java.lang.NullPointerException: This exception has no message.

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Solutions on the web

via GitHub by danilovesky
, 1 year ago
This exception has no message.
via Stack Overflow by Steve Lukis
, 4 months ago
via Spring JIRA by U. Kkm, 1 year ago
This exception has no message.
via Spring JIRA by U. Kkm, 1 year ago
This exception has no message.
via Spring JIRA by Brad L Vandermoon, 1 year ago
This exception has no message.
java.lang.NullPointerException:
at java.util.Collections$UnmodifiableCollection.(Collections.java:1026)
at java.util.Collections$UnmodifiableSet.(Collections.java:1128)
at java.util.Collections.unmodifiableSet(Collections.java:1118)
at org.workcraft.dom.NodeContextTracker.getPostset(NodeContextTracker.java:144)
at org.workcraft.dom.AbstractModel.getPostset(AbstractModel.java:139)
at org.workcraft.plugins.circuit.routing.RouterClient.registerObstacles(RouterClient.java:83)
at org.workcraft.plugins.circuit.VisualCircuit.draw(VisualCircuit.java:392)

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