Looking for Java-native AG-UI library with Interrupt Support

[nr-abhardwaj]

We are currently implementing AG UI in a Java environment and require interrupt support. We see this community library ag-ui-4j, but it appears to be quite far behind the latest protocol updates.

Since we need to stick strictly to Java, can anyone recommend a more up-to-date alternative library or a reliable workaround to get interrupt support working?

[barry166]

The thing to check is the interrupt lifecycle, not just whether the Java package has a method named interrupt.

In current AG-UI, an interrupt is a run outcome: RUN_FINISHED with outcome: { type: "interrupt", interrupts: [...] }. The client then resumes on the same threadId by sending RunAgentInput.resume with the interrupt ids.

So for strict Java, I would start with the Java SDK/docs (com.ag-ui:core, client, http) or ag-ui-4j, but verify it exposes those two protocol pieces: Interrupt / interrupt outcome, and resume input. If it does not, the workaround is small: model those JSON event types directly and stream them over SSE; there is no JVM-specific runtime magic required for interrupts.