Ignore non-String keys in `PropertiesPropertySource.getPropertyNames()`

[tyt-gtdg]

System.getProperties().put(1,1);

2024-05-01 11:16:16.216 ERROR - [http-nio-55588-exec-2]  o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [org.apache.shiro.authc.AuthenticationException: error token] with root cause

java.lang.ArrayStoreException: java.lang.Integer
	at java.util.AbstractCollection.toArray(AbstractCollection.java:196) ~[na:1.8.0_301]
	at java.util.Collections$SynchronizedCollection.toArray(Collections.java:2029) ~[na:1.8.0_301]
	at org.springframework.util.StringUtils.toStringArray(StringUtils.java:924) ~[spring-core-5.2.10.RELEASE.jar:5.2.10.RELEASE]
	at org.springframework.core.env.MapPropertySource.getPropertyNames(MapPropertySource.java:60) ~[spring-core-5.2.10.RELEASE.jar:5.2.10.RELEASE]
	at org.springframework.core.env.PropertiesPropertySource.getPropertyNames(PropertiesPropertySource.java:51) ~[spring-core-5.2.10.RELEASE.jar:5.2.10.RELEASE]
	at org.springframework.cloud.netflix.archaius.ConfigurableEnvironmentConfiguration.getKeys(ConfigurableEnvironmentConfiguration.java:75) ~[spring-cloud-netflix-archaius-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.apache.commons.configuration.AbstractConfiguration.getKeys(AbstractConfiguration.java:574) ~[commons-configuration-1.8.jar:1.8]
	at com.netflix.config.ConcurrentCompositeConfiguration.getKeys(ConcurrentCompositeConfiguration.java:600) ~[archaius-core-0.7.6.jar:0.7.6]
	at org.apache.commons.configuration.SubsetConfiguration.getKeys(SubsetConfiguration.java:192) ~[commons-configuration-1.8.jar:1.8]
	at com.netflix.client.config.DefaultClientConfigImpl.loadProperties(DefaultClientConfigImpl.java:580) ~[ribbon-core-2.3.0.jar:2.3.0]

[snicoll]

@tyt-gtdg thanks for the report, but a line of code is not an actionable bug report. If you want support, please take the time to provide more details as your assumption is hiding more details that we need to investigate.

A sample application that reproduces the problem is ideal. You can attach a zip to this issue or push the code to a separate GitHub repository.

[sbrannen]

In addition, please note that Spring Framework 5.2.10.RELEASE is no longer supported.

In light of that, please upgrade to a supported version to see if the issue still exists.

[jhoeller]

@tyt-gtdg I suppose you'd expect Spring's PropertiesPropertySource to verify that it only contains Strings, or specifically for getPropertyNames to ignore non-String keys? Since we just wrap a target Map/Properties instance there, we cannot reject it - but we can make getPropertyNames leniently ignore non-String keys, just like java.util.Properties.stringPropertyNames() does.