Re: R: R: Error getting DataContext

Andrus Adamchik Fri, 04 Sep 2009 06:39:10 -0700

Since Cayenne relies on thread ClassLoader to load classesdynamically, you may try to fake that under OSGi. BTW, what's the"standard" way to get a contextual ClassLoader in the OSGi environment- we may add that as a strategy to Cayenne?


Anyways, assuming you know the answer to the above:


ClassLoader bundleCL = ...
ClassLoader oldCL = Thread.currentThread().getContextClassLoader();

Thread.currentThread().setContextClassLoader(bundleCL);

// init cayenne...
...

Thread.currentThread().setContextClassLoader(oldCL);

Andrus

On Sep 4, 2009, at 4:18 PM, Cristiano Ghersi wrote:

This is the stackTrace:

****************************************************************************
*********************************
Sep 4, 2009 3:17:14 PM org.apache.cayenne.conf.RuntimeLoadDelegate
startedLoading
INFO: started configuration loading.
Sep 4, 2009 3:17:14 PM org.apache.cayenne.conf.RuntimeLoadDelegate
shouldLoadDataDomain
INFO: loaded domain: PacketDomain
Sep 4, 2009 3:17:14 PM org.apache.cayenne.conf.RuntimeLoadDelegate
loadDataMap
INFO: loaded <map name='PacketMap' location='PacketMap.map.xml'>.
Sep 4, 2009 3:17:14 PM org.apache.cayenne.conf.RuntimeLoadDelegate
shouldLoadDataNode

INFO: loading <node name='PacketNode'datasource='PacketNode.driver.xml'

factory='org.apache.cayenne.conf.DriverDataSourceFactory'

schema-update-strategy='org.apache.cayenne.access.dbsync.SkipSchemaUpdateStr

ategy'>.
java.lang.ClassCastException:

org.apache.cayenne.access.dbsync.SkipSchemaUpdateStrategy cannot becast to

org.apache.cayenne.access.dbsync.SchemaUpdateStrategy
        at

org.apache.cayenne.conf.RuntimeLoadDelegate.shouldLoadDataNode(RuntimeLoadDe

legate.java:303)
        at

org.apache.cayenne.conf.ConfigLoader$NodeHandler.init(ConfigLoader.java:345)

at

org.apache.cayenne.conf.ConfigLoader$DomainHandler.startElement(ConfigLoader

.java:222)
        at

com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Ab

stractSAXParser.java:501)
        at

com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartEl

ement(XMLNSDocumentScannerImpl.java:400)
        at

com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$Fragm

entContentDriver.next(XMLDocumentFragmentScannerImpl.java:2747)
        at

com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocum

entScannerImpl.java:648)
        at

com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSD

ocumentScannerImpl.java:140)
        at

com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanD

ocument(XMLDocumentFragmentScannerImpl.java:510)
        at

com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Con

figuration.java:807)
        at

com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Con

figuration.java:737)
        at

com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:10

7)
        at

com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractS

AXParser.java:1205)
        at

com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SA

XParserImpl.java:522)
        at
org.apache.cayenne.conf.ConfigLoader.loadDomains(ConfigLoader.java:78)
        at

org.apache.cayenne.conf.DefaultConfiguration.initialize(DefaultConfiguration

.java:152)
        at dbManager.DbManager.<init>(DbManager.java:43)
        at zzz_bundledbquery.DBQueryStarter.start(DBQueryStarter.java:28)
        at

org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleConte

xtImpl.java:782)
        at java.security.AccessController.doPrivileged(Native Method)
        at

org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(Bu

ndleContextImpl.java:773)
        at

org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleConte

xtImpl.java:754)
        at

org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.j

ava:352)
        at

org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundl

e.java:370)
        at

org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.ja

va:1068)
        at

org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(Sta

rtLevelManager.java:557)
        at

org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLeve

lManager.java:464)
        at

org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(S

tartLevelManager.java:248)
        at

org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(Sta

rtLevelManager.java:445)
        at

org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.

java:220)
        at

org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManage

r.java:330)
****************************************************************************
*********************************

Thanks
Cristiano

-----Messaggio originale-----
Da: Andrus Adamchik [mailto:[email protected]]
Inviato: venerdì 4 settembre 2009 15.10
A: [email protected]
Oggetto: Re: R: Error getting DataContext

Hmm... Could you actually post the new stack trace? For one  thing it
should not contain this anymore:

at
org
.apache
.cayenne.conf.Configuration.initializeSharedConfiguration(Configur
ation.java:168)

Andrus

On Sep 4, 2009, at 3:49 PM, Cristiano Ghersi wrote:

Hi Andrus,



Thank you for your fast reply!



I tried with the following as you have proposed:



String pathWithConfigurationFiles = System.getProperty("user.dir") +
"/config/cayenne";

config = new FileConfiguration("cayenne.xml");

((FileConfiguration) config).addFilesystemPath(new
File(pathWithConfigurationFiles));

config.initialize();

context = config.getDomain().createDataContext();



Unfortunately this code doesn't solve the issue, still present with
the same
StackTrace.



Other ideas?



Thank you very much for the help!

Cristiano

****************************************************************************

*********+





Hi there,



Looks like a static Configuration singleton is causing a problem.

Could you just keep 2 Configurations separate and avoid using

'initializeSharedConfiguration'. E.g.:



Configuration conf = ...;

conf.initialize();

// store conf reference for later use



...

// use a stored conf to create the context:

DataContext context = conf.getDomain().createDataContext();



Hope this helps.

Andrus





On Sep 3, 2009, at 6:56 PM, Cristiano Ghersi wrote:



Good morning,



I've got a problem using the static method
DataContext.createDataContext();



My environment is the following: I've got a library (let's call it
"DataLayer") which use cayenne for the communication towards a
single DB.

In this library a class called DbManager create a DataContext in its
constructor using this piece of code:



try {

String pathWithConfigurationFiles = "/home/matteo/config/cayenne";

org.apache.cayenne.conf.Configuration conf = new
FileConfiguration("cayenne.xml");



// Cayenne configuration files can be found at this location

((FileConfiguration) conf).addFilesystemPath(new
File(pathWithConfigurationFiles));

org
.apache
.cayenne.conf.Configuration.initializeSharedConfiguration(conf);

} catch (Exception e){

              e.printStackTrace();

}



// Create a new one

context = DataContext.createDataContext();





This library is used by two different bundles (OSGi Framework);
let's call
these bundles Bundle1 and Bundle2.



If I use only one of these bundles all goes perfectly well, but if I
try to
start Bundle2 when Bundle1 is already started, the following error
appears
and Bundle2 is stopped:



INFO: loading <node name='PacketNode'
datasource='PacketNode.driver.xml'
factory='org.apache.cayenne.conf.DriverDataSourceFactory'
schema-update-
strategy='org.apache.cayenne.access.dbsync.SkipSchemaUpdateStr
ategy'>.

org.apache.cayenne.ConfigurationException: [v.3.0M6 May 18 2009
07:49:46]
Error during Configuration initialization.
org.apache.cayenne.access.dbsync.SkipSchemaUpdateStrategy cannot be
cast to
org.apache.cayenne.access.dbsync.SchemaUpdateStrategy

              at
org
.apache
.cayenne.conf.Configuration.initializeSharedConfiguration(Configur
ation.java:168)

              at dbManager.DbManager.<init>(DbManager.java:58)

              at
zzz_bundledbquery.DBQueryStarter.start(DBQueryStarter.java:20)

              at
org.eclipse.osgi.framework.internal.core.BundleContextImpl
$1.run(BundleConte
xtImpl.java:782)

              at java.security.AccessController.doPrivileged(Native
Method)

              at
org
.eclipse
.osgi.framework.internal.core.BundleContextImpl.startActivator(Bu
ndleContextImpl.java:773)

              at
org
.eclipse
.osgi.framework.internal.core.BundleContextImpl.start(BundleConte
xtImpl.java:754)

              at
org
.eclipse
.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.j
ava:352)

              at
org
.eclipse
.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle
.java:280)

              at
org
.eclipse
.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle
.java:272)

              at
org
.eclipse
.osgi.framework.internal.core.FrameworkCommandProvider._start(Fra
meworkCommandProvider.java:253)

              at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)

              at
sun
.reflect
.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)

              at
sun
.reflect
.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)

              at java.lang.reflect.Method.invoke(Method.java:597)

              at
org
.eclipse
.osgi.framework.internal.core.FrameworkCommandInterpreter.execute
(FrameworkCommandInterpreter.java:155)

              at
org
.eclipse
.osgi.framework.internal.core.FrameworkConsole.docommand(Framewor
kConsole.java:303)

              at
org
.eclipse
.osgi.framework.internal.core.FrameworkConsole.console(FrameworkC
onsole.java:288)

              at
org
.eclipse
.osgi.framework.internal.core.FrameworkConsole.run(FrameworkConso
le.java:224)

              at java.lang.Thread.run(Thread.java:619)

Caused by: java.lang.ClassCastException:
org.apache.cayenne.access.dbsync.SkipSchemaUpdateStrategy cannot be
cast to
org.apache.cayenne.access.dbsync.SchemaUpdateStrategy

              at
org
.apache
.cayenne.conf.RuntimeLoadDelegate.shouldLoadDataNode(RuntimeLoadDe
legate.java:303)

              at
org.apache.cayenne.conf.ConfigLoader
$NodeHandler.init(ConfigLoader.java:345)

              at
org.apache.cayenne.conf.ConfigLoader
$DomainHandler.startElement(ConfigLoader
.java:222)

              at
com
.sun
.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Ab
stractSAXParser.java:501)

              at
com
.sun
.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartEl
ement(XMLNSDocumentScannerImpl.java:400)

              at
com
.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl
$Fragm
entContentDriver.next(XMLDocumentFragmentScannerImpl.java:2747)

              at
com
.sun
.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocum
entScannerImpl.java:648)

              at
com
.sun
.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSD
ocumentScannerImpl.java:140)

              at
com
.sun
.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanD
ocument(XMLDocumentFragmentScannerImpl.java:510)

              at
com
.sun
.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Con
figuration.java:807)

              at
com
.sun
.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Con
figuration.java:737)

              at
com
.sun
.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:10
7)

              at
com
.sun
.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractS
AXParser.java:1205)

              at
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl
$JAXPSAXParser.parse(SA
XParserImpl.java:522)

              at

org.apache.cayenne.conf.ConfigLoader.loadDomains(ConfigLoader.java:78)


              at
org
.apache
.cayenne.conf.DefaultConfiguration.initialize(DefaultConfiguration
.java:152)

              at
org
.apache
.cayenne.conf.Configuration.initializeSharedConfiguration(Configur
ation.java:159)

              ... 19 more





What I'm missing?



Thank you very much for the help!!



Cristiano Ghersi


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09/04/09 05:51:00

Re: R: R: Error getting DataContext

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