Duplicated files on classpath: draftv3/schema and draftv4/schema

[egore]

json-schema-validator ships two files named "draftv3/schema" and "draftv4/schema". The same two files are provided by json-schema-core which is a compile dependency of json-schema-validator.

When building on Android this is really problematic, because duplicated files cause errors.

:someapp:packageDebugError: duplicate files during packaging of APK C:\someapp\build\outputs\apk\someapp-debug-unaligned.apk
Path in archive: draftv4/schema
Origin 1: C:\.gradle\caches\modules-2\files-2.1\com.github.fge\json-schema-validator\2.2.5\6920bf9735d66f1da4493be0eae75cf855d0e56b\json-schema-validator-2.2.5.jar
Origin 2: C:\.gradle\caches\modules-2\files-2.1\com.github.fge\json-schema-core\1.2.4\579a8cd806ab23e0593e4c9bae4df30c99a6da23\json-schema-core-1.2.4.jar
You can ignore those files in your build.gradle:
android {
  packagingOptions {
    exclude 'draftv4/schema'
  }
}

I think it would be best to remove the copies from json-schema-validator and solely rely on json-schema-core providing them.

[samskiter]

I also have this issue. i can't compile with this....

[mplewis]

I am also running into this issue.

[Thalmann]

I also have this issue, does anyone have a temporary fix?

[egore]

As a temporary workaround I went ahead and removed the offending files from one the local JAR files.

[Thalmann]

This does only work if you only use the library which contains the draft4 and draft3 folders. If you need to use both libraries this is not possible because you now miss the removed folders in one of them.

[egore]

Not sure if I can follow you...

For the Java classloader it's unimportant which JAR file provided the files on the classpath. AFAIK it's even more true for Androids DEX files which are a result of all depended JAR files combined (which is the reason why the build system warns us developers).

[imminent]

By simply adding the validator dependency:
debugCompile('com.github.fge:json-schema-validator:2.2.6')
You get the core library as well, because it depends on the core library, so you don't have the option to not "use both libraries" @Thalmann .

[AdaiAndy]

for 2.2.8 version .in android project ,add follow can fix

packagingOptions {
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/NOTICE.txt'
    exclude 'draftv4/schema'
    exclude 'META-INF/ASL-2.0.txt'
    exclude 'META-INF/LICENSE'
    exclude 'draftv3/schema'
    exclude 'META-INF/LGPL-3.0.txt'
}