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https://issues.apache.org/jira/browse/GROOVY-11126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17744302#comment-17744302
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Jochen Theodorou commented on GROOVY-11126:
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ok, looks like safe navigation is now handled in the invokedynamic part. Since
this works in the beginning I assume that something changes over time. Best
candidate for this is imho the cache we use. To verify this would it be
possible for you to set the system property groovy.indy.callsite.cache.size to
0? My expectation is that then the error will either not happen or a lot
earlier.
> Null-safe Dereference fails after time
> --------------------------------------
>
> Key: GROOVY-11126
> URL: https://issues.apache.org/jira/browse/GROOVY-11126
> Project: Groovy
> Issue Type: Bug
> Components: bytecode
> Affects Versions: 4.0.11, 4.0.12
> Environment: Zulu Java 17.0.7, Amazon Linux 2023, Spring Boot 3.1.1
> Reporter: Kenneth W DeLong
> Priority: Critical
> Attachments: javapOutput.txt, javapOutput2.txt
>
>
> I have a server-side app that works perfectly for a long time (18-24h) then
> suddenly starts throwing "impossible" errors.
> {code:java}
> Caused by: java.lang.NullPointerException: Cannot invoke
> "java.lang.CharSequence.length()" because "self" is null
> at
> org.codehaus.groovy.runtime.StringGroovyMethods.size(StringGroovyMethods.java:2693)
> at org.codehaus.groovy.runtime.dgm$1323.doMethodInvoke(Unknown Source)
> at
> com.hatchbaby.model.ColorParser.isOneByteFormat(ColorParser.groovy:74)
> at com.hatchbaby.model.ColorParser.getRed(ColorParser.groovy:13)
> at com.hatchbaby.domain.Content.getRed(Content.groovy:173)
> {code}
> The line of code at ColorParser:74 is:
> {code:java}
> int size = color?.size() ?: 0 {code}
> The variable `color` is a String. The null-safe dereference operator has
> ceased to short-circuit.
> This code is years old and has run flawlessly. Since the upgrade from Spring
> Boot 2.7.4 to Boot 3.1.1, it runs fine for 18-24h, then it starts throwing
> NullPointerExceptions. This is happening at a couple of other places in the
> code, all on null-safe dereferences that don't short-circuit. The above code
> is hit 9,000+ times/day. We have a cluster of servers and they seem to
> develop the problem within a couple hours of each other.
> The server is running with Spring Boot 3.1.1 (hence Groovy 4.0.12) running on
> Java 17.0.7 (Azul Zulu) on Amazon Linux 2023. The project is joint Java and
> Groovy code that is compiled with the GMavenPlus 3.0.0 Maven plugin (maven
> 3.9.1)
> I have tried to reproduce the error by running a tiny program that mimics the
> error, but so far after running 1.4 million invocations over 24h with no
> errors (as you might expect).
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