Dear all, first thing to note is the serialVersionUID of a class implementing Interface Serializable is not in question. What if we create a class that for example extends HttpServlet? It also should have a serialVersionUID. If someone knows that this object will never be serialized should he define it or add an annotation to suppress t...
When I get a java.io.InvalidClassException, it gives me the serialVersionUID that it wants, and the serialVersionUID that it got. Is there an easy way to tell which of my dozens of jars using the wrong serialVersionUID? Update: I should mention that our intention is to update everything at the same time, but I'm trying to debug a probl...
Eclipse always warn me about serialVersionUID. What is this and is this a matter of high importance? Is there any example where missing serialVersionUID will cause a problem? ...
I am probably risking some downvotes on this. It seems to me that explicitly specifying serialVersionUID for new classes is bad. Consider the two cases of not changing it when layout has it should have been changed and changing it when it should not have. Not changing when it should have been changed occurs almost only when it is expl...
A few months back I serialized a java.io.Serializable object into a file. Now I need to read the contents, but since then the serialVersionUID has changed, and now I'm getting a "class incompatible" error. I know for a fact that none of the data members have changed, so the only barrier is the serialVersionUID check. Is there a way to...
My client has an oracle data base and an object was persisted as a blob field via objOutStream.writeObject, the object now has a different serialVersionUID (even though the object has no change, maybe different jvm version) and when they try to de-serialize an exception is thrown: java.io.InvalidClassException: CommissionResult; local c...
When class implements Serializable in eclipse i have two options: add default serialVersionUID(1L) or generated serialVersionUID(3567653491060394677L). I think that first one is cooler, but many times i saw people using the second option. is there any reason to generate long serialVersionUID? ...
In java, if a class implements Serializable but is abstract, should it have a serialVersionUID long declared, or do the subclasses only require that? In this case it is indeed the intention that all the sub classes deal with serialization as the purpose of the type is to be used in RMI calls. ...
Hi All, If I have a class like this: public class Name implements Serializable { private final String firstName; private final String lastName; public Name(String firstName, String lastName) { this.firstName = firstName; this.lastName = lastName; } public String getFirstName() { return first...
Is there a way to determine the generated serialVersionUID of a serialized Java object? The problem is that I serialized an object without explicitely specifying the serialVersionUID. Now the deserialization process complains about class incompatibilities. However I didn't change the class in a way which would make it incompatible. So I...
I would like to remove some warnings for some classes by generating an automatic serial version ID. In Eclipse, this is trivial to do - the IDE can generate one automatically and add it to the class. However, I don't see this functionality in NetBeans. Is it available? If so, where is it? If not, is there a plugin that can enable it? ...
Consider the following Java exception classes: public class FooException extends RuntimeException { // [...] } public class FooException extends BarException { private static final long serialVersionUID = -5322002268075295537L; // [...] } If I wish to update the inheritance hierarchy to remove BarException, such that Foo...
Hi, Eclipse nicely generates the serialVersionUID for me. But this seems to be passive code generation as the id won't be automatically updated as I change the file unless I do the generation again. Is there some way to have the serialVersionUID being generated every time I change the contents? The "Save Actions" don't seem to include...
Is there a maven plugin which automatically calculates and updates serial version uid for all java class files implementing the Serializable interface? ...
I have to work with a large number of compiled Java classes which didn't specify explicitly specify a serialVersionUID. Because their UIDs were arbitrarily generated by the compiler, many of the classes which need to be serialized and deserialized end up causing exceptions, even though the actual class definitions match up. (This is all ...
I have asked a question in : reflect a list object I actually got my answer just want to understand why when do this I will hits illegalArgumentException : Can not set static final ArrayList SerialVersionUID to java.lang.long. But when I do one object reflect to another object no error. List<ClassB> listB = (List<ClassB>) convert(listA...
I have the warning message given in the title. I would like to understand and remove it. I found already some answers on this question but I do not understand these answers because of an overload with technical terms. Is it possible to explain this issue with simple words? P.S. I know what OOP is. I know what is object, class, method, f...
I am working on a project where we have a large number of objects being serialized and stored to disk using pickle/cPickle. As the life of the project progresses (after release to customers in the field) it is likely that future features/fixes will require us to change the signature of some of our persisted objects. This could be the a...
My understanding is serialVersionUID is applicable only to classes, because we can create an object only to classes and the concept of serialVersionUID is for object serialization and deserialization. ...