Ultimate Guide about my best practices organizing Code Style in Java project.

You can jump straight to conclusion with practical recommendations.

Prequel

Let’s start with simple definition of what Code Style is.

A Code Style contains general rules about “how to write” code, e.g. how many spaces to indent, the maximal line length, etc. A lot of minor things. When all members of a team use the same Code Style, the code looks uniform, regardless of which team member wrote it.

Each language has its own set of rules that unify how the information presents, same things apply to programming language in this case.

Do we really need some Code Style? Just because our code will be fancy?

What is a problem?

Let’s image we don’t have any Code Style in our project and multiple people are working on it. Using Git as VCS or any other VCS, we’re definitely using some VCS, if not then go to google and search why you Have to use VCS.

Conflict

First thing that will occur to you is Pull Request / Merge Request.

Someone just wanted to add 1 line of code and reformatted in process whole Java class just how he used. Imagine someone who do the same in 52 different files. Imagine that multiple people do the same parallel, you have merge conflicts, unmanageable code review, unmanageable git history, etc…

Pull Request Problem

When all developers use one code style, no merge conflicts occur on style mismatch.

Readability

When multiple developers work on same projects, they mostly Reading code, other than Writing code. Keeping that in mind, it is easy for developers to read code that utilize same patterns. Our mind is always looking for pattern and constantly matching such patterns from our experience.

When one class method parameters are chaotic, in other they can be one lined, other class on each line, this interrupt developer when he is reading the code.

When particular code pattern looks same across all codebase, it makes mind trigger and recognise such patterns, thus read and understand code faster.

Automation

Agreeing using one code style for whole project is great, but when developers have to keep in mind all rules about how to write code that is unmanageable. This means that there should be some tool that will know all rules across one or many projects and can be automatically validate code against such rules.

Code Style tool must be user-friendly to use inside IDE by developer.

Code Style Standards

This is a good practice to research and utilize already existing solutions for your particular problem. Always keep in mind that such solutions must be robust, well executed and properly tested (with time or some tests)

When we are talking about code style, that is a good thing to utilize already existing Code Style cause many developers are already familiar with it.

Google Code Style

Google is a huge company that heavily utilizes Java and of course has its own Code Style.

Here is full documentation about Google Code Style.

Sun\Oracle Code Style

When Oracle acquired SunMicrosystems, Sun Code Style was also on board.

Here is full documentation about Sun\Oracle Code Style.

Google vs Oracle?

Good question, Oracle Code Style is a solid choice but not that widely used in most tools (partially in some) and sometimes not that strict. Also is quite outdated (1997), when a lot of new syntax constructions were introduced to Java.

Google Code Style in my opinion is just evil and just unreadable.

Here just few examples from me:

Show Code Style for Controller

Most common one is simple controller that is implemented via Micronaut, Quarkus, Spring, etc for Sun\Oracle Code Style: Sun/Oracle Code Style Controller

And here is Google Code Style Hell: Google Evil Code Style Controller

Show Code Style for Method

Here is simple method with some loops and ifs for Sun\Oracle Code Style: Sun/Oracle Code Style Method

And here is Google Code Style Hell: Google Evil Code Style Method

Everything becomes too compact, 2 spaces instead of 4, return one liner and other stuff in complex code become unreadable and difficulty distinguishable in my opinion.

Java sometimes (maybe most times) become verbose when we are talking about syntax, but in my opinion this is a benefit for Java as a language. Always prefer good readability than some great-complex-overengineered one-liner.

Code is mostly read by other developers who will thank you for making it easier to read and understand such code. Machine doesn’t care is that a one liner or same code on 5 lines, same machine code in the end (most time).

Instruments

Automation is key feature that should be in your tool chain for proper Code Style management in project.

Here is list of best\widely used tools for Code Style management (maybe there is something better I didn’t hear about it, please let me know then).

IntelliJ IDEA / Eclipse

Maybe one of the most used one, your IDE. We are talking of course about IntelliJ IDEA and sometimes Eclipse (I will focus on IDEA as my only IDE for JVM environment).

Here is documentation about default IDEA Java Code Style.

Pros:

Great integration for developer (no further installation, no external tools required already in IDE, Easy to use)
Great custom Code Style configuration (UI code style editor)
Code Style apply

Cons:

No Code Style check, only Code Style apply feature (developer must manually remember apply or problems) (not touching Gradle\Maven plugins here)
Manual Code Style apply (Developer must manually apply or problems)
Poor CI integration (Can’t be used outside IDE, like in CI)
IDE vendor lock
Difficult to propagate and synchronize Code Style between developers

Google Java Format

As previously mentioned, Google Code Style just as a set of rules is unreadable so that’s a no-go for me just for this reason.

But still, lets review this Google Code Style tool:

Pros:

Great integration for developer (have IDE plugins, here is list of integrations)
Great CI integration (have GitHub action, CMD tool, IDE plugins, Gradle\Maven plugins, here is list of integrations)
Code Style apply

Cons:

Only Google Code Style
No Code Style check, only Code Style apply feature (developer must manually remember apply or problems) (not touching 3rd party Gradle\Maven tools)
Manual Code Style apply (Developer must manually apply or problems) (There are some git-hook integrations that commit your source code with code style format, but that’s like another circle of hell, not an option)
Poor custom Code Style configuration

Checkstyle

Quite popular and widely used tool, have a lot of standard configurations, different Code Style support and ton of great features.

Have a lot of precise and interesting check rules and great ability to write and integrate your own custom set of rules.

Checkstyle Example

Checkstyle is more than just tool for checking Code Style, this is powerful tool that can allow you to restrict specific language constructions, patterns, some custom syntax/class/dependency usage in code base.

Checkstyle have great integration in IntelliJ IDEA with inspections and highlight in IDE.

Checkstyle Highlight

Support both Sun\Oracle Code Style and Google Code Style.

Pros:

Great integration for developer (Gradle\Maven plugin, IDEA Plugin and inspections)
Great CI integration (Gradle\Maven plugin)
Good configuration for tons of different rules
Great rules customization (write your own custom rules or use ton of existing ones)
Code Style check

Cons:

Poor custom Code Style configuration (this relates only to Code Style)
No Code Style apply, only Code Style check (developer have to manually fix issues)

Spotless

Cherry on top, Spotless.

This is really powerful tool that is specifically build to manage Code Style.

Allow both check Code Style in project and apply Code Style to automatically fix all code style issues.

Spotless can utilize Eclipse IDE for great custom Code Style configuration, this is really great when you would like to tune your Code Style a bit, like increase maximum line length (cause typical monitor size and pixel density increased a lot from 2001), etc.

Eclipse Code Style Editor

Spotless also support a lot of other interesting features and integrations, with different tools like licence header generation, etc. Spotless is quite intuitive and easy to use, just setup it and then two simple Gradle tasks will do all the magic:

Check code against Code Style rules for whole project:

./gradlew spotlessCheck

Apply Code Style rules for whole project:

./gradlew spotlessApply

Pros:

Great integration for developer (Gradle\Maven plugin, IDEA Eclipse Plugin)
Great CI integration (Gradle\Maven plugin)
Great custom Code Style configuration (via Eclipse format integration)
Code Style check
Code Style apply
Support Sun\Oracle Code Style (Eclipse format), Google Code Style, customizable Code Style (Eclipse format).
Support not only Java, but Kotlin, Scala, Groovy and a lot of other things

In my opinion Spotless is the best tool for Code Style management and don’t have major cons. But there is always room to growth for custom configuration for Eclipse Code Style editor or Spotless.

Here is Spotless configuration for Gradle I configured and use myself.

Don’t forget add this properties for Java16+ support.

IntelliJ IDEA Eclipse Plugin

There is integration for Eclipse Code Style format with IntelliJ IDEA via plugin.

Automatic Code Style apply can be configured to default IntelliJ IDEA shortcuts

The Devil is in the Details

Great we choose any tool we like, choose Code Style, and we are ready, aren’t we?

We aren’t. There are lots of sketchy details how to properly manage Code Style in project.

Check or Apply?

Why we even need check or apply? What’s for?

First, we need to Check code that developer trying to push is valid against Code Style rules. This should happen in CI, this is where Code Style check is applied.

Second, when developer finished his feature and ready to commit code in VCS, developer need to apply Code Style for his new portion of code, so all new Code will be automatically formatted according to Code Style rules. Developer shouldn’t manually fix all Code Style issues, there must be automation tool that does it for him.

In the end we need both, Code Style check and apply:

Code Style check for validating new code against Code Style rules in CI.
Code Style apply for automatically applying Code Style rules to new code as developer.

Java files only?

Java project most of the time have not only Java files, but actually other files. Most of them are .yaml, .properties and .xml files. At a first look, we don’t give a… but we do.

What can we do about them? Not so much, but what we definitely can do:

Indent to use (space or tab?)
Indent size (1, 2 or 4?)
Charset

These are things that can introduce style conflicts in such files and the solution for this is widely spread EditorConfig.

EditorConfig is simple open format for abstract IDE with basic text style properties. Is supported in many IDE including IDEA and Eclipse. This can be applied for all projects, not only Java based project.

Here .editorconfig I configured and use myself.

Windows and Unix friends or foe?

Different members of your team probably are working from different OS. And when we are talking about text files different OS have different ways to handle line separation. When we are talking about Windows this is CRLF and Unix this is LF.

Most tools are working with LF, also git’s default behaviour is LF, so when someone on Windows changes file it may automatically convert all LF -> CRLF and then there will be unnecessary changes or conflicts.

Best way to handle this is to use .gitattributes file which integrates in git and Spotless. This will allow us to manage line separator when applying Code Style via Spotless.

Here .gitattributes config I configured and use myself.

Custom Sun Code Style

As previous mentioned Sun/Oracle Code Style is a bit outdated in my opinion (max symbols per line, etc.) and not that strict some times.

So I used Eclipse IDE and tuned it a bit:

Increased max symbols for code (130)
Increased max symbols for comment (100)
Force wrap all constructor/method arguments if any of them is on new line
Improved comment section wrapping
Ternary operator force split on lines
And probably something else…

All those tunes were made to improve readability, code base consistency and remove multiple Code Style interpretations for same Code sections.

Here Spotless Eclipse JDT Config I configured and use myself, just place it in project root under codestyle.xml name.

Conclusion

Manage style for files like .yaml, .properties and .xml files in project using .editorconfig

Show .editorconfig config

Here is link to .editorconfig I configured and use myself.

# EditorConfig is awesome: http://EditorConfig.org

# top-most EditorConfig file
root = true

# all-encompassing default settings unless otherwise specified
[*]
end_of_line = lf
charset = utf-8

# Json
[*.json]
indent_size = 2
indent_style = space
insert_final_newline = false
trim_trailing_whitespace = true

# Yaml
[{*.yml, *.yaml}]
indent_size = 2
indent_style = space
insert_final_newline = true
trim_trailing_whitespace = true

# Property files
[*.properties]
indent_size = 2
indent_style = space
insert_final_newline = true
trim_trailing_whitespace = true

# XML files
[*.xml]
indent_size = 4
indent_style = space
insert_final_newline = true
trim_trailing_whitespace = true

Manage line separator via .gitattributes for all text files, cause some developers use Windows (CRLF) and Unix like systems (LF).

Show .gitattributes config

Here is link to .gitattributes I configured and use myself.

# Handle line endings automatically for files detected as text
# and leave all files detected as binary untouched.
*               text=auto


# The above will handle all files NOT found below
# These files are text and should be normalized (Convert crlf => lf)
*.bash          text eol=lf
*.css           text diff=css
*.df            text
*.htm           text diff=html
*.html          text diff=html eol=lf
*.java          text diff=java eol=lf
*.js            text
*.json          text eol=lf
*.jsp           text eol=lf
*.jspf          text eol=lf
*.jspx          text eol=lf
*.properties    text eol=lf
*.sh            text eol=lf
*.tld           text
*.txt           text eol=lf
*.tag           text
*.tagx          text
*.xml           text
*.yml           text eol=lf


# These files are binary and should be left untouched
# (binary is a macro for -text -diff)
# Archives
*.7z            binary
*.br            binary
*.gz            binary
*.tar           binary
*.zip           binary
*.jar           binary
*.so            binary
*.war           binary
*.dll           binary

# Documents
*.pdf           binary

# Images
*.ico           binary
*.gif           binary
*.jpg           binary
*.jpeg          binary
*.png           binary
*.psd           binary
*.webp          binary

# Fonts
*.woff2         binary

# Other
*.exe           binary
*.class         binary
*.ear           binary

Manage Code Style for Java project via Spotless with Eclipse JDT for this reasons

Show Spotless configuration for Gradle

Here is link to Spotless configuration for Gradle I configured and use myself.

build.gradle:

plugins {
    id "com.diffplug.spotless" version "6.1.0"
}

spotless {
    java {
        encoding("UTF-8")
        importOrder()
        removeUnusedImports()
        eclipse("4.21.0").configFile("${projectDir}/config/codestyle.xml")
    }
}

Don’t forget add properties below for Java16+ support:

org.gradle.jvmargs=-Dfile.encoding=UTF-8 \
  --add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED \
  --add-exports jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED \
  --add-exports jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED \
  --add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED \
  --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED

Use Sun\Oracle Code Style, not Google Code Style for this reasons.

Show Spotless Eclipse JDT config (save as codestyle.xml)

Here is link to Spotless Eclipse JDT Config I configured and use myself, just place it in project under codestyle.xml name.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<profiles version="21">
    <profile kind="CodeFormatterProfile" name="Anton Kurako (GoodforGod)" version="21">
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_ellipsis" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_enum_declarations" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_allocation_expression" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_for_statment" value="common_lines"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.new_lines_at_block_boundaries" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_constructor_declaration_parameters" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.insert_new_line_for_parameter" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_package" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_enum_constant" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_while" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_annotation_type_member_declaration" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.format_javadoc_comments" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.indentation.size" value="1"/>
        <setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_enum_constant_declaration" value="common_lines"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_semicolon_in_for" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.align_with_spaces" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.continuation_indentation" value="2"/>
        <setting id="org.eclipse.jdt.core.formatter.number_of_blank_lines_before_code_block" value="0"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_switch_case_expressions" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.blank_lines_after_package" value="1"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_multiple_local_declarations" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_enum_constant" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_angle_bracket_in_parameterized_type_reference" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.indent_root_tags" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.wrap_before_or_operator_multicatch" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.enabling_tag" value="@formatter:on"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.count_line_length_from_starting_position" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_record_components" value="82"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_throws_clause_in_method_declaration" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_parameter" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.wrap_before_multiplicative_operator" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.keep_then_statement_on_same_line" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_explicitconstructorcall_arguments" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_prefix_operator" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_brace_in_array_initializer" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_angle_bracket_in_type_arguments" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_method" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_parameterized_type_references" value="0"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_logical_operator" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_parenthesized_expression" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.keep_annotation_declaration_on_one_line" value="one_line_if_empty"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_record_declaration" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_enum_constant" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_multiplicative_operator" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_and_in_type_parameter" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_invocation" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_assignment_operator" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_type_declaration" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_for" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.preserve_white_space_between_code_and_line_comments" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_after_annotation_on_local_variable" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_abstract_method" value="1"/>
        <setting id="org.eclipse.jdt.core.formatter.keep_enum_constant_declaration_on_one_line" value="one_line_if_empty"/>
        <setting id="org.eclipse.jdt.core.formatter.align_variable_declarations_on_columns" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_method_invocation" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_union_type_in_multicatch" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_method_body" value="-1"/>
        <setting id="org.eclipse.jdt.core.formatter.keep_else_statement_on_same_line" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_catch_clause" value="common_lines"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_parameterized_type_reference" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_array_initializer" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_annotation" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_explicit_constructor_call" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_multiplicative_operator" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.keep_anonymous_type_declaration_on_one_line" value="one_line_if_single_item"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_switch_case_expressions" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.wrap_before_shift_operator" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_annotation_declaration_header" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.brace_position_for_block" value="end_of_line"/>
        <setting id="org.eclipse.jdt.core.formatter.number_of_blank_lines_at_end_of_code_block" value="-1"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_bitwise_operator" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.put_empty_statement_on_new_line" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_parameters_in_constructor_declaration" value="82"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_type_parameters" value="0"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_compact_loops" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.clear_blank_lines_in_block_comment" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.keep_simple_for_body_on_same_line" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_at_end_of_file_if_missing" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_array_initializer" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_unary_operator" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.format_line_comment_starting_on_first_column" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_annotation" value="common_lines"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_ellipsis" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_semicolon_in_try_resources" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_colon_in_assert" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_annotations_on_enum_constant" value="49"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_and_in_type_parameter" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_parenthesized_expression" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.text_block_indentation" value="0"/>
        <setting id="org.eclipse.jdt.core.formatter.align_type_members_on_columns" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_assignment" value="0"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_module_statements" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_type_header" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_declaration" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.align_tags_names_descriptions" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_enum_constant" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.keep_if_then_body_block_on_one_line" value="one_line_never"/>
        <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_first_class_body_declaration" value="1"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_before_closing_brace_in_array_initializer" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_constructor_declaration_parameters" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.format_guardian_clause_on_one_line" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_if" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.align_assignment_statements_on_columns" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.brace_position_for_block_in_case" value="end_of_line"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_constructor_declaration" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_conditional_expression_chain" value="49"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.format_header" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_type_annotations" value="80"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_allocation_expression" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.wrap_before_assertion_message_operator" value="true"/>
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        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_bracket_in_array_allocation_expression" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_constructor_declaration" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_angle_bracket_in_parameterized_type_reference" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_angle_bracket_in_type_arguments" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_assert" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_member_type" value="1"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_logical_operator" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_qualified_allocation_expression" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_superinterfaces_in_record_declaration" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_if" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_semicolon" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.wrap_before_relational_operator" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_postfix_operator" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_angle_bracket_in_type_arguments" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_cast" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.format_block_comments" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_parameters_in_method_declaration" value="82"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_method_declaration_throws" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.blank_lines_after_last_class_body_declaration" value="-1"/>
        <setting id="org.eclipse.jdt.core.formatter.indent_statements_compare_to_body" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.keep_simple_while_body_on_same_line" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.wrap_before_logical_operator" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.blank_lines_between_statement_group_in_switch" value="0"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_bracket_in_array_reference" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_annotation" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_enum_constant_arguments" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.parentheses_positions_in_lambda_declaration" value="common_lines"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_case" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_bracket_in_array_reference" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.keep_enum_declaration_on_one_line" value="one_line_if_empty"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_method_declaration" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.brace_position_for_enum_constant" value="end_of_line"/>
        <setting id="org.eclipse.jdt.core.formatter.brace_position_for_type_declaration" value="end_of_line"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_multiplicative_operator" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.blank_lines_before_package" value="-1"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_for" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_for_increments" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_enum_constant" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_explicitconstructorcall_arguments" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_annotation" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.indent_body_declarations_compare_to_enum_constant_header" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_constructor_declaration" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_constructor_declaration_throws" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_angle_bracket_in_type_parameters" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_question_in_conditional" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.indent_parameter_description" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_code_block" value="-1"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_new_line_before_finally_in_try_statement" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.tabulation.char" value="space"/>
        <setting id="org.eclipse.jdt.core.formatter.wrap_before_string_concatenation" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.lineSplit" value="130"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_annotation" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_switch" value="insert"/>
    </profile>
</profiles>

Don’t forget to add .gitignore to your project, that’s not about Code Style but still import thing.

Show .gitignore config

Here is link to .gitignore config for Gradle I configured and use myself.

### Package Files
*.war
*.nar
*.ear
*.zip
*.tar.gz
*.rar

### Gradle template
.gradle
build/
target/

### Idea generated files
.idea
.settings/
*.iml
out/

In case you want to reinforce some rules or write your own custom Code Style rules, take a look at CheckStyle.

If you want ready to go project template, you can check my Java Template on GitHub.

Prequel#

What is a problem?#

Conflict#

Readability#

Automation#

Code Style Standards#

Google Code Style#

Sun\Oracle Code Style#

Google vs Oracle?#

Instruments#

IntelliJ IDEA / Eclipse#

Google Java Format#

Checkstyle#

Spotless#

IntelliJ IDEA Eclipse Plugin#

The Devil is in the Details#

Check or Apply?#

Java files only?#

Windows and Unix friends or foe?#

Custom Sun Code Style#

Conclusion#

Prequel

What is a problem?

Conflict

Readability

Automation

Code Style Standards

Google Code Style

Sun\Oracle Code Style

Google vs Oracle?

Instruments

IntelliJ IDEA / Eclipse

Google Java Format

Checkstyle

Spotless

IntelliJ IDEA Eclipse Plugin

The Devil is in the Details

Check or Apply?

Java files only?

Windows and Unix friends or foe?

Custom Sun Code Style

Conclusion