在Amazon Linux上运行jFrog artifactory OSS v5.4.6。 在查看远程maven repos时，在管理GUI中使用Artifact Repository Browser时，会定期接收无限微调器。
系统日志显示stacktrace：
2017-09-21 12:31:17,884 [http-nio-8081-exec-11] [ERROR] (o.a.r.c.e.GlobalExceptionMapper:48) - null
java.lang.NullPointerException: null
at org.artifactory.ui.rest.model.artifacts.browse.treebrowser.nodes.JunctionNode.getRepoPkgType(JunctionNode.java:95) ~[artifactory-rest-ui-5.4.6.jar:na]
at org.artifactory.ui.rest.model.artifacts.browse.treebrowser.nodes.JunctionNode.fetchItemTypeData(JunctionNode.java:87) ~[artifactory-rest-ui-5.4.6.jar:na]
at org.artifactory.ui.rest.service.artifacts.browse.treebrowser.tree.BrowseTreeNodesService.execute(BrowseTreeNodesService.java:41) ~[artifactory-rest-ui-5.4.6.jar:na]
at ...
代码：
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