Solutions to the problem of Android studio pulling mpandroidchart always reporting gradle sync failed: could not download javassist.jar

The error that will be displayed in the Log log is org.gradle.internal.resolve.ArtifactResolveException:Could not download javassist.jar (org.javassist:javassist:3.20.0-GA);

solution:

build.gradle change  jcenter() to maven { url "http://jcenter.bintray.com" }

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