ha-bridge: Manually added devices throw syntax error

I’m using the latest release (3.5.1).

I’ve just setup a new user, and added a systemctl service for ha-bridge.

I added my first device:

{
"id":"1",
"uniqueid":"00:17:88:5E:D3:01-01",
"name":"Living Room Light",
"deviceType":"exec",
"targetDevice":"Encapsulated",
"offUrl":"echo \"rf p5 off\" | nc localhost 1099",
"dimUrl":"echo \"rf p5 xdim ${intensity.percent}\" | nc localhost 1099",
"onUrl":"echo \"rf p5 on\" | nc localhost 1099"
}

If I tell my Home to turn on that device, nothing happens.

When I click any test buttons - e.g “Test ON” - in the web console, I get an alert:

SyntaxError: Unexpected token < in JSON at position 0

I get a similar error if I do a PUT to the api interface:

Unexpected ‘<’

In all cases, the log only shows:

ERROR		spark.webserver.MatcherFilter

What’s going on?

EDIT:

Server stack trace:

2016-11-23 20:39:20,382 [qtp1382067100-16] ERROR spark.webserver.MatcherFilter - 
com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 18 path $[0].item
	at com.google.gson.Gson.fromJson(Gson.java:894)
	at com.google.gson.Gson.fromJson(Gson.java:844)
	at com.google.gson.Gson.fromJson(Gson.java:793)
	at com.google.gson.Gson.fromJson(Gson.java:765)
	at com.bwssystems.HABridge.hue.HueMulator.lambda$19(HueMulator.java:916)
	at spark.RouteImpl$1.handle(RouteImpl.java:58)
	at spark.webserver.MatcherFilter.doFilter(MatcherFilter.java:162)
	at spark.webserver.JettyHandler.doHandle(JettyHandler.java:61)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:189)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119)
	at org.eclipse.jetty.server.Server.handle(Server.java:517)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:302)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:242)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:245)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:75)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:213)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:147)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)
	at java.lang.Thread.run(Thread.java:745)
Caused by: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 18 path $[0].item
	at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1567)
	at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:495)
	at com.google.gson.stream.JsonReader.hasNext(JsonReader.java:418)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:210)
	at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
	at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:72)
	at com.google.gson.Gson.fromJson(Gson.java:879)
	... 22 common frames omitted