That means "missing annotation of compatibility?
Hello
I'm in JDeveloper 11 g release 1. Once I created a Java class that implements java.io.Serializable and declares the serialVersionUID (with a value of 1, for example) in accordance with the documentation for Java SE, the JDeveloper IDE highlights the variable serialVersionUID with a warning that says: "compatibility annotation missing serialVersionUID = 1." What is the meaning of this warning? I've dug into the web but haven't found a discussion anywhere. To eliminate the warning, I right-click on the variable serialVersionUID in the Java Editor, click Code help, and then click Add Annotation. JDeveloper and then above declaration of the variable with "@SuppressWarnings("compatibility:<seemingly random integer value>")", where "apparently random integer value of <>" is a seemingly random integer value generated by JDeveloper. I saw the remains of this annotation on the web and the recommendations for using it, but I have not seen an explanation of what it is or why it is necessary. I also checked the Oracle's Support site and found nothing.
Can someone JDeveloper team or otherwise, please explain this weird behavior in the IDE?
Thank you
effdj
the JDeveloper IDE highlights the variable serialVersionUID with a warning that says: "compatibility annotation missing serialVersionUID = 1." What is the meaning of this warning?
Here is the description of this audit rule(Tools->Preferences->Audit->...)
"JDeveloper will attempt to detect changes that may affect the compatibility of serialization with older versions of a serializable class. A warning is issued if such a change is detected. Change detection algorithm is sensitive to changes in regards to the fields, the implemented interfaces and superclasses. »
where "
" is a seemingly random integer value generated by JDeveloper.
It is not random, but the calculated value.
I saw the remains of this annotation on the web and the recommendations for using it, but I have not seen an explanation of what it is or why it is necessary.
So in summary, if you change the class, there is no guarantee that serialized data(if exists) cannot be deserialized to this new version of the class, so IDE will try to warn you if you make a change that can break the serialization.
So, for example, if you have @SuppressWarnings("compatibility:1332443657687856"), and then you add a variable to your class, IDE will calculate the new value, and warn that there may be a compatibility problem between already serialized data and new version of the class. But if assign you this new "transitional" field, then it will not break compatibility.
Dario
Tags: Java
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