Error: 'Database handles still open at environment close'

Question

Hello,
I have read information about this error, but I cannot solve it.
I think I have closed all objects that I use, but the error appears.
When I remove next code, the error doesn't appear:
while (xmlValue != null) {
XmlDocument theDoc = xmlValue.asDocument();
String docName = theDoc.getName();
String docString = xmlValue.asString();
String message = "Document ";
message += theDoc.getName() + ":\n";
message += xmlValue.asString();
message += "===============================\n";
System.out.println(message);
xmlValue = results.next();
theDoc.delete();
The error:
Database handles still open at environment close
Open database handle: myContainer.dbxml/secondary_document_statistics_string
Open database handle: myContainer.dbxml/secondary_document_index_string
Open database handle: myContainer.dbxml/node_nodestorage
Open database handle: myContainer.dbxml/secondary_document
Open database handle: myContainer.dbxml/secondary_dictionary
Open database handle: myContainer.dbxml/primary_dictionary
Open database handle: myContainer.dbxml/secondary_sequence
Open database handle: myContainer.dbxml/secondary_configuration
Exception in thread "main" java.lang.IllegalArgumentException: Invalid argument
at com.sleepycat.db.internal.db_javaJNI.DbEnv_close0(Native Method)
at com.sleepycat.db.internal.DbEnv.close0(DbEnv.java:217)
at com.sleepycat.db.internal.DbEnv.close(DbEnv.java:77)
at com.sleepycat.db.Environment.close(Environment.java:39)
at berkeleydbxml.Test1.main(Test1.java:137)
Java Result: 1
The code:
public static void main(String[] args) {
Environment myEnv = null;
File envHome = new File("C:/extranet/tecnologias/BerkeleyDBXML/Java/BerkeleyDBXML/dbxml");
XmlManager myManager = null;
XmlContainer myContainer = null;
XmlQueryContext context = null;
try {
EnvironmentConfig envConf = new EnvironmentConfig();
envConf.setAllowCreate(true); // If the environment does not
// exits, create it.
envConf.setInitializeCache(true); // Turn on the shared memory
// region.
envConf.setInitializeLocking(true); // Turn on the locking subsystem.
envConf.setInitializeLogging(true); // Turn on the logging subsystem.
envConf.setTransactional(true); // Turn on the transactional
// subsystem.
myEnv = new Environment(envHome, envConf);
XmlManagerConfig managerConfig = new XmlManagerConfig();
myManager = new XmlManager(myEnv, managerConfig);
XmlContainerConfig containerConf = new XmlContainerConfig();
containerConf.setTransactional(true);
containerConf.setAllowCreate(true);
String containerName = "myContainer.dbxml";
myContainer = myManager.openContainer(containerName, containerConf);
// Get a query context
context = myManager.createQueryContext();
// Declares namespaces
// Default namespace
context.setNamespace("", "urn:oasis:names:specification:ubl:schema:xsd:Invoice-2");
context.setNamespace("cac", "urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2");
context.setNamespace("cbc", "urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2");
context.setNamespace("ccts", "urn:un:unece:uncefact:documentation:2");
context.setNamespace("ext", "urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2");
context.setNamespace("qdt", "urn:oasis:names:specification:ubl:schema:xsd:QualifiedDatatypes-2");
context.setNamespace("udt", "urn:un:unece:uncefact:data:specification:UnqualifiedDataTypesSchemaModule:2");
// Declare the query string
String myQuery =
"collection('myContainer.dbxml')/Invoice";
// Prepare (compile) the query
XmlQueryExpression qe = myManager.prepare(myQuery, context);
// Run the query. Note that you can perform this query many times
// without suffering the overhead of re-creating the query expression.
// Notice that the only thing we are changing is the variable value,
// which allows us to control exactly what gets returned for the
// query.
XmlResults results = qe.execute(context);
// Display the result set
XmlValue xmlValue = results.next();
while (xmlValue != null) {
XmlDocument theDoc = xmlValue.asDocument();
String docName = theDoc.getName();
String docString = xmlValue.asString();
String message = "Document ";
message += theDoc.getName() + ":\n";
message += xmlValue.asString();
message += "===============================\n";
System.out.println(message);
xmlValue = results.next();
theDoc.delete();
xmlValue.delete(); <-- the error happens here
qe.delete();
results.delete();
} catch (DatabaseException de) {
// Exception handling goes here
int i = 1;
} catch (FileNotFoundException fnfe) {
// Exception handling goes here
int i=1;
} catch (Exception e) {
// Exception handling goes here
int i = 2;
} finally {
try {
if (myContainer != null) {
myContainer.close();
if (myManager != null) {
myManager.close();
if (myEnv != null) {
myEnv.close();
} catch (DatabaseException de) {
// Exception handling goes here
If I remove the xmlValue.delete() sentence, the error appears in myEnv.close().
I use berkeley 2.3.10 version, Windows XP.
Thanks.

Answer 1

I am having a similar problem. My method:
protected void searchQuestions(String keyword) throws LibraryException {
XmlQueryContext xqc = null;
XmlResults xr = null;
XmlQueryExpression xqe = null;
String[] qids = null;
String query = "collection()/*[contains(question, '" + keyword + "')]";
try {
conQuestions = man.openContainer(QUESTION_CONTAINER);
xqc = man.createQueryContext();
xqc.setDefaultCollection(QUESTION_CONTAINER);
xqe = man.prepare(query, xqc);
xr = xqe.execute(xqc);
conQuestions.delete();
xqc.delete();
xqe.delete();
XmlValue val = xr.next();
while (val != null) {
String name = val.asDocument().getName();
System.out.println(name);
val = xr.next();
val.delete(); <-- PROBLEM HERE
xr.delete();
} catch (XmlException xe) {
throw new LibraryException("Unable to search for questions. " + xe.getMessage());
If I leave the val.delete() line then I get a java.lang.NullPointerException but if I remove it then I get an error stating 'Database handles still open at environment close'. I run a clean up method after the previous method as follows:
protected void close() {
if(conQuizes != null)
conQuizes.delete();
if(conQuestions != null)
conQuestions.delete();
if(conUsers != null)
conUsers.delete();
if(man != null)
man.delete();
I have many other methods that interact with containers perfectly but this is the only one where I use the XmlValue class. I tried the solution that worked for brais.mendez with no luck. Any advise or ideas would be much appreciated.
Thanks,
Matt