A bizarre ClassCastException is thrown if I attempt to obtain a byte array field as the result of a Query:
Exception in thread "main" java.lang.ClassCastException: java.lang.Boolean cannot be cast to [B
at spiffy.test.ObjectdbTest.main(ObjectdbTest.java:44)
package spiffy.test;
import java.util.List;
import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManager;
import javax.jdo.PersistenceManagerFactory;
import javax.jdo.Query;
import spiffy.test.model.Example;
/**
*
* @author steve
*/
public class ObjectdbTest {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory("test.odb");
PersistenceManager pm = pmf.getPersistenceManager();
// Clear out existing objects
pm.currentTransaction().begin();
Query query = pm.newQuery(Example.class);
query.deletePersistentAll();
pm.currentTransaction().commit();
pm.currentTransaction().begin();
Example example1 = new Example();
example1.setId(1);
example1.setName("name1");
example1.setData(new byte[1]);
example1.getData()[0] = 123;
Example example2 = new Example();
example2.setId(2);
example2.setName("name2");
example2.setData(new byte[2]);
example2.getData()[0] = 12;
pm.makePersistent(example1);
pm.makePersistent(example2);
pm.currentTransaction().commit();
query = pm.newQuery(Example.class, "name == :name");
query.setResult("data");
List<byte[]> dataList = (List<byte[]>) query.execute("name1");
for (byte[] data : dataList) {
System.out.print(data);
}
}
}
package spiffy.test.model;
/**
*
* @author steve
*/
public class Example {
private long id;
private String name;
private byte[] data;
/**
* @return the id
*/
public long getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(long id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the data
*/
public byte[] getData() {
return data;
}
/**
* @param data the data to set
*/
public void setData(byte[] data) {
this.data = data;
}
}
<?xml version="1.0"?>
<jdo xmlns="http://xmlns.jcp.org/xml/ns/jdo/jdo"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/jdo/jdo
http://xmlns.jcp.org/xml/ns/jdo/jdo_2_0.xsd" version="2.0">
<package name="spiffy.test.model">
<class name="Example">
<field name="id" primary-key="true"/>
<field name="name" persistence-modifier="persistent"/>
<field name="data" persistence-modifier="persistent"/>
</class>
</package>
</jdo>
