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The transient keyword is a stronger condition than @Transient: If a field uses the transient keyword, that field will not be serialized when the object is converted to a byte stream. Furthermore, since JPA treats fields marked with the transient keyword as having the @Transient annotation, the field will not be persisted by JPA either. The transient keyword in Java is used to indicate that a field should not be part of the serialization (which means saved, like to a file) process.
Understanding the Context
From the Java Language Specification, Java SE 7 Edition, Section 8.3.1.3. transient Fields: Variables may be marked transient to indicate that they are not part of the persistent state of an object. For example, you may have fields that are derived ... The volatile and transient modifiers can be applied to fields of classes 1 irrespective of field type.
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Apart from that, they are unrelated. The transient modifier tells the Java object serialization subsystem to exclude the field when serializing an instance of the class. When the object is then deserialized, the field will be initialized to the default value; i.e. null for a reference type ... So when I added the Child to the Parent, then saved the Parent, Hibernate would toss the "object references an unsaved transient instance - save the transient instance before flushing" message when saving the Parent.
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Adding in the cascade = CascadeType.ALL on the Parent's reference to the Child solved the problem in both cases. What does the keyword "transient" mean in Java? [duplicate] Asked 15 years, 1 month ago Modified 2 years, 10 months ago Viewed 199k times A transient lifetime services are created each time they're requested from the service container. For example, during one request you use httpclient service to call other web api request multiple times, but the web api endpoint is different. At that time you will register the httpclient service as transient. As vezes quando vou declarar meus atributos noto o transient e o volatile.
Tenho as seguintes dúvidas O transient e volatile são modificadores de acesso? Qual a finalidade de utilizá-los? Exemplo: From the docs: Transient Transient lifetime services are created each time they're requested from the service container. This lifetime works best for lightweight, stateless services.