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https://issues.apache.org/jira/browse/CASSANDRA-6030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13767166#comment-13767166
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Michaël Figuière edited comment on CASSANDRA-6030 at 9/13/13 11:37 PM:
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I believe this is due to the fact you're using a wrong version of LZ4.
In 1.0, {{LZ4Decompressor}} is an interface:
https://github.com/jpountz/lz4-java/blob/1.0/src/java/net/jpountz/lz4/LZ4Decompressor.java
In 1.1 it's an abstract class:
https://github.com/jpountz/lz4-java/blob/1.1/src/java/net/jpountz/lz4/LZ4Decompressor.java
In 1.2 it's an interface:
https://github.com/jpountz/lz4-java/blob/1.2/src/java/net/jpountz/lz4/LZ4Decompressor.java
Cassandra 2.0.0 depends on 1.1 (see
http://repo1.maven.org/maven2/org/apache/cassandra/cassandra-all/2.0.0/cassandra-all-2.0.0.pom)
and DataStax Java Driver 2.0.0-beta1 depends on 1.2.
If you need to use {{cassandra-all}} and the Java Driver, then I can only
suggest you to rebuild the driver 2.0.0-beta1 as found at
https://github.com/datastax/java-driver/tree/2.0.0-beta1 with the appropriate
dependency. We'll consider fixing this conflict in the next beta of the driver.
Note that this is normally not a problem as the Java Driver doesn't depends
(anymore) on {{cassandra-all}}. So when using the {{EmbeddedCassandraService}}
be sure to force {{net.jpountz.lz4 1.1}} in the dependencies of your
application.
was (Author: mfiguiere):
I believe this is due to the fact you're using a wrong version of LZ4.
In 1.0, {{LZ4Decompressor}} is an interface:
https://github.com/jpountz/lz4-java/blob/1.0/src/java/net/jpountz/lz4/LZ4Decompressor.java
In 1.1 it's an abstract class:
https://github.com/jpountz/lz4-java/blob/1.1/src/java/net/jpountz/lz4/LZ4Decompressor.java
In 1.2 it's an interface:
https://github.com/jpountz/lz4-java/blob/1.2/src/java/net/jpountz/lz4/LZ4Decompressor.java
Cassandra 2.0.0 depends on 1.1 (see
http://repo1.maven.org/maven2/org/apache/cassandra/cassandra-all/2.0.0/cassandra-all-2.0.0.pom)
and DataStax Java Driver 2.0.0-beta1 depends on 1.2.
Note that this is normally not a problem as the Java Driver doesn't depends
(anymore) on {{cassandra-all}}. So when using the {{EmbeddedCassandraService}}
be sure to force {{net.jpountz.lz4 1.1}} in the dependencies of your
application.
> java.lang.IncompatibleClassChangeError when starting EmbeddedCassandraService
> -----------------------------------------------------------------------------
>
> Key: CASSANDRA-6030
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6030
> Project: Cassandra
> Issue Type: Bug
> Components: Core, Documentation & website
> Environment: Linux 64 bit Ubuntu, JAVA 1.7
> Reporter: Jinder Aujla
> Attachments: jar hell.png
>
>
> When I try to start EmbeddedCassandraService thus:
> EmbeddedCassandraService cassandra = new EmbeddedCassandraService();
> cassandra.start();
> I get the following exception
> java.lang.IncompatibleClassChangeError: Found interface
> net.jpountz.lz4.LZ4Decompressor, but class was expected
> at
> org.apache.cassandra.io.compress.LZ4Compressor.uncompress(LZ4Compressor.java:84)
> at
> org.apache.cassandra.io.compress.CompressedRandomAccessReader.decompressChunk(CompressedRandomAccessReader.java:116)
> at
> org.apache.cassandra.io.compress.CompressedRandomAccessReader.reBuffer(CompressedRandomAccessReader.java:85)
> at
> org.apache.cassandra.io.util.RandomAccessReader.seek(RandomAccessReader.java:275)
> at
> org.apache.cassandra.io.util.PoolingSegmentedFile.getSegment(PoolingSegmentedFile.java:42)
> at
> org.apache.cassandra.io.sstable.SSTableReader.getFileDataInput(SSTableReader.java:1093)
> at
> org.apache.cassandra.db.columniterator.SimpleSliceReader.<init>(SimpleSliceReader.java:57)
> at
> org.apache.cassandra.db.columniterator.SSTableSliceIterator.createReader(SSTableSliceIterator.java:65)
> at
> org.apache.cassandra.db.columniterator.SSTableSliceIterator.<init>(SSTableSliceIterator.java:42)
> at
> org.apache.cassandra.db.filter.SliceQueryFilter.getSSTableColumnIterator(SliceQueryFilter.java:171)
> at
> org.apache.cassandra.db.filter.QueryFilter.getSSTableColumnIterator(QueryFilter.java:62)
> at
> org.apache.cassandra.db.CollationController.collectAllData(CollationController.java:269)
> at
> org.apache.cassandra.db.CollationController.getTopLevelColumns(CollationController.java:53)
> at
> org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1469)
> at
> org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1295)
> at org.apache.cassandra.db.Keyspace.getRow(Keyspace.java:332)
> at
> org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.java:65)
> at
> org.apache.cassandra.cql3.statements.SelectStatement.readLocally(SelectStatement.java:231)
> at
> org.apache.cassandra.cql3.statements.SelectStatement.executeInternal(SelectStatement.java:249)
> at
> org.apache.cassandra.cql3.statements.SelectStatement.executeInternal(SelectStatement.java:56)
> at
> org.apache.cassandra.cql3.QueryProcessor.processInternal(QueryProcessor.java:151)
> at
> org.apache.cassandra.db.SystemKeyspace.checkHealth(SystemKeyspace.java:459)
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:227)
> at
> org.apache.cassandra.service.CassandraDaemon.init(CassandraDaemon.java:377)
> at
> org.apache.cassandra.service.EmbeddedCassandraService.start(EmbeddedCassandraService.java:52)
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