Snyk for Java and Kotlin

Snyk offers security scanning to test your projects for vulnerabilities, both through your CLI and through different integrations from our UI.
Features
The following tables provide an outline of the general features Snyk offers by language. In addition to these features, we offer additional functionality related to the specific integration configurations.
Some features might not be available, depending on your pricing plan. See pricing plans for more details.
Gradle projects imported via Git are tested by parsing build.gradle files. As the only truly reliable way to resolve Gradle dependencies is to execute the tool itself, this method can sometimes provide incomplete results.
If possible, enable lockfiles in your Gradle project to improve the accuracy for Git imports.
However, for the most accurate results, we recommend using the Snyk CLI to test Gradle projects.
Java
Kotlin
Java
Package managers / Features
CLI support
Git support
License scanning
Fix PRs
​Maven​
✔︎
✔︎
✔︎
✔︎
​Gradle​
✔︎
✔︎
✔︎
​Fix advice only
Kotlin
Package managers / Features
CLI support
Git support
License scanning
Fixing
Runtime monitoring
​Gradle​
✔︎
​
✔︎
​Fix advice only
✔︎
Supported versions
Maven
CLI - Maven 3.* (more details)
Git - Maven 3.*
Gradle
CLI - Gradle 2.*, 3.*, 4.*, 5.*, 6.*  (more details)
Git - Gradle 2.*, 3.*,4.*, 5.*, 6.*
Snyk CLI tool for Java and Kotlin projects (CI/CD)
The way Snyk analyzes and builds the dependencies varies depending on the language and package manager of the project.
Learn how to use the tool for your Java projects as follows:
Snyk CLI with Gradle: To build the dependency graph, Snyk integrates with Gradle and inspects the dependencies returned by the build. The following manifest files are supported: build.gradle and build.gradle.kts
Snyk CLI with Maven: To build the dependency tree, Snyk analyzes the output of the pom.xml files.
CLI parameters for Java and Kotlin
This section describes the unique CLI commands available when working with Java-based projects as follows:
Prerequisites
Install the relevant package manager before you use the Snyk CLI tool.
Include the relevant manifest files supported by Snyk before testing.
Install and authenticate the Snyk CLI to start analyzing projects from your local environment. See Getting started with the CLI.
Snyk CLI parameters
When working with Gradle projects from our CLI, you can add any of the following options to further refine the way the scan works:
Option
Description
--sub-project=
For Gradle "multi-project" configurations, test a specific sub-project.
--all-sub-projects
For "multi-project" configurations, test all sub-projects.
--configuration-matching=
Resolve dependencies using only configuration(s) that match the provided Java regular expression. For example: '^releaseRuntimeClasspath#x27;
--configuration-attributes=
Select certain values of configuration attributes to resolve the dependencies. For example: 'buildtype:release,usage:java-runtime'
--all-projects
Use for monorepos. This will detect all supported manifests. For Gradle monorepos Snyk will only look for root level build.gradle / build.gradle.kts files and apply the same logic as --all-sub-projects behind the scenes. This command is designed to be run in the root of your monorepo.
Pass extra arguments directly to Gradle or Maven via Snyk CLI
You can pass any extra Gradle or Maven arguments directly to gradle or mvn by providing them after a Snyk command like so:
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snyk test -- --build-cache
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Examples of how you can use Maven arguments with the Snyk CLI
Test a specific Maven profile called “prod”.
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snyk test -- -prod
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Add a system property from your pom.xml file.
For example:
The package version appears in your pom.xml
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${pkg_version}
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Define the system property like this:
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snyk test -- -Dpkg_version=1.4
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CLI help for Gradle projects
Sub-projects
Gradle build can consist of several sub-projects, where each sub-project has its own build.gradle, while the root project is the only one that also includes a settings.gradle file. Sub-projects depend on the root project, but can be configured otherwise.
By default, Snyk CLI scans only the current project (the project in the root of the current folder), or the project that is specified by --file=path/to/build.gradle).
To scan all projects at once (recommended), use the --all-sub-projects flag:
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snyk test --all-sub-projects
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Note: Each of the individual sub-projects appears as a separate Snyk project in the UI.
To scan a specific project (for example, myapp):
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snyk test --sub-project=myapp
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Configurations
Gradle dependencies are declared for a particular scope, each scope is represented by Gradle with the help of Configurations. For example:
compileOnly configuration for development dependencies
compile configuration that includes compile and runtime dependencies
By default Snyk merges all configurations returned by Gradle to dependency graph based on the sum total of the dependencies across all configurations in the project/projects.
To test a specific configuration:
Use the --configuration-matching option with a Java regular expression (case-insensitive) as its parameter. The configuration that matches is then tested. If several configurations match, they are all merged and resolved together. For example: '^releaseRuntimeClasspath$|^compile#x27;
If the different sub-projects include different configurations, scan each sub-project separately.
Examples of how you can use the --configuration-matching:
--configuration-matching=compile will match compile, testCompile, compileOnly etc;
--configuration-matching=^compile$ will match only compile;
--configuration-matching='^(debug|release)compile#x27; will match debugCompile and releaseCompile
--configuration-matching='^(?!.*lintClassPath).*#x27; will match all configurations except lintClassPath
Android build variants
Android Gradle supports creating different versions of your app by configuring build variants.​
Since Snyk defaults to merging all available configurations the variants will result in a clash of un-mergeable configurations.
In such cases, Snyk scan fails with an error from Gradle which may contain one of the following messages:
Cannot choose between the following configurations of project :mymodulewithvariants
Cannot choose between the following variants of project :mymodulewithvariants
Could not select value from candidates
To avoid such conflicts:
Use a specific configuration(s): if you know of a build configuration that has all the required attributes and the configuration is identical across all sub-projects included in the test, specify that configuration.
For example:
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--configuration-matching=prodReleaseRuntimeClasspath
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Explicitly specify the dependency configuration: modify intra-project dependencies in your build.gradle file(s) to use a specific configuration
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  dependencies {
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      implementation project(path: ':mymodulewithvariants', configuration: 'default')
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  }
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Suggest configuration attributes: if you receive an error when running the command, the error may indicate which attribute values are available, while the error details from Gradle also indicate which dependency variants match which attributes. Using these details, add the attribute filter option.
For example:
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snyk test --configuration-attributes=buildtype:release,usage:java-runtime,mode:demo
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matches the variants using com.android.build.api.attributes.BuildTypeAttr=release and org.gradle.usage=java-runtime
Daemon
By default, Snyk passes gradle build --no-daemon in the background when running snyk test and snyk monitor. If for any reason, you run into trouble, try this:
1.Start the Gradle daemon.
2.Add --daemon to your snyk test or snyk monitor.
Lockfiles
If your Gradle project makes use of a single gradle.lockfile or multiple *.lockfile per configuration and you are having the following issue
Gradle Error (short): > Could not resolve all dependencies for configuration ':compileOnly'. > Locking strict mode: Configuration ':compileOnly' is locked but does not have lock state.
Bear in mind that compileOnly configuration has been deprecated and even if your project successfully generates a lockfile, it will not contain `compileOnly` state because this configuration cannot be resolved. Only resolvable configurations compute a dependency graph. In order to solve this issue we suggest you update your build.gradle containing dependencyLocking logic with the following instruction
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compileOnly {resolutionStrategy.deactivateDependencyLocking() }
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This will ignore compileOnly and save only the necessary information to analyse your project/projects.
Support
If you are having any trouble testing your Gradle projects with Snyk, collect the following details and send them to us at <[email protected]> so we can help you out:
build.gradle
settings.gradle (especially if we did not pick up a version of a package)
The output from the following commands:
$ snyk test -d
$ gradle dependencies -q
Git services for Maven projects
After you select a project for import, we build the dependency tree based on the pom.xml file.
Git services for Gradle projects
After you select a project for import, we build the dependency tree based on the build.gradle file and (optional) gradle.lockfile.
If a lockfile is present, Snyk will use it to accurately resolve the final version of dependencies used in the project.
Gradle lockfiles are an opt-in feature that, among other benefits, enable reproducible builds.Read more about Gradle dependency locking at https://docs.gradle.org/current/userguide/dependency_locking.html​
Kotlin: build.gradle.kts files are not currently supported in Git.
Git settings for Java
From the Snyk UI you can specify mirrors or repositories from which you’d like to resolve packages in Artifactory for Maven.
See the page below for more details on configuring the Artifactory integration.
Artifactory Registry for Maven
Additional Snyk support for Java
In addition to the CLI and Snyk UI features, you can also check your Java projects with these integrations.
Maven integration
Snyk for JavaScript
Snyk for .NET
Last modified 1d ago