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If you attach a ChainedInstrumentation with an empty list of sub-instrumentations, you get an ArrayIndexOutOfBoundsException:
java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.elementData(ArrayList.java:418)
at java.util.ArrayList.get(ArrayList.java:431)
at graphql.execution.instrumentation.ChainedInstrumentation.lambda$instrumentExecutionResult$8(ChainedInstrumentation.java:140)
at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602)
at java.util.concurrent.CompletableFuture.uniApplyStage(CompletableFuture.java:614)
at java.util.concurrent.CompletableFuture.thenApply(CompletableFuture.java:1983)
at graphql.execution.instrumentation.ChainedInstrumentation.instrumentExecutionResult(ChainedInstrumentation.java:140)
at graphql.GraphQL.lambda$executeAsync$1(GraphQL.java:474)
at java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:981)
at java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2124)
at graphql.GraphQL.executeAsync(GraphQL.java:474)
at graphql.GraphQL.execute(GraphQL.java:405)
at graphql.GraphQL.execute(GraphQL.java:276)
This is sort of an edge case but was caused when the list of instrumentations can be turned on/off dynamically - not too unlikely, I think.
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