ConcurrentModificationException in HttpSignProvider

[janotav]

Environment Details

• Helidon Version: 2.5.4
• Helidon SE
• JDK version: 11
• OS: Linux

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Problem Description

Under load, following exception is encountered in HttpSignProvider:

Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap.computeIfAbsent(HashMap.java:1135) ~[?:?]
	at io.helidon.security.providers.httpsign.HttpSignProvider.lambda$signRequest$9(HttpSignProvider.java:270) ~[helidon-security-providers-http-sign-2.5.4.jar:2.5.4]
	at java.util.Optional.map(Optional.java:265) ~[?:?]
	at io.helidon.security.providers.httpsign.HttpSignProvider.signRequest(HttpSignProvider.java:269) ~[helidon-security-providers-http-sign-2.5.4.jar:2.5.4]
	at io.helidon.security.providers.httpsign.HttpSignProvider.lambda$outboundSecurity$4(HttpSignProvider.java:261) ~[helidon-security-providers-http-sign-2.5.4.jar:2.5.4]
	at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700) ~[?:?]
	at io.helidon.common.context.Contexts.runInContext(Contexts.java:117) ~[helidon-common-context-2.5.4.jar:2.5.4]
	at io.helidon.common.context.ContextAwareExecutorImpl.lambda$wrap$7(ContextAwareExecutorImpl.java:154) ~[helidon-common-context-2.5.4.jar:2.5.4]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[?:?]
	... 1 more

In order to minimize latency of our reverse proxy, we cache/reuse HttpSignProvider across requests. Is that valid?

[Verdent]

Fixed