49 lines
1.2 KiB
Plaintext
49 lines
1.2 KiB
Plaintext
Serializing a non-``++static++`` inner class will result in an attempt at serializing the outer class as well. If the outer class is not serializable, then serialization will fail, resulting in a runtime error.
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Making the inner class ``++static++`` (i.e. "nested") avoids this problem, therefore inner classes should be ``++static++`` if possible. However, you should be aware that there are semantic differences between an inner class and a nested one:
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* an inner class can only be instantiated within the context of an instance of the outer class.
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* a nested (``++static++``) class can be instantiated independently of the outer class.
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== Noncompliant Code Example
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----
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public class Pomegranate {
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// ...
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public class Seed implements Serializable { // Noncompliant; serialization will fail
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// ...
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}
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}
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----
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== Compliant Solution
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----
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public class Pomegranate {
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// ...
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public static class Seed implements Serializable {
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// ...
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}
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}
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----
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== See
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* https://wiki.sei.cmu.edu/confluence/x/ZTdGBQ[CERT SER05-J.] - Do not serialize instances of inner classes
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ifdef::env-github,rspecator-view[]
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'''
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== Implementation Specification
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(visible only on this page)
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include::message.adoc[]
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endif::env-github,rspecator-view[]
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