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POType mismatch when using Astyanax (Cassandra client) via Scala
 

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  1. POType mismatch when using Astyanax (Cassandra client) via Scala
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    <p>I'm trying to use the Java Cassandra client Astyanax via Scala, but receiving this compile error:</p> <pre><code>[error] /massrel/metrics-batcher/src/main/scala/com/massrel/batcher/MetricsWriter.scala:35: type mismatch; [error] found : com.netflix.astyanax.model.ColumnFamily[java.nio.ByteBuffer,java.lang.Long] [error] required: com.netflix.astyanax.model.ColumnFamily[java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Object]],java.lang.Long] [error] Note: java.nio.ByteBuffer &lt;: java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Object]], but Java-defined class ColumnFamily is invariant in type K. [error] You may wish to investigate a wildcard type such as `_ &lt;: java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Object]]`. (SLS 3.2.10) [error] m.withRow(CF_M, "foo").incrementCounterColumn(0, 1) [error] ^ [error] /massrel/metrics-batcher/src/main/scala/com/massrel/batcher/MetricsWriter.scala:36: type mismatch; [error] found : com.netflix.astyanax.model.ColumnFamily[java.nio.ByteBuffer,java.lang.Long] [error] required: com.netflix.astyanax.model.ColumnFamily[java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Object]],java.lang.Long] [error] Note: java.nio.ByteBuffer &lt;: java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Object]], but Java-defined class ColumnFamily is invariant in type K. [error] You may wish to investigate a wildcard type such as `_ &lt;: java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Comparable[_ &gt;: java.lang.String with java.nio.ByteBuffer &lt;: java.lang.Object]]`. (SLS 3.2.10) [error] m.withRow(CF_M, "bar").incrementCounterColumn(0, 1) [error] ^ </code></pre> <p>Here's the code in question:</p> <pre><code>package com.massrel.batcher import java.nio.ByteBuffer import scala.collection.mutable.{Map =&gt; MMap} import com.netflix.astyanax._ import com.netflix.astyanax.impl._ import com.netflix.astyanax.connectionpool._ import com.netflix.astyanax.connectionpool.impl._ import com.netflix.astyanax.thrift._ import com.netflix.astyanax.model._ import com.netflix.astyanax.serializers._ class MetricsWriter { val context: AstyanaxContext[Keyspace] = new AstyanaxContext.Builder() .forCluster("cluster1") .forKeyspace("dev1") .withAstyanaxConfiguration(new AstyanaxConfigurationImpl() .setDiscoveryType(NodeDiscoveryType.RING_DESCRIBE) .setConnectionPoolType(ConnectionPoolType.TOKEN_AWARE) ) .withConnectionPoolConfiguration(new ConnectionPoolConfigurationImpl("connectionpool1") .setPort(9160) .setMaxConnsPerHost(1) .setSeeds("127.0.0.1:9160") ) .withConnectionPoolMonitor(new CountingConnectionPoolMonitor()) .buildKeyspace(ThriftFamilyFactory.getInstance()); context.start() val keyspace = context.getEntity() val CF_M = new ColumnFamily[ByteBuffer, java.lang.Long]("M", ByteBufferSerializer.get(), LongSerializer.get()) def writeTest() { val m = keyspace.prepareMutationBatch() m.withRow(CF_M, "foo").incrementCounterColumn(0, 1) m.withRow(CF_M, "bar").incrementCounterColumn(0, 1) m.execute() } } </code></pre> <p>What can I do in my code to get around the issue?</p> <p>If it helps, you can view the Astyanax code here: <a href="https://github.com/Netflix/astyanax" rel="nofollow">https://github.com/Netflix/astyanax</a></p>
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    1. This table or related slice is empty.
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    1. USBrett
    1. USBrett
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POType mismatch when using Astyanax (Cassandra client) via Scala
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    1. COWell, if I change to a String/StringSerializer it compiles fine... color me confused.
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      1. POType mismatch when using Astyanax (Cassandra client) via Scala
      1. USBrett
 

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