[COCOON-2362] Unsynchronized HashMap.put leads to infinite loop

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.12
• Fix Version/s: 2.1.13
• Component/s: * Cocoon Core
• Urgency: Normal
• Other Info: Patch available
• Assignee: Alfred Nathaniel
• Reporter: Alfred Nathaniel
• Created: 21/Feb/19 14:35
• Updated: 21/Feb/19 17:26
• Resolved: 21/Feb/19 17:26

Description

Under load a Cocoon thread occasionally starts spinning at 100% in an infinite loop. The reason is concurrent writing to a HashMap without proper synchronization. The two stack traces are:

{noformat}
java.util.HashMap.put (HashMap.java:420)
org.apache.cocoon.components.language.generator.GeneratorSelector.select (GeneratorSelector.java:125)
{noformat}

{noformat}
java.util.HashMap.getEntry(HashMap.java:465)
java.util.HashMap.get(HashMap.java:417)
org.apache.cocoon.reading.ResourceReader.getLastModified(ResourceReader.java:242)
{noformat}