Weird exception: Cannot instantiate non-persistent class: java.util.Map

Question

java.lang.UnsupportedOperationException: Cannot instantiate non-persistent class: java.util.Map
     at com.sleepycat.persist.impl.NonPersistentFormat.newInstance(NonPersistentFormat.java:45)
     at com.sleepycat.persist.impl.PersistEntityBinding.readEntity(PersistEntityBinding.java:89)
     at com.sleepycat.persist.impl.PersistEntityBinding.entryToObject(PersistEntityBinding.java:61)
     at com.sleepycat.persist.PrimaryIndex.put(PrimaryIndex.java:338)
     at com.sleepycat.persist.PrimaryIndex.put(PrimaryIndex.java:299)
     at com.xx.support.dbd.IdentityDataAccessor.insert(IdentityDataAccessor.java:33)
     at com.xx.support.dbd.BerkeleyDBAccountStorage.saveUser(BerkeleyDBAccountStorage.java:95)
     at com.xx.support.bdb.BerkeleyDBAccountStorageTests.initBerkeleyDBData(BerkeleyDBAccountStorageTests.java:38)
     at com.xx.support.bdb.BerkeleyDBAccountStorageTests.setUp(BerkeleyDBAccountStorageTests.java:28)
     at junit.framework.TestCase.runBare(TestCase.java:125)
     at junit.framework.TestResult$1.protect(TestResult.java:106)
     at junit.framework.TestResult.runProtected(TestResult.java:124)
     at junit.framework.TestResult.run(TestResult.java:109)
     at junit.framework.TestCase.run(TestCase.java:118)
     at junit.framework.TestSuite.runTest(TestSuite.java:208)
     at junit.framework.TestSuite.run(TestSuite.java:203)
What's the root cause of this exception?

Answer 1

I wrote a small test using the classes you included
in your message and I am able to retrieve the user by
key, as in the code above. So I'm not sure what
you're doing that is causing the problem. Please
send a small test that reproduces the problem.Oops, I forgot to include the source for the test I wrote. Here it is.
import java.io.File;
import java.util.HashMap;
import java.util.Map;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.Environment;
import com.sleepycat.je.EnvironmentConfig;
import com.sleepycat.persist.EntityStore;
import com.sleepycat.persist.PrimaryIndex;
import com.sleepycat.persist.StoreConfig;
import com.sleepycat.persist.model.Entity;
import com.sleepycat.persist.model.Persistent;
import com.sleepycat.persist.model.PrimaryKey;
public class Test {
    @Persistent
    public static class SimplePrincipal {
        protected String name;
        public SimplePrincipal(String username) {
            this.name = name;
        public SimplePrincipal() {}
    @Entity
    public static class SimpleUser extends SimplePrincipal {
        @PrimaryKey
        private String key;
        private Map properties;
        public SimpleUser() {
            super();
            this.properties = new HashMap();
        public SimpleUser(String username) {
            super(username);
            this.properties = new HashMap();
        public void setKey(String key){
            this.key = key;
        public void addPropertity(String name, String value) {
            this.properties.put(name, value);
        @Override
        public String toString() {
            return "[SimpleUser key: " + key + " name: " + name + ']';
    private Environment env;
    private EntityStore store;
    private PrimaryIndex<String, SimpleUser> primaryIndex;
    private void open()
        throws DatabaseException {
        EnvironmentConfig envConfig = new EnvironmentConfig();
        envConfig.setAllowCreate(true);
        envConfig.setTransactional(true);
        env = new Environment(new File("./data"), envConfig);
        StoreConfig storeConfig = new StoreConfig();
        storeConfig.setAllowCreate(true);
        storeConfig.setTransactional(true);
        store = new EntityStore(env, "test", storeConfig);
        primaryIndex = store.getPrimaryIndex(String.class, SimpleUser.class);
    private void close()
        throws DatabaseException {
        store.close();
        env.close();
    private void execute()
        throws DatabaseException {
        SimpleUser user = new SimpleUser("test");
        user.setKey("testkey");
        primaryIndex.put(user);
        user = primaryIndex.get("testkey");
        System.out.println(user);
    public static void main(String[] args)
        throws DatabaseException {
        Test test = new Test();
        test.open();
        test.execute();
        test.close();
}Mark