Stack trace on one of my endpoints

As soon as cats starts up against one of my endpoints, it blows up:

[********* ][*****] ▶ start    Start fuzzing path /v1/my/endpointl
[********* ][*****] ✖ error    Something went wrong while running CATS!
java.lang.StringIndexOutOfBoundsException: begin 0, end -1, length 14
	at java.base/java.lang.String.checkBoundsBeginEnd(String.java:3319)
	at java.base/java.lang.String.substring(String.java:1874)
	at com.endava.cats.model.factory.FuzzingDataFactory.lambda$addNewCombination$9(FuzzingDataFactory.java:320)
	at java.base/java.util.HashMap.forEach(HashMap.java:1336)
	at com.endava.cats.model.factory.FuzzingDataFactory.addNewCombination(FuzzingDataFactory.java:318)
	at com.endava.cats.model.factory.FuzzingDataFactory.getPayloadCombinationsBasedOnOneOfAndAnyOf(FuzzingDataFactory.java:305)
	at com.endava.cats.model.factory.FuzzingDataFactory.generateSample(FuzzingDataFactory.java:289)
	at com.endava.cats.model.factory.FuzzingDataFactory.getResponsePayloads(FuzzingDataFactory.java:441)
	at com.endava.cats.model.factory.FuzzingDataFactory.getFuzzDataForNonBodyMethods(FuzzingDataFactory.java:110)
	at com.endava.cats.model.factory.FuzzingDataFactory.getFuzzingDataForGet(FuzzingDataFactory.java:87)
	at com.endava.cats.model.factory.FuzzingDataFactory.fromPathItem(FuzzingDataFactory.java:72)
	at com.endava.cats.CatsMain.fuzzPath(CatsMain.java:360)
	at com.endava.cats.CatsMain.startFuzzing(CatsMain.java:174)
	at com.endava.cats.CatsMain.doLogic(CatsMain.java:165)
	at com.endava.cats.CatsMain.run(CatsMain.java:143)
	at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:819)
	at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:803)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:346)
	at com.endava.cats.CatsMain.main(CatsMain.java:102)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
	at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
	at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
	at org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLauncher.java:467)

My API does not throw any errors when this happens. Suggestions for what might cause this?

[rotten]

I’ll see what I can do.

[rotten]

Excellent! Thanks! I can confirm the NPE is gone. Now I’ll go back to building my example to see if I can get that IndexOutOfBounds exeception again so we have an example demonstrating the issue. This may take me a couple of days because I have a very full schedule for the next few days.