Issue with generated layered entity code - may need documentation?

[hrstoyanov]

Environment Details

• EclipseStore Version: 1.3.1
• JDK version: 21.0.2
• OS: MacOs Sonoma

Describe the bug

This is not really a bug, but rather a suggestion to add documentation.

In a fully modularized application, when the embedded storage manager attempts to persist entities, it fails with:

java.lang.reflect.InaccessibleObjectException: Unable to make protected datamodel.product._Product.ProductEntity() accessible: module datamodel does not "opens datamodel.product._Product" to module org.eclipse.serializer.persistence.binary
	at java.base/java.lang.reflect.AccessibleObject.throwInaccessibleObjectException(AccessibleObject.java:391)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:367)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:315)
	at java.base/java.lang.reflect.Constructor.checkCanSetAccessible(Constructor.java:194)
	at java.base/java.lang.reflect.Constructor.setAccessible(Constructor.java:187)
	at org.eclipse.serializer.persistence.binary@1.3.1/org.eclipse.serializer.persistence.binary.org.eclipse.serializer.entity.BinaryHandlerEntityLayerIdentity.WrapDefaultConstructor(BinaryHandlerEntityLayerIdentity.java:61)
	at org.eclipse.serializer.persistence.binary@1.3.1/org.eclipse.serializer.persistence.binary.org.eclipse.serializer.entity.BinaryHandlerEntityLayerIdentity.New(BinaryHandlerEntityLayerIdentity.java:50)
	at org.eclipse.serializer.persistence.binary@1.3.1/org.eclipse.serializer.persistence.binary.types.BinaryTypeHandlerCreator$Default.createEntityLayerIdentityHandler(BinaryTypeHandlerCreator.java:368)
	at org.eclipse.serializer.persistence.binary@1.3.1/org.eclipse.serializer.persistence.binary.types.BinaryTypeHandlerCreator$Default.internalCreateTypeHandlerEntity(BinaryTypeHandlerCreator.java:351)

Additional context

This is fixed by declaring the entity module "open" (also notice that the generated packages like _Product would need to be exported as well):

open module datamodel {
    //...
    exports datamodel.product._Product;
}