Java Error: Deserialization Error, How to Fix and Avoid

Deserialization errors in Java are one of the most common errors. When this error occurs, an error occurs when the program parses data serialization, causing the program to fail to run normally. So how to solve and avoid Java deserialization errors?

1. Reasons for deserialization errors

There are many reasons for deserialization errors, the most important ones are the following:

1. System upgrade or Change

When the system is upgraded or changed, the classes originally serialized have changed, causing deserialization to be unable to correctly parse the originally serialized classes, resulting in deserialization errors.

2. The data source changes

The data source may be data read from the network or file. If the data source changes and the deserializer cannot correctly identify the data source, then A deserialization error will occur.

3. Lack of necessary classes or libraries

During deserialization, the program may need to access some classes or libraries. If these classes or libraries are deleted or the versions are inconsistent, it will also cause Deserialization error.

2. Methods to solve deserialization errors

1. The same object must be used during serialization and deserialization

When serializing and deserializing The exact same object must be used during the deserialization operation. Using a different object type during deserialization will result in a deserialization error.

2. Add UID

Java's serialization mechanism automatically assigns a default UID to each class. To avoid UID errors, developers are recommended to specify a specific UID for custom classes.

3. Customized serialization method

If the default serialization and deserialization methods cannot meet development needs, you can customize the serialization and deserialization methods. This is more flexible and more targeted.

4. Prevent data string modification

Deserialization vulnerabilities are very similar to data string modification vulnerabilities. An attacker can cause malicious serialization or deserialization by forging malicious data. Therefore, in order to avoid the problem of data string modification, it is best to use digital signature and other technologies to enhance the integrity and security of the data.

3. Methods to avoid deserialization errors

1. Version compatibility

When modifying a class, version compatibility must be ensured. Do not modify the members of the serialized object at will, future expansion can be achieved by adding new members.

2. Use the externalizable interface with caution

Although the externalizable interface is more flexible than Serializable, developers must manually specify the sequence and deserialization methods when implementing it. Therefore, development The author must ensure the coordination and consistency between various versions.

3. Prevent malicious deserialization

Malicious deserialization is achieved by constructing specific serialized data, and then deserializing and executing specific code in the target system. For attack purposes. To avoid this problem, developers can use the Java Serial Filter interface to control deserialized classes and properties.

4. Summary

In Java, deserialization errors are a very common problem and a very troublesome problem. When developing projects, we should try our best to avoid such mistakes. If we encounter a deserialization error, we can start from aspects such as version compatibility, UID and custom serialization, and finally find a feasible solution. Of course, it is also very important to prevent deserialization vulnerabilities. Developers need to enhance the security and integrity of the program as much as possible to avoid the occurrence of deserialization vulnerabilities and other related vulnerabilities.

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