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PageGraph GraphML file cannot be imported: Failed to invoke procedure `apoc.import.graphml`: Caused by: java.lang.NullPointerException: Cannot invoke "String.split(String)" because "id" is null #634

Open JannisBush opened 2 months ago

JannisBush commented 2 months ago

Guidelines

Please note that GitHub issues are only meant for bug reports/feature requests. If you have questions on how to use APOC, please ask on the Neo4j Discussion Forum instead of creating an issue here.

Expected Behavior (Mandatory)

The GraphML file is successfully imported. The file successfully opens in other programs supporting GraphML (Gephi, yEd)

Actual Behavior (Mandatory)

An error during the importing process occurs:

Neo.ClientError.Procedure.ProcedureCallFailed
Failed to invoke procedure `apoc.import.graphml`: Caused by: java.lang.NullPointerException: Cannot invoke "String.split(String)" because "id" is null

How to Reproduce the Problem

Simple Dataset (where it's possibile)

Same as pagegraph.xml above:

<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd"><desc><version>0.6.3</version><about>https://github.com/brave/brave-browser/wiki/PageGraph</about><is_root>true</is_root><frame_id>0</frame_id><url>https://example.org/</url><time><start>0</start><end>60573</end></time></desc><key id="d1" for="edge" attr.name="attr name" attr.type="string"/><key id="d2" for="edge" attr.name="before" attr.type="int"/><key id="d3" for="node" attr.name="binding" attr.type="string"/><key id="d4" for="node" attr.name="binding event" attr.type="string"/><key id="d5" for="node" attr.name="binding type" attr.type="string"/><key id="d6" for="edge" attr.name="block type" attr.type="string"/><key id="d7" for="edge" attr.name="args" attr.type="string"/><key id="d8" for="edge" attr.name="edge type" attr.type="string"/><key id="d9" for="edge" attr.name="event listener id" attr.type="int"/><key id="d10" for="edge" attr.name="frame id" attr.type="int"/><key id="d11" for="node" attr.name="frame id" attr.type="int"/><key id="d13" for="node" attr.name="host" attr.type="string"/><key id="d14" for="node" attr.name="incognito" attr.type="string"/><key id="d15" for="node" attr.name="is deleted" attr.type="boolean"/><key id="d16" for="edge" attr.name="is style" attr.type="boolean"/><key id="d17" for="edge" attr.name="key" attr.type="string"/><key id="d18" for="node" attr.name="method" attr.type="string"/><key id="d19" for="node" attr.name="node id" attr.type="int"/><key id="d20" for="node" attr.name="tag name" attr.type="string"/><key id="d21" for="node" attr.name="text" attr.type="string"/><key id="d22" for="node" attr.name="node type" attr.type="string"/><key id="d23" for="edge" attr.name="id" attr.type="string"/><key id="d24" for="node" attr.name="id" attr.type="string"/><key id="d25" for="edge" attr.name="timestamp" 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        background-color: #f0f0f2;
        margin: 0;
        padding: 0;
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        background-color: #fdfdff;
        border-radius: 0.5em;
        box-shadow: 2px 3px 7px 2px rgba(0,0,0,0.02);
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    a:link, a:visited {
        color: #38488f;
        text-decoration: none;
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Specifications (Mandatory)

Currently used versions

Versions

gem-neo4j commented 2 months ago

Hi! Thanks for reporting, from what I can see it is because the relationship is before the node, so the node is not found. The error message was not clear though, so I will make sure that is updated :)

JannisBush commented 2 months ago

Thanks for the explanation. After I rewrote the file such that all the edges occur only after the nodes, the import worked successfully.

Does the GraphML specification state that edges can only reference nodes that already occur earlier in the file? I could not find anything regarding the order of nodes and edges.

gem-neo4j commented 2 months ago

Hi again! I believe it is not a bug for a graphml file to be ordered as such, but more lacking functionality inside APOC. I have added a more useful error message to it, and will create a ticket for APOC to be updated to handle the other cases. However, APOC is under maintenance mode, and allowing any order would require a more in-depth update to the procedure, so I can't promise that that part will be worked on any time soon. Sorry for the inconvenience, and thanks for the report :)