StackOverflowError when OS has a lot of environment variables #700
Description
Hi!
Versions
config v1.4.0
Java 11.0.2
Description
I try to run my application on OS with about 700 environment variables. I have a config file with substitution test = ${ENV_VARIABLE} and next code to create Config:
Config conf = ConfigFactory.systemProperties()
.withFallback(ConfigFactory.parseResources("test.conf"))
.withFallback(ConfigFactory.systemEnvironment())
.resolve();Also I limit thread stack size to 210k using -Xss210k, so the application fails with an error (I skipped the rest of stack trace because it is about 900 lines long)
Exception in thread "main" java.lang.StackOverflowError
at java.base/java.util.Collections$UnmodifiableCollection$1.<init>(Collections.java:1041)
at java.base/java.util.Collections$UnmodifiableCollection.iterator(Collections.java:1041)
at java.base/java.util.Collections$UnmodifiableCollection$1.<init>(Collections.java:1042)
at java.base/java.util.Collections$UnmodifiableCollection.iterator(Collections.java:1041)
at java.base/java.util.Collections$UnmodifiableCollection$1.<init>(Collections.java:1042)
at java.base/java.util.Collections$UnmodifiableCollection.iterator(Collections.java:1041)
at java.base/java.util.Collections$UnmodifiableCollection$1.<init>(Collections.java:1042)
at java.base/java.util.Collections$UnmodifiableCollection.iterator(Collections.java:1041)
I noticed that if I remove the substitution or .withFallback(ConfigFactory.systemEnvironment()) then the application starts.
I debugged and found that in the ResolveContext each call to pushTrace or popTrace wraps cycleMarkers into another UnmodifiableSet (because the constructor does it), even though it's already an UnmodifiableSet.