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Code Analyzer for Java

There is a newer version: 8.6.0.37351

Why is this an issue?
The readObject method is implemented when a Serializable object requires special handling to be reconstructed from a
file. The object created by readObject is accessed only by the thread that called the method, thus using the synchronized
keyword in this context is unnecessary and causes confusion.
Noncompliant code example
private synchronized void readObject(java.io.ObjectInputStream in)
     throws IOException, ClassNotFoundException { // Noncompliant
  //...
}

Compliant solution
private void readObject(java.io.ObjectInputStream in)
     throws IOException, ClassNotFoundException { // Compliant
  //...
}

Resources
Documentation

   Oracle SDK 20 - Serializable 
   Oracle SDK 20 - ObjectInputStream
  

Articles & blog posts

   Serialization in Java