pipe.start(graph.getVertices()).inE("a");
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gremlin> g = new TinkerGraph()
==>tinkergraph[vertices:0 edges:0]
gremlin> v1 = g.addVertex(id,1)
==>v[1]
gremlin> v2 = g.addVertex(id,2)
==>v[2]
gremlin> v3 = g.addVertex(id,3)
==>v[3]
gremlin> v4 = g.addVertex(id,4)
==>v[4]
gremlin> v5 = g.addVertex(id,5)
==>v[5]
gremlin> v7 = g.addVertex(id,7)
==>v[7]
gremlin> v1.addEdge("a", v2)
==>e[0][1-a->2]
gremlin> v3.addEdge("a", v2)
==>e[1][3-a->2]
gremlin> v4.addEdge("a", v5)
==>e[2][4-a->5]
gremlin> v7.addEdge("a", v4)
==>e[3][7-a->4]
gremlin> g.V().filter { !it.outE().hasNext() }
No signature of method: com.tinkerpop.gremlin.process.traversers.SimpleTraverser.outE() is applicable for argument types: () values: []
Possible solutions: use([Ljava.lang.Object;), use(java.util.List, groovy.lang.Closure), use(java.lang.Class, groovy.lang.Closure), bulk(), get(), path()
g.V().has(outE().count().is(0L)) // in M6g.V().where(not(outE())) // in the current snapshot
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