In java(1.6 or earlier) , are there any type of objects that are not subject to garbage collection?
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In java(1.6 or earlier) , are there any type of objects that are not subject to garbage collection?
All java objects are subject to garbage collection. However native resources are not directly managed by the garbage collector, some like window handles (JFrame) are freed by the garbage collector when a finalize() method is implemented others need manual resource management.
Also the jvm does not have to collect existing objects before it shuts down, this can cause subtle bugs like data not being flushed to disk.
Last there are extensions to the java spec for real time systems or smart cards which include unmanaged memory for performance and resource reasons. However this does not apply to the standard jvm.