[jboss-user] [JBoss Cache] - Using JdbmCacheLoader

[Eugeny Balakhonov]

Eugeny Balakhonov [https://community.jboss.org/people/c0ff75] created the discussion

"Using JdbmCacheLoader"

To view the discussion, visit: https://community.jboss.org/message/801763#801763

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Hello!

I want to use JdbmCacheLoader in my configuration for a cache persistence. I have created simple config:

<?xml version="1.0" encoding="UTF-8"?>
<jbosscache xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance http://www.w3.org/2001/XMLSchema-instance"
            xmlns="urn:jboss:jbosscache-core:config:3.2">
    <loaders passivation="false" shared="false">
          <loader
                class="org.jboss.cache.loader.jdbm.JdbmCacheLoader"
                async="false"
                fetchPersistentState="true"
                ignoreModifications="false"
                purgeOnStartup="false">
            <properties>
                location=D:/cache/#data
            </properties>
        </loader> 
    </loaders>   
</jbosscache>

But this isn't working:
1. After a first start of application I see two DB files created in the directory d:/cache/.
2. I don't use cache during application run: I just start it and stop immediately.
3. During a second start of application I see a lot of errors. JBoss cache can't read persistence database which were created during first start. Generic reason: 

Caused by: jdbm.helper.WrappedRuntimeException: org.jboss.cache.loader.jdbm.JdbmFqnComparator
          at jdbm.helper.DefaultSerializer.deserialize(DefaultSerializer.java:99)
          at jdbm.recman.BaseRecordManager.fetch(BaseRecordManager.java:341)
          at jdbm.recman.CacheRecordManager.fetch(CacheRecordManager.java:263)
          at jdbm.recman.CacheRecordManager.fetch(CacheRecordManager.java:242)
          at jdbm.btree.BTree.load(BTree.java:276)
          at org.jboss.cache.loader.jdbm.JdbmCacheLoader.openDatabase(JdbmCacheLoader.java:186)
          at org.jboss.cache.loader.jdbm.JdbmCacheLoader.start(JdbmCacheLoader.java:157)
          at org.jboss.cache.loader.CacheLoaderManager.startCacheLoader(CacheLoaderManager.java:461)

4. If I change in my config file JdbmCacheLoader to FileCacheLoader then cache works fine.

Where is my error in the configuration? How to correctly use JdbmCacheLoader ?
Please help me by good advice  ;) 

Best regards,
Eugeny
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