Andrus Adamchik commented on CAY-1034:
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Hmm... byte[] PK's worked just fine, and there is no need to convert them to String... What we need to do is to determine what environment causes this error... I incorrectly assumed PostgreSQL in my mailing list message. But from the stack trace this is MySQL... But the question remains - what MySQL column type this is and how is it mapped in Cayenne?
> ObjectId key singleValue is byte[]
> ----------------------------------
>
> Key: CAY-1034
> URL: https://issues.apache.org/cayenne/browse/CAY-1034
> Project: Cayenne
> Issue Type: Bug
> Components: Cayenne Core Library
> Affects Versions: 3.0
> Environment: Cayenne 3.0 M3, JDK 1.5.0_15
> Reporter: Malcolm Edgar
> Assignee: Andrus Adamchik
> Attachments: ObjectId.java
>
>
> I have a nasty problem with attempting to perform a refetchObject() on a hollow object. This is the DataObject toString(), note the primary key column 'schema_config_oid' has a value of '..eaf8c>'
> The primary key column of this database is an BIGINT, this table only has one record and its PK value is '1'
> {<ObjectId:SchemaConfig, schema_config_oid=[..eaf8c>; hollow; []}
> When I try to refetchObject(), I get a stacktrace of:
> Caused by: java.sql.SQLException: Cannot convert class [B to SQL type requested due to java.lang.ClassCastException - [B
> at com.mysql.jdbc.PreparedStatement.setObject(PreparedStatement.java:2744)
> at com.mysql.jdbc.PreparedStatement.setObject(PreparedStatement.java:2532)
> at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.setObject(WrappedPreparedStatement.java:420)
> at org.apache.cayenne.access.types.AbstractType.setJdbcObject(AbstractType.java:79)
> at org.apache.cayenne.access.types.ByteArrayType.setJdbcObject(ByteArrayType.java:191)
> at org.apache.cayenne.dba.JdbcAdapter.bindParameter(JdbcAdapter.java:481)
> at org.apache.cayenne.access.trans.QueryAssembler.initStatement(QueryAssembler.java:123)
> at org.apache.cayenne.access.trans.QueryAssembler.createStatement(QueryAssembler.java:99)
> at org.apache.cayenne.access.jdbc.SelectAction.performAction(SelectAction.java:71)
> at org.apache.cayenne.access.DataNodeQueryAction.runQuery(DataNodeQueryAction.java:58)
> at org.apache.cayenne.access.DataNode.performQueries(DataNode.java:230)
> ... 60 more
> Some more analysis on this problem the ObjectId singleValue value is a byte[] of the table primary key value "3456", and the ObjectId is returning the raw byte array as the single primary key value.
> This is making a mess of Cayenne refreshing objects, lazy loading, etc.
> I am wondering if this is a JDK 1.5 coercion issue, I have never seen this issue before with JDK 1.4 and Cayenne 1.x.
> A solution to this problem is provided in the attached org.apache.cayenne.ObjectId file.
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