How to resolve Checkstyle error: 'method def modifier ' has incorrect indentation - intellij-idea

Question

Got a checkstyle error that states a member def modifier has incorrect indentation level 4 and is expected to be level 2.

Answer 1

Apart from having checkstyle as a plugin, you must download the its jar file as well, just because there you will be able to see what google and sun check file are doing to your code, and true to be told, it is kind of hard to understand checkstyle documentation, and having those files at hand will ease the process to understand what is going on.
Getting back to your question, there is a module called Indentation which has a property for basicOffset that is setting the space it waits to find when scanning your code, I'll show you an example:
<module name="TreeWalker">
<module name="Indentation">
<property name="basicOffset" value="2"/>
<property name="caseIndent" value="2"/>
</module>
XML content above shows a simple example, where I want to show you this module thing, that's why I added another property called caseIndent for same module called Indentation which resides inside TreeWalker. As you can see the basicOffset property has the number 2 as a value, then you could say, wait, the message I got said 4 and not 2. I'll explain it:
class Foo { // no space at the left side
private void fooMethod() { // a tab or 2 space at the left side
int a = 0; // 2 space from method's declaration plus 2 for this is 4
}
}
Definively you ought see the xml I mentioned before, replicate in your own with basic stuff and play around to have a better understanding. You can get more info form here.