java.lang.reflect.InaccessibleObjectException: Unable to make field private transient java.lang.Object java.lang.Throwable.backtrace accessible: module java.base does not “opens java.lang” to unnamed module @76628072

Explanation of the problem

It seems that the task ktlintFormat has failed due to an ExceptionInInitializerError caused by a java.lang.NullPointerException.

The error message suggests that the issue occurred while trying to remove children from a composite element, specifically in the ImportOrderingRule.visit function. The error may be related to a problem with the syntax tree, potentially caused by an incorrect implementation of the rule.

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Problem solution for java.lang.reflect.InaccessibleObjectException: Unable to make field private transient java.lang.Object java.lang.Throwable.backtrace accessible: module java.base does not “opens java.lang” to unnamed module @76628072

Problem: KtLint not formatting code correctly

This issue usually occurs when KtLint is not configured to use the desired formatting rules or when the formatting rules themselves are incorrect.

Solution:

One solution is to create a ktlintrc file at the root of the project to define the formatting rules. Here is an example of a ktlintrc file that defines the maximum line length as 100 and the indentation as 4 spaces:

max_line_length=100
indent_size=4

Problem: KtLint not finding certain rules or plugins

This issue can occur when KtLint is not able to find certain rules or plugins that are required for the project.

Solution:

One solution is to add the missing rules or plugins to the build.gradle file:

dependencies {
    ktlint "com.pinterest:ktlint:<version>"
    ktlintRuleset "com.github.<username>:<repository>:<tag>"
    ktlintPlugin "com.github.<username>:<repository>:<tag>"
}

Here, the ktlintRuleset and ktlintPlugin dependencies are added to provide the missing rules or plugins. Replace <username>, <repository>, and <tag> with the appropriate values for the missing dependency.

Problem: KtLint not working with newer versions of Java

This issue can occur when KtLint is not able to access certain libraries due to newer versions of Java restricting access to those libraries.

Solution:

One solution is to add the --add-opens JVM argument to the KtLint task to allow access to the required libraries. Here is an example:

task ktlint(type: JavaExec) {
    classpath = configurations.ktlint
    main = "com.pinterest.ktlint.Main"
    jvmArgs = ["--add-opens=java.base/java.lang=ALL-UNNAMED"]
    args = ["src/**/*.kt"]
}

A brief introduction to KtLint

Most popular use cases for KtLint

Ktlint is a static code analysis tool for Kotlin that is designed to enforce a consistent coding style and identify potential errors and bugs. It can be used to ensure code quality and maintainability, as well as promote collaboration and understanding among developers. One of the primary benefits of ktlint is that it automates the process of checking code for common style and syntax issues, which can save time and reduce the likelihood of human error.

One way ktlint can be used is to ensure that code adheres to a specific set of style guidelines. This can help to make code more readable and easier to understand, as well as prevent errors that might arise from inconsistencies in formatting and naming conventions. For example, the following code block shows how ktlint can be used to check a file for style violations based on a specific configuration:

./gradlew ktlintCheck -P ktlint.config="path/to/ktlint.yml" "src/**/*.kt"