javeme commented on issue #2062:
URL:
https://github.com/apache/incubator-hugegraph/issues/2062#issuecomment-1375960811
找到了问题的原因是未加载顶点属性：
```json
{
"exception": "java.lang.IllegalStateException",
"message": "Non-null property 'isUngrouped(id=27)' is null for
'v[677313912013586432]'",
"cause": "[java.lang.IllegalStateException]",
"trace":[
"java.lang.IllegalStateException: Non-null property 'isUngrouped(id=27)' is
null for 'v[677313912013586432]'",
"\tat
com.google.common.base.Preconditions.checkState(Preconditions.java:531)",
"\tat org.apache.hugegraph.util.E.checkState(E.java:68)",
"\tat
org.apache.hugegraph.backend.tx.GraphIndexTransaction.updateIndex(GraphIndexTransaction.java:213)",
"\tat
org.apache.hugegraph.backend.tx.GraphIndexTransaction.updateVertexIndex(GraphIndexTransaction.java:167)",
"\tat
org.apache.hugegraph.backend.tx.GraphTransaction.prepareDeletions(GraphTransaction.java:403)",
"\tat
org.apache.hugegraph.backend.tx.GraphTransaction.prepareCommit(GraphTransaction.java:306)",
"\tat
org.apache.hugegraph.backend.tx.IndexableTransaction.commit2Backend(IndexableTransaction.java:53)",
"\tat
org.apache.hugegraph.backend.tx.AbstractTransaction.commit(AbstractTransaction.java:238)",
"\tat
org.apache.hugegraph.backend.tx.GraphTransaction.commit(GraphTransaction.java:510)",
"\tat
org.apache.hugegraph.StandardHugeGraph$Txs.commit(StandardHugeGraph.java:1489)",
"\tat
org.apache.hugegraph.StandardHugeGraph$TinkerPopTransaction.doCommit(StandardHugeGraph.java:1351)",
"\tat
org.apache.tinkerpop.gremlin.structure.util.AbstractTransaction.commit(AbstractTransaction.java:104)",
"\tat
org.apache.hugegraph.StandardHugeGraph$TinkerPopTransaction.commit(StandardHugeGraph.java:1317)",
"\tat
org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.lambda$commitAll$1(DefaultGraphManager.java:136)",
"\tat
java.util.concurrent.ConcurrentHashMap$EntrySetView.forEach(ConcurrentHashMap.java:4793)",
"\tat
org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.commitAll(DefaultGraphManager.java:133)",
"\tat
org.apache.tinkerpop.gremlin.server.handler.HttpGremlinEndpointHandler.attemptCommit(HttpGremlinEndpointHandler.java:335)",
"\tat
org.apache.tinkerpop.gremlin.server.handler.HttpGremlinEndpointHandler.lambda$channelRead$1(HttpGremlinEndpointHandler.java:227)",
"\tat
org.apache.tinkerpop.gremlin.util.function.FunctionUtils.lambda$wrapFunction$0(FunctionUtils.java:36)",
"\tat
org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:278)",
"\tat java.util.concurrent.FutureTask.run(FutureTask.java:266)",
"\tat
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)",
"\tat java.util.concurrent.FutureTask.run(FutureTask.java:266)",
"\tat
org.apache.hugegraph.auth.HugeGraphAuthProxy$ContextTask.run(HugeGraphAuthProxy.java:1862)",
"\tat
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)",
"\tat
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)",
"\tat java.lang.Thread.run(Thread.java:750)"
]
```
解决方法：
可以在 `GraphIndexTransaction.updateIndex()`
中的205行增加`element.forceLoad()`强制加载下属性：
https://github.com/apache/incubator-hugegraph/blob/d340420341ede1eeb7d36f6e7f7cfdc386844ed6/hugegraph-core/src/main/java/org/apache/hugegraph/backend/tx/GraphIndexTransaction.java#L213
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