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
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 below in the patch to org.apache.cayenne.ObjectId.
+ /**
+ * Creates a portable permanent ObjectId as a compound primary key.
+ *
+ *..aram entityName The entity name which this object id is for
+ *..aram idMap Keys are usually the attribute names for each part of the primary key.
+ * Values are unique when taken as a whole.
+ *..ince 1.2
+ */
+ public ObjectId(String entityName, Map<String, ?> idMap) {
+ this.entityName = entityName;
+
+ if (idMap == null || idMap.size() == 0) {
+
+ }
+ else if (idMap.size() == 1) {
+ Map.Entry<String, ?> e = idMap.entrySet().iterator().next();
+ this.singleKey = String.valueOf(e.getKey());
+
+ if (e.getValue() != null) {
+ Class valueClass = e.getValue().getClass();
+ if (valueClass.isArray()) {
+ if ("byte[]".equals(valueClass.getCanonicalName())) {
+ this.singleValue = new String((byte[]) e.getValue());
+ }
+ }
+ }
+
+ if (this.singleValue == null) {
+ this.singleValue = e.getValue();
+ }
+ }
+ else {
+
+ // we have to create a copy of the map, otherwise we may run into
+ // serialization
+ // problems with hessian
+ this.objectIdKeys = new HashMap<String, Object>(idMap);
+ }
+ }
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