jbertram commented on a change in pull request #3078: ARTEMIS-2708 JDK bug
causes missed props reload
URL: https://github.com/apache/activemq-artemis/pull/3078#discussion_r407785265
##########
File path:
artemis-server/src/main/java/org/apache/activemq/artemis/spi/core/security/jaas/ReloadableProperties.java
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@@ -137,7 +137,14 @@ private void load(final File source, Properties props)
throws IOException {
}
private boolean hasModificationAfter(long reloadTime) {
- return key.file.lastModified() > reloadTime;
+ /**
+ * A bug in JDK 8/9 (i.e.
https://bugs.openjdk.java.net/browse/JDK-8177809) causes
java.io.File.lastModified() to
+ * lose resolution past 1 second. Because of this, the value returned by
java.io.File.lastModified() can appear to
+ * be smaller than it actually is which can cause the broker to miss
reloading the properties if the modification
+ * happens close to another "reload" event (e.g. initial loading). In
order to *not* miss file modifications that
+ * need to be reloaded we artificially inflate the value returned by
java.io.File.lastModified() by 1 second.
+ */
Review comment:
No, it won't break. The worst that will happen is that the file might be
reloaded a few more times than necessary which will take more time relatively
speaking but really shouldn't be a big deal.
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