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Posted to user@cayenne.apache.org by Andrew Willerding <aw...@itsurcom.com> on 2019/10/17 03:24:16 UTC
Cayenne and classpath question and help
Hi,
I have an application that dynamically loads jar files and reloads them
when they are changed. Unfortunately I'm have an issue getting Cayenne
to see the classes inside one of these dynamically loaded jar files. I
have some test code that looks roughly like this.
import com.dbclientbase.Database.Account;
public class blah
public testMethod(){
Account ac = new Account(); // This object instantiates
without an error so it's visible to app outside of Cayenne
ObjectContext oc = DBClientBase.getObjectContext(); // This
method generates the ServerRuntime and fails to get an ObjectContext to
work with (error below)
}
}
The error output below seems to suggest that Cayenne cannot access the
Account class although I can successfully instantiate a non-Cayenne
object. What can I do to ensure that Cayenne also has access to the
contents of a dynamically loaded and reloaded jar file? I have found
references to AdhocObjectFactory.getClassLoader() but I can't find any
examples on how to use it and I'm quite at a loss on how to even begin
use it.
Thanks,
Andrew
Exception==>org.apache.cayenne.configuration.server.DataDomainLoadException:
[v.4.1.B2 May 04 2019 09:30:14] DataDomain startup failed: Invalid
class: com.dbclientbase.Database$Account
at
org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:123)
at
org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:60)
at
org.apache.cayenne.di.spi.CustomProvidersProvider.get(CustomProvidersProvider.java:39)
at
org.apache.cayenne.di.spi.FieldInjectingProvider.get(FieldInjectingProvider.java:43)
at
org.apache.cayenne.di.spi.DefaultScopeProvider.get(DefaultScopeProvider.java:50)
at
org.apache.cayenne.di.spi.DefaultInjector.getInstance(DefaultInjector.java:139)
at
org.apache.cayenne.di.spi.FieldInjectingProvider.value(FieldInjectingProvider.java:103)
at
org.apache.cayenne.di.spi.FieldInjectingProvider.injectMember(FieldInjectingProvider.java:68)
at
org.apache.cayenne.di.spi.FieldInjectingProvider.injectMembers(FieldInjectingProvider.java:59)
at
org.apache.cayenne.di.spi.FieldInjectingProvider.get(FieldInjectingProvider.java:44)
at
org.apache.cayenne.di.spi.DefaultScopeProvider.get(DefaultScopeProvider.java:50)
at
org.apache.cayenne.di.spi.DefaultInjector.getInstance(DefaultInjector.java:134)
at
org.apache.cayenne.configuration.CayenneRuntime.newContext(CayenneRuntime.java:124)
at
com.dbclientbase.DBClientBase.getObjectContext(DBClientBase.java:100)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.apache.cayenne.di.DIRuntimeException: Invalid class:
com.Database$Account
at
org.apache.cayenne.di.spi.DefaultAdhocObjectFactory.getJavaClass(DefaultAdhocObjectFactory.java:128)
at org.apache.cayenne.util.Util.getJavaClass(Util.java:632)
at org.apache.cayenne.map.ObjEntity.getJavaClass(ObjEntity.java:265)
at
org.apache.cayenne.map.EntityResolver.initCallbacks(EntityResolver.java:141)
at
org.apache.cayenne.map.EntityResolver.getCallbackRegistry(EntityResolver.java:163)
at
org.apache.cayenne.access.DataDomain.addListener(DataDomain.java:791)
at
org.apache.cayenne.access.DataDomain.addSyncFilter(DataDomain.java:748)
at
org.apache.cayenne.configuration.server.DataDomainProvider.createAndInitDataDomain(DataDomainProvider.java:188)
at
org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:117)
... 16 more
Caused by: java.lang.ClassNotFoundException:
com.dbclientbase.Database.Account
at
java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
at
java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:398)
at
org.apache.cayenne.di.spi.DefaultAdhocObjectFactory.getJavaClass(DefaultAdhocObjectFactory.java:93)
... 24 more
Re: Cayenne and classpath question and help
Posted by Andrew Willerding <aw...@itsurcom.com>.
I'm not a JRebel user...
On 2019-10-17 7:02 a.m., Michael Gentry wrote:
> Hi Andrew,
>
> Are you using JRebel? I seem to recall someone posting a solution here
> about using JRebel during development and getting the Cayenne stack to
> reload properly.
>
>
> On Wed, Oct 16, 2019 at 11:24 PM Andrew Willerding <aw...@itsurcom.com>
> wrote:
>
>> Hi,
>>
>> I have an application that dynamically loads jar files and reloads them
>> when they are changed. Unfortunately I'm have an issue getting Cayenne
>> to see the classes inside one of these dynamically loaded jar files. I
>> have some test code that looks roughly like this.
>>
>> import com.dbclientbase.Database.Account;
>> public class blah
>>
>> public testMethod(){
>>
>> Account ac = new Account(); // This object instantiates
>> without an error so it's visible to app outside of Cayenne
>>
>> ObjectContext oc = DBClientBase.getObjectContext(); // This
>> method generates the ServerRuntime and fails to get an ObjectContext to
>> work with (error below)
>>
>> }
>> }
>>
>> The error output below seems to suggest that Cayenne cannot access the
>> Account class although I can successfully instantiate a non-Cayenne
>> object. What can I do to ensure that Cayenne also has access to the
>> contents of a dynamically loaded and reloaded jar file? I have found
>> references to AdhocObjectFactory.getClassLoader() but I can't find any
>> examples on how to use it and I'm quite at a loss on how to even begin
>> use it.
>>
>> Thanks,
>>
>> Andrew
>>
>>
>> Exception==>org.apache.cayenne.configuration.server.DataDomainLoadException:
>>
>> [v.4.1.B2 May 04 2019 09:30:14] DataDomain startup failed: Invalid
>> class: com.dbclientbase.Database$Account
>> at
>>
>> org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:123)
>> at
>>
>> org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:60)
>> at
>>
>> org.apache.cayenne.di.spi.CustomProvidersProvider.get(CustomProvidersProvider.java:39)
>> at
>>
>> org.apache.cayenne.di.spi.FieldInjectingProvider.get(FieldInjectingProvider.java:43)
>> at
>>
>> org.apache.cayenne.di.spi.DefaultScopeProvider.get(DefaultScopeProvider.java:50)
>> at
>>
>> org.apache.cayenne.di.spi.DefaultInjector.getInstance(DefaultInjector.java:139)
>> at
>>
>> org.apache.cayenne.di.spi.FieldInjectingProvider.value(FieldInjectingProvider.java:103)
>> at
>>
>> org.apache.cayenne.di.spi.FieldInjectingProvider.injectMember(FieldInjectingProvider.java:68)
>> at
>>
>> org.apache.cayenne.di.spi.FieldInjectingProvider.injectMembers(FieldInjectingProvider.java:59)
>> at
>>
>> org.apache.cayenne.di.spi.FieldInjectingProvider.get(FieldInjectingProvider.java:44)
>> at
>>
>> org.apache.cayenne.di.spi.DefaultScopeProvider.get(DefaultScopeProvider.java:50)
>> at
>>
>> org.apache.cayenne.di.spi.DefaultInjector.getInstance(DefaultInjector.java:134)
>> at
>>
>> org.apache.cayenne.configuration.CayenneRuntime.newContext(CayenneRuntime.java:124)
>> at
>> com.dbclientbase.DBClientBase.getObjectContext(DBClientBase.java:100)
>> at java.base/java.lang.Thread.run(Thread.java:834)
>> Caused by: org.apache.cayenne.di.DIRuntimeException: Invalid class:
>> com.Database$Account
>> at
>>
>> org.apache.cayenne.di.spi.DefaultAdhocObjectFactory.getJavaClass(DefaultAdhocObjectFactory.java:128)
>> at org.apache.cayenne.util.Util.getJavaClass(Util.java:632)
>> at org.apache.cayenne.map.ObjEntity.getJavaClass(ObjEntity.java:265)
>> at
>>
>> org.apache.cayenne.map.EntityResolver.initCallbacks(EntityResolver.java:141)
>> at
>>
>> org.apache.cayenne.map.EntityResolver.getCallbackRegistry(EntityResolver.java:163)
>> at
>> org.apache.cayenne.access.DataDomain.addListener(DataDomain.java:791)
>> at
>> org.apache.cayenne.access.DataDomain.addSyncFilter(DataDomain.java:748)
>> at
>>
>> org.apache.cayenne.configuration.server.DataDomainProvider.createAndInitDataDomain(DataDomainProvider.java:188)
>> at
>>
>> org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:117)
>> ... 16 more
>> Caused by: java.lang.ClassNotFoundException:
>> com.dbclientbase.Database.Account
>> at
>>
>> java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
>> at
>>
>> java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
>> at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
>> at java.base/java.lang.Class.forName0(Native Method)
>> at java.base/java.lang.Class.forName(Class.java:398)
>> at
>>
>> org.apache.cayenne.di.spi.DefaultAdhocObjectFactory.getJavaClass(DefaultAdhocObjectFactory.java:93)
>> ... 24 more
>>
>>
Re: Cayenne and classpath question and help
Posted by Michael Gentry <bl...@gmail.com>.
Hi Andrew,
Are you using JRebel? I seem to recall someone posting a solution here
about using JRebel during development and getting the Cayenne stack to
reload properly.
On Wed, Oct 16, 2019 at 11:24 PM Andrew Willerding <aw...@itsurcom.com>
wrote:
> Hi,
>
> I have an application that dynamically loads jar files and reloads them
> when they are changed. Unfortunately I'm have an issue getting Cayenne
> to see the classes inside one of these dynamically loaded jar files. I
> have some test code that looks roughly like this.
>
> import com.dbclientbase.Database.Account;
> public class blah
>
> public testMethod(){
>
> Account ac = new Account(); // This object instantiates
> without an error so it's visible to app outside of Cayenne
>
> ObjectContext oc = DBClientBase.getObjectContext(); // This
> method generates the ServerRuntime and fails to get an ObjectContext to
> work with (error below)
>
> }
> }
>
> The error output below seems to suggest that Cayenne cannot access the
> Account class although I can successfully instantiate a non-Cayenne
> object. What can I do to ensure that Cayenne also has access to the
> contents of a dynamically loaded and reloaded jar file? I have found
> references to AdhocObjectFactory.getClassLoader() but I can't find any
> examples on how to use it and I'm quite at a loss on how to even begin
> use it.
>
> Thanks,
>
> Andrew
>
>
> Exception==>org.apache.cayenne.configuration.server.DataDomainLoadException:
>
> [v.4.1.B2 May 04 2019 09:30:14] DataDomain startup failed: Invalid
> class: com.dbclientbase.Database$Account
> at
>
> org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:123)
> at
>
> org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:60)
> at
>
> org.apache.cayenne.di.spi.CustomProvidersProvider.get(CustomProvidersProvider.java:39)
> at
>
> org.apache.cayenne.di.spi.FieldInjectingProvider.get(FieldInjectingProvider.java:43)
> at
>
> org.apache.cayenne.di.spi.DefaultScopeProvider.get(DefaultScopeProvider.java:50)
> at
>
> org.apache.cayenne.di.spi.DefaultInjector.getInstance(DefaultInjector.java:139)
> at
>
> org.apache.cayenne.di.spi.FieldInjectingProvider.value(FieldInjectingProvider.java:103)
> at
>
> org.apache.cayenne.di.spi.FieldInjectingProvider.injectMember(FieldInjectingProvider.java:68)
> at
>
> org.apache.cayenne.di.spi.FieldInjectingProvider.injectMembers(FieldInjectingProvider.java:59)
> at
>
> org.apache.cayenne.di.spi.FieldInjectingProvider.get(FieldInjectingProvider.java:44)
> at
>
> org.apache.cayenne.di.spi.DefaultScopeProvider.get(DefaultScopeProvider.java:50)
> at
>
> org.apache.cayenne.di.spi.DefaultInjector.getInstance(DefaultInjector.java:134)
> at
>
> org.apache.cayenne.configuration.CayenneRuntime.newContext(CayenneRuntime.java:124)
> at
> com.dbclientbase.DBClientBase.getObjectContext(DBClientBase.java:100)
> at java.base/java.lang.Thread.run(Thread.java:834)
> Caused by: org.apache.cayenne.di.DIRuntimeException: Invalid class:
> com.Database$Account
> at
>
> org.apache.cayenne.di.spi.DefaultAdhocObjectFactory.getJavaClass(DefaultAdhocObjectFactory.java:128)
> at org.apache.cayenne.util.Util.getJavaClass(Util.java:632)
> at org.apache.cayenne.map.ObjEntity.getJavaClass(ObjEntity.java:265)
> at
>
> org.apache.cayenne.map.EntityResolver.initCallbacks(EntityResolver.java:141)
> at
>
> org.apache.cayenne.map.EntityResolver.getCallbackRegistry(EntityResolver.java:163)
> at
> org.apache.cayenne.access.DataDomain.addListener(DataDomain.java:791)
> at
> org.apache.cayenne.access.DataDomain.addSyncFilter(DataDomain.java:748)
> at
>
> org.apache.cayenne.configuration.server.DataDomainProvider.createAndInitDataDomain(DataDomainProvider.java:188)
> at
>
> org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:117)
> ... 16 more
> Caused by: java.lang.ClassNotFoundException:
> com.dbclientbase.Database.Account
> at
>
> java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
> at
>
> java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
> at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
> at java.base/java.lang.Class.forName0(Native Method)
> at java.base/java.lang.Class.forName(Class.java:398)
> at
>
> org.apache.cayenne.di.spi.DefaultAdhocObjectFactory.getJavaClass(DefaultAdhocObjectFactory.java:93)
> ... 24 more
>
>
Re: Cayenne and classpath question and help
Posted by Andrus Adamchik <an...@objectstyle.org>.
I suspect reloaded classes come through their own ClassLoader. So what mechanism are you using for dynamic reloading and what is the structure of class loaders?
You can control CL behavior via ClassLoaderManager which is an injectable service in Cayenne. By default it is implemented via DefaultClassLoaderManager, that looks up a CL like this:
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader == null) {
classLoader = DefaultClassLoaderManager.class.getClassLoader();
}
If you can figure out CLs structure in your app, you can either implement your own ClassLoaderManager, or set a proper thread class loader.
Andrus
> On Oct 16, 2019, at 11:24 PM, Andrew Willerding <aw...@itsurcom.com> wrote:
>
> Hi,
>
> I have an application that dynamically loads jar files and reloads them when they are changed. Unfortunately I'm have an issue getting Cayenne to see the classes inside one of these dynamically loaded jar files. I have some test code that looks roughly like this.
>
> import com.dbclientbase.Database.Account;
> public class blah
>
> public testMethod(){
>
> Account ac = new Account(); // This object instantiates without an error so it's visible to app outside of Cayenne
>
> ObjectContext oc = DBClientBase.getObjectContext(); // This method generates the ServerRuntime and fails to get an ObjectContext to work with (error below)
>
> }
> }
>
> The error output below seems to suggest that Cayenne cannot access the Account class although I can successfully instantiate a non-Cayenne object. What can I do to ensure that Cayenne also has access to the contents of a dynamically loaded and reloaded jar file? I have found references to AdhocObjectFactory.getClassLoader() but I can't find any examples on how to use it and I'm quite at a loss on how to even begin use it.
>
> Thanks,
>
> Andrew
>
>
> Exception==>org.apache.cayenne.configuration.server.DataDomainLoadException: [v.4.1.B2 May 04 2019 09:30:14] DataDomain startup failed: Invalid class: com.dbclientbase.Database$Account
> at org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:123)
> at org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:60)
> at org.apache.cayenne.di.spi.CustomProvidersProvider.get(CustomProvidersProvider.java:39)
> at org.apache.cayenne.di.spi.FieldInjectingProvider.get(FieldInjectingProvider.java:43)
> at org.apache.cayenne.di.spi.DefaultScopeProvider.get(DefaultScopeProvider.java:50)
> at org.apache.cayenne.di.spi.DefaultInjector.getInstance(DefaultInjector.java:139)
> at org.apache.cayenne.di.spi.FieldInjectingProvider.value(FieldInjectingProvider.java:103)
> at org.apache.cayenne.di.spi.FieldInjectingProvider.injectMember(FieldInjectingProvider.java:68)
> at org.apache.cayenne.di.spi.FieldInjectingProvider.injectMembers(FieldInjectingProvider.java:59)
> at org.apache.cayenne.di.spi.FieldInjectingProvider.get(FieldInjectingProvider.java:44)
> at org.apache.cayenne.di.spi.DefaultScopeProvider.get(DefaultScopeProvider.java:50)
> at org.apache.cayenne.di.spi.DefaultInjector.getInstance(DefaultInjector.java:134)
> at org.apache.cayenne.configuration.CayenneRuntime.newContext(CayenneRuntime.java:124)
> at com.dbclientbase.DBClientBase.getObjectContext(DBClientBase.java:100)
> at java.base/java.lang.Thread.run(Thread.java:834)
> Caused by: org.apache.cayenne.di.DIRuntimeException: Invalid class: com.Database$Account
> at org.apache.cayenne.di.spi.DefaultAdhocObjectFactory.getJavaClass(DefaultAdhocObjectFactory.java:128)
> at org.apache.cayenne.util.Util.getJavaClass(Util.java:632)
> at org.apache.cayenne.map.ObjEntity.getJavaClass(ObjEntity.java:265)
> at org.apache.cayenne.map.EntityResolver.initCallbacks(EntityResolver.java:141)
> at org.apache.cayenne.map.EntityResolver.getCallbackRegistry(EntityResolver.java:163)
> at org.apache.cayenne.access.DataDomain.addListener(DataDomain.java:791)
> at org.apache.cayenne.access.DataDomain.addSyncFilter(DataDomain.java:748)
> at org.apache.cayenne.configuration.server.DataDomainProvider.createAndInitDataDomain(DataDomainProvider.java:188)
> at org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:117)
> ... 16 more
> Caused by: java.lang.ClassNotFoundException: com.dbclientbase.Database.Account
> at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
> at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
> at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
> at java.base/java.lang.Class.forName0(Native Method)
> at java.base/java.lang.Class.forName(Class.java:398)
> at org.apache.cayenne.di.spi.DefaultAdhocObjectFactory.getJavaClass(DefaultAdhocObjectFactory.java:93)
> ... 24 more
>