intellij idea - Java 11 compile error: Package xxx exists in another module

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There is a class in my project. This class in package javax.swing extends javax.swing.JOptionPane because I want to use some protected methods of JOptionPane.

When the compiler is JDK 8 it works fine. I update the JDK version to 11 then I've got a compile error: Package 'javax.swing' exists in another module: java.desktop.

My IDE is Intellij idea. I opened the Settings--Build,Execution,Deployment--Java Compiler and added an item to 'Override compiler parameters pre-module'. The Module is my project. The compilation options is

--patch-module java.desktop=src -d mypatches/java.desktop/src/java.desktop/javax/swing/Top.java
But it does not work.
My project tree is 'GreatProject/src/javax/swing/Top.java'.
What's the 'src -d' means?
What's the right '--patch-module'?
Starting from Java 9 version, full support for the jigsaw project was added to ensure the project's modularity. This system can cause problems at the compile process if the same names are present in packages.
Please, check this topic about the module patching process to adapt your module for javax.swing package.
Also, you may try to use Reflection API for getting elements from 'JOptionPane' class.
                I have seen the patch-module command in OpenJDK website. There is an example. javac --patch-module java.base=src -d mypatches/java.base \         src/java.base/java/util/concurrent/ConcurrentHashMap.java. What does the backslash do? What's the mypatches?
– S.Lee
                Feb 17, 2020 at 7:27
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