Re: Cayenne and classpath question and help

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 <[email protected]>
> 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
>>
>>