[JCS-149] When reading keys from disk, a StreamCorruptedException happen when custom serialzer applied.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: jcs-2.0-beta-1, jcs-2.0
• Fix Version/s: jcs-2.0-beta-2
• Component/s: Indexed Disk Cache
• Labels: patch
• Assignee: Thomas Vandahl
• Reporter: Youngho Cho
• Created: 09/May/15 12:22
• Updated: 25/Dec/16 18:35
• Resolved: 20/Nov/15 13:30

Description

When reading keys from disk, following StreamCorruptedException happen when custom serialzer applied.

I attached the patch for this bug.

2015-05-09 21:15:41,368 [main] ERROR org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache - Region [com_nannet_fulcrum_morphology_ko_entry_WordEntry] Problem loading keys for file com_nannet_fulcrum_morphology_ko_entry_WordEntry
java.io.StreamCorruptedException: invalid stream header: 78DA5BF3
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:806)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:299)
at org.apache.commons.jcs.io.ObjectInputStreamClassLoaderAware.<init>(ObjectInputStreamClassLoaderAware.java:33)
at org.apache.commons.jcs.utils.serialization.StandardSerializer.deSerialize(StandardSerializer.java:79)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDisk.readObject(IndexedDisk.java:118)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache.loadKeys(IndexedDiskCache.java:333)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache.initializeStoreFromPersistedData(IndexedDiskCache.java:285)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache.initializeKeysAndData(IndexedDiskCache.java:249)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache.<init>(IndexedDiskCache.java:182)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache.<init>(IndexedDiskCache.java:154)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory.createCache(IndexedDiskCacheFactory.java:61)

Here is a patch.
We need an ElementSerializer during IndexedDiskCache object creation because when key read from disk, we need serializer info.

Index: indexed/IndexedDiskCacheFactory.java
===================================================================
— indexed/IndexedDiskCacheFactory.java (revision 1678464)
+++ indexed/IndexedDiskCacheFactory.java (working copy)
@@ -57,9 +57,8 @@
log.debug( "Creating DiskCache for attributes = " + idca );
}

• IndexedDiskCache<K, V> cache = new IndexedDiskCache<K, V>( idca );
  + IndexedDiskCache<K, V> cache = new IndexedDiskCache<K, V>( idca, elementSerializer);
  cache.setCacheEventLogger( cacheEventLogger );
• cache.setElementSerializer(elementSerializer);

return cache;
}

Thanks

Youngho