Error during database recover

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Olaf van der Meer

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May 13, 2024, 5:51:07 AMMay 13

to H2 Database

Hi,

I am trying to repair a corrupt database, but the recover runs in an error:

Caused by: java.lang.NullPointerException
org.h2.mvstore.DataUtils.parseMap(DataUtils.java:804)
org.h2.mvstore.Chunk.<init>(Chunk.java:171)
org.h2.mvstore.SFChunk.<init>(SFChunk.java:26)
org.h2.mvstore.MVStoreTool.dump(MVStoreTool.java:151)
org.h2.tools.Recover.process(Recover.java:242)
org.h2.tools.Recover.execute(Recover.java:226)

I noticed someone else has report this too https://github.com/h2database/h2database/issues/4020

I have looked into the MvStoreTool.java and changed the try .. catch arround the line 151 to catch all exceptions:

try {
c = new SFChunk(Chunk.readChunkHeader(buffer));
//} catch (MVStoreException e) {
} catch (Exception e) {
pos += blockSize;
continue;
}

Now it can run further and the recover produces an h2.sql dump.

Is this a good fix for this issue?

I was also wondering where wondering where the mv.txt dump file is used for.

I only need the h2.sql dump to recover the database.

Olaf van der Meer

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May 14, 2024, 6:18:53 AMMay 14

to H2 Database

Hi,

I see it has been fixed Nov 26, 2023 https://github.com/h2database/h2database/commit/51427805f05782adda33f3c1ccc464544e0d2273

by throwing a MVStoreException in Chunk.readChunkHeader()

Still have this question: I was also wondering where the mv.txt dump file is used for. I only need the h2.sql dump to recover the database.

Does anyone has got know when a new release will be released, so we can use this patch? The last release is from Sept 2023?