gradle exclude duplicate class

you as a library author should not have to decide which logging implementation your consumers use in the end.

Since you don’t need these duplicate files in your application, the simplest way of doing is to tell the build system to exclude the files altogether. For example, imagine that your project B strictly depends on C:1.0. Select View > Tool Windows > Gradle (or click Gradle in the tool windows bar). Some projects might need to divert from the default behavior and enforce an earlier version of a dependency e.g. For example, here we use the setSimpleProperty() method to modify properties defined by setters in the Person class, which works fine.

Let’s say a project uses the HttpClient library for performing HTTP calls.

The concept is simple, In a Gradle build, you are not allowed to include a file more than once with the same path. This dependency is called transitive dependency.

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gradle exclude duplicate class

It is more often that you see DuplicateFileException: Duplicate files copied in APK META-INF/.. errors in the Gradle build system. If you are developing a library, you have to be aware that this information is not published, and so sometimes an exclude can be the better alternative. Exclusions are spelled out as a key/value pair via the attributes group and/or module as shown in the example below.

This can be seen as implicitly defining a feature variant that has not been explicitly declared by commons-beanutils itself. Once you do figure it correctly, you can easily solve them by simply writing in the order in which things need to be included. Your email address will not be published. Exclude for more fine-grained control. Join the DZone community and get the full member experience. You can unsubscribe at any time. For example, B might say, instead of strictly 1.0, that it strictly depends on the [1.0, 2.0[ range, but prefers 1.0. Gradle Shadow Plugin The library author's dependency toolkit User Guide → John Engelman - … For more information about managing dependencies in Gradle, see Dependency management basics in the Gradle User Guide. For example archive tasks also implements this interface. On the upside, Gradle’s exclude handling is, in contrast to Maven, taking the whole dependency graph into account.

warn : shows a warning on the console, but the last duplicate file 'wins' like with the include strategy.

In the directories src/manual and src/website we have a file COPY.txt. Also, make sure that you’re not duplicating the dependencies. 0, you used the Gradle plugin, gradle-appengine-plugin, to generate an API Discovery Document. conflicting strict dependencies will trigger a build failure that you have to resolve. In practice, larger libraries or frameworks can bring in a huge set of dependencies. if the source code of the project depends on an older API of a dependency than some of the external libraries.

Since the set doesnot support duplicate entries, you will get only unique elements left with TreeSet. For example, If you were using two jars which contain common META-INF files, then you are duplicating the META-INF files. For example, the first copy of the class file will be considered by the build system and will be used, and the subsequent same class files appearing for the second time are ignored. If we would attempt to set a property not existing on the class, we should get an error like Unknown property on class Person. For example, If you were using two jars which contain common META-INF files, then you are duplicating the META-INF files.

So as a conclusion Gradle build is so strict in handling duplicate resources, and you should avoid such duplications. It can be hard to figure out why you ended up with these errors and where you did that. When it happens without you knowing it’s indeed a creepy topic. This is only an example to illustrate potential pitfalls. 0-alpha1) and classes. forced dependencies suffer an ordering issue which can be hard to diagnose and will not work well together with other rich version constraints. In this case, if this information is not known to Gradle, it is recommended to add the missing capability information via component metadata rules as described in the declaring component capabilities section. The biggest of them is the subtle errors. However, for consumers, strict versions are still considered globally during graph resolution and may trigger an error if the consumer disagrees. Since you don’t need these duplicate files in your application, the simplest way of doing is to tell the build system to exclude the files altogether. We must use the setDuplicatesStrategymethod to configure how Gradle behaves. By entering your email, you agree to our Terms and Privacy Policy, including receipt of emails. Similar as forcing a version of a dependency, excluding a dependency completely requires a conscious decision. To avoid such duplication, comment out those duplicate lines. In particular, a strict version will override any other strict version on the same module found transitively. Zeplin is an awesome desktop application that can be used as a tool for collaboration…, As of now, Android Studio needs a fast and stable internet connection to implement a…, In the previous post, you have seen how to install Eclipse IDE, ADT, and the Android…, Your email address will not be published. If we still want to have commons-collections excluded, because our combined usage of commons-beanutils and opencsv does not need it, we need to exclude it from the transitive dependencies of opencsv as well. Thus the same file, when included more than once, makes a duplicate error. if the source code of the project depends on an older API of a dependency than some of the external libraries. Moving Layout from Zeplin to Android Studio, Use gradle zip in local system without downloading it everytime using gradle-wrapper, Android Application Development Lesson – 2 – Environmental Variables, Solved – Cannot resolve symbol Android Studio. Strict dependencies are to some extent similar to Maven’s nearest first strategy, but there are subtle differences: strict dependencies don’t suffer an ordering problem: they are applied transitively to the subgraph, and it doesn’t matter in which order dependencies are declared. Using strict versions, you will effectively depend on the version you declare, even if a transitive dependency says otherwise. Now, a consumer, A, depends on both B and C:1.1.

Gradle Goodness: Handle Copying Duplicate Files, Developer howto fix: tell gradle to exclude org. Since Gradle has no first-class support for Maven BOMs, you can use Spring’s Dependency management plugin. Excluding a transitive dependency for multiple dependency declaration, Declaring Dependencies between Subprojects, Understanding Configuration and Execution, Understanding Library and Application Differences, Producing and Consuming Variants of Libraries, Modeling Feature Variants and Optional Dependencies, Overriding transitive dependency versions, it’s better to express the requirement in terms of a, Forced dependencies vs strict dependencies, ResolutionStrategy.force(java.lang.Object[]), Resolving mutually exclusive dependency conflicts. The following build file create four task of type Copy, each with a different duplicate strategy. Marketing Blog. Then if a consumer chooses 1.1 (or any other version in the range), the build will no longer fail (constraints are resolved). In our code, shown below, we only use one method from the beanutils library, PropertyUtils.setSimpleProperty().

The content is simply a text line respectively COPY from src/manual and COPY from src/website: We can now invoke the four tasks and see how Gradle reacts: Published at DZone with permission of Hubert Klein Ikkink, DZone MVB.

For example, if we add opencsv as another dependency to our project above, which also depends on commons-beanutils, commons-collection is no longer excluded as opencsv itself does not exclude it. After Gradle executes the task, the Run window should open to display the output. 0-milestone-9 does not include debug information about local variables. However, the risk of breaking an untested code path increased by doing this. Gradle script downloads the JAR from maven central or any other location which we specify. This also happens because of the duplicate class files. Over a million developers have joined DZone.

If you use excludes, make sure that you do not utilise any code path requiring the excluded dependency by sufficient test coverage. Actually we can configure how duplicate files are handled by any task that implements the CopySpec interface. I.e. Save my name, email, and website in this browser for the next time I comment.

You should prefer strict versions instead. Required fields are marked *. Expand AppName > Tasks > android and double-click androidDependencies. Forcing dependencies via ExternalDependency.setForce(boolean) is deprecated and no longer recommended: In all situations, this is best expressed saying that your code strictly depends on a version of a transitive. The scenario can be like 1. Few other build systems are more lenient compared to the Gradle build system. Solved – DuplicateFileException: Duplicate files copied in APK META-INF/.. // compile files('libs/httpmime-4.3.5.jar'), 'org.x.x.x:org.x.x.x.x.org.apache.http.client:4.x.x', "org.apache.httpcomponents:httpcore:4.x.x", "org.apache.httpcomponents:httpmime:4.x.x", 'org.apache.httpcomponents:httpmime:4.x.x'.

you as a library author should not have to decide which logging implementation your consumers use in the end.

Since you don’t need these duplicate files in your application, the simplest way of doing is to tell the build system to exclude the files altogether. For example, imagine that your project B strictly depends on C:1.0. Select View > Tool Windows > Gradle (or click Gradle in the tool windows bar). Some projects might need to divert from the default behavior and enforce an earlier version of a dependency e.g. For example, here we use the setSimpleProperty() method to modify properties defined by setters in the Person class, which works fine.

Let’s say a project uses the HttpClient library for performing HTTP calls.

The concept is simple, In a Gradle build, you are not allowed to include a file more than once with the same path. This dependency is called transitive dependency.

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