[MIME4J-251] Memory leak in TempFileStorageProvider

• Type: Bug
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Affects Version/s: 0.7.2
• Component/s: project
• Assignee: Unassigned
• Reporter: Willem Salembier
• Created: 05/Aug/16 07:20
• Updated: 02/May/24 09:39

Description

Usage of the File#deleteOnExit hook in the class TempFileStorageProvider causes a memory leak for long-running servers:

public StorageOutputStream createStorageOutputStream() throws IOException {
        File file = File.createTempFile(prefix, suffix, directory);
        file.deleteOnExit();
 
        return new TempFileStorageOutputStream(file);
    }

The JDK keeps a set of File references (even when already deleted) in memory until the JVM exists. This set grows infinitely. Server-side libraries should never call File#deleteOnExit

https://bugs.openjdk.java.net/browse/JDK-4872014
https://bugs.openjdk.java.net/browse/JDK-4513817
class DeleteOnExitHook {
private static LinkedHashSet<String> files = new LinkedHashSet<>();

Issue Links

• links to: RESTEASY-1467