CODEWITHSUNDEEP
javaserializationcompiler-errorsserializable
tom91136
tom91136

Reputation: 8972

cannot find symbol Serializable?

Why does this:

package com.example;

import com.example.Foo.Bar.Baz;

import java.io.Serializable; // I did import Serializable...

public class Foo implements Serializable {

    public final Bar bar;

    public Foo(Bar bar) {
        this.bar = bar == null ? new Bar(Baz.ONE) : bar;
    }

    public static class Bar implements Serializable { // this is line 15, where the compiler error is pointing 

        public enum Baz {
            ONE
        }

        public final Baz baz;

        public Bar(Baz baz) {
            this.baz = baz;
        }
    }

}

Give me this:

[ERROR] <path to file>/Foo.java:[15,44] cannot find symbol
[ERROR] symbol:   class Serializable
[ERROR] location: class com.example.Foo

If I replace the Serializable interface to something else like :

public interface MyMarkerInterface {}

then the code compiles. (even Cloneable works!)

What makes this happen? intelliJ didn't spot anything wrong through static analysis.

Upvotes: 3

Views: 10618

Answers (2)

tremendous7
tremendous7

Reputation: 776

in java7 and java8 compiling depended on order of imports. your code works in java >= 9. see https://bugs.openjdk.java.net/browse/JDK-8066856 and https://bugs.openjdk.java.net/browse/JDK-7101822

to make it compile in java7 and java8 just reorder the imports

Upvotes: 0

Elliott Frisch
Elliott Frisch

Reputation: 201497

Don't try and import the internal class. That's causing your compiler error

// import com.example.Foo.Bar.Baz;
import java.io.Serializable;

public class Foo implements Serializable {
    public final Bar bar;

    public Foo(Bar bar) {
        this.bar = bar == null ? new Bar(Bar.Baz.ONE) : bar;
    }

    public static class Bar implements Serializable {
        public enum Baz {
            ONE
        }
        public final Baz baz;
        public Bar(Baz baz) {
            this.baz = baz;
        }
    }
}

Upvotes: 9

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