
+    }
+
+    private static final void buildIndexFor(JanusGraph graph) {
+        JanusGraphManagement mgmt = graph.openManagement();
+
+        PropertyKey emailKey = mgmt.makePropertyKey("email")
+                .dataType(String.class)
+                .cardinality(Cardinality.SINGLE)
+                .make();
+
+        mgmt.buildIndex("byEmailUnique", Vertex.class)
+                .addKey(emailKey)
+                .unique()
+                .buildCompositeIndex();
+
+        mgmt.commit();
+    }
+}

src/test/com/example/ExampleTest.java

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+package com.example;
+import org.junit.jupiter.api.Test;
+
+class ExampleTest {
+    @Test
+    public void loadGraphTest() {
+
+    }
+}