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Gradle Build Sync Failed Fix

DodaTech Updated 2026-06-24 3 min read

In this tutorial, you'll learn about Gradle Build Sync Failed Fix. We cover key concepts, practical examples, and best practices.

Your Gradle project fails to sync with Could not resolve all artifacts, Could not find method, or Gradle sync failed — the build script has syntax errors, repositories are unreachable, or dependencies cannot be resolved.

Step-by-Step Fix

1. Check the Gradle distribution URL

# gradle/wrapper/gradle-wrapper.properties
# Wrong: non-existent or old Gradle distribution URL
distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip

# Right: use a valid, newer Gradle version
distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-all.zip

2. Fix repository configuration

// build.gradle (project-level)
// Wrong: missing or incorrect repositories
buildscript {
    repositories {
        jcenter()  // JCenter is deprecated and read-only
    }
}

// Right: use mavenCentral and google repositories
buildscript {
    repositories {
        google()
        mavenCentral()
        maven { url 'https://jitpack.io' }  // For JitPack dependencies
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
        maven { url 'https://jitpack.io' }
    }
}

3. Fix proxy settings

# If behind a corporate proxy, configure Gradle proxy settings

# Create gradle.properties in project or ~/.gradle/
# Wrong: no proxy configuration
# Right: configure proxy
systemProp.http.proxyHost=proxy.company.com
systemProp.http.proxyPort=8080
systemProp.http.proxyUser=username
systemProp.http.proxyPassword=password
systemProp.https.proxyHost=proxy.company.com
systemProp.https.proxyPort=8080
systemProp.https.proxyUser=username
systemProp.https.proxyPassword=password

4. Fix Gradle JVM settings

# gradle.properties
# Wrong: insufficient JVM memory
org.gradle.jvmargs=-Xmx512m

# Right: increase JVM memory for large projects
org.gradle.jvmargs=-Xmx2048m -XX:MaxMetaspaceSize=512m
org.gradle.parallel=true
org.gradle.caching=true
org.gradle.daemon=true

5. Fix dependency declarations

// app/build.gradle
// Wrong: using deprecated or incorrect dependency syntax
dependencies {
    compile 'com.squareup.okhttp3:okhttp:4.12.0'  // compile is deprecated
}

// Right: use modern dependency configurations
dependencies {
    implementation 'com.squareup.okhttp3:okhttp:4.12.0'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
}

6. Clear Gradle cache

# Wrong: trying to sync without clearing corrupt cache
# Right: clear the Gradle cache and re-download dependencies

# Stop all Gradle daemons
./gradlew --stop
# or
killall -9 java 2>/dev/null || true

# Clear the Gradle cache
rm -rf ~/.gradle/caches/
rm -rf ~/.gradle/wrapper/dists/

# Delete project-level build artifacts
rm -rf .gradle/
rm -rf build/

7. Regenerate the Gradle wrapper

# Generate a fresh Gradle wrapper
gradle wrapper --gradle-version 8.5

# Or download the wrapper manually
# Go to https://services.gradle.org/distributions/ and download gradle-8.5-all.zip
# Extract it to your system and verify:
gradle --version

8. Sync from command line

# Run a clean build from the command line
./gradlew clean build --refresh-dependencies

# Expected output on success:
# BUILD SUCCESSFUL in 2m 15s
# 89 actionable tasks: 89 executed

Prevention

  • Always use mavenCentral() or google() instead of the deprecated jcenter().
  • Keep the Gradle wrapper updated to the latest stable version.
  • Clear the Gradle cache periodically (rm -rf ~/.gradle/caches/).
  • Use a gradle.properties file with increased JVM memory for large projects.
  • Configure proxy settings in ~/.gradle/gradle.properties for corporate environments.

Common Mistakes with build sync

  1. Using foldl instead of foldl' causing stack overflow on large lists
  2. Forgetting deriving (Show, Eq) on custom data types needed for debugging
  3. Placing the wildcard pattern first in case expressions, making all subsequent patterns unreachable

These mistakes appear frequently in real-world GRADLE code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

What is the Gradle wrapper and why is it needed?

The Gradle wrapper (gradlew) ensures every developer uses the same Gradle version. It downloads the specified Gradle distribution automatically, eliminating "works on my machine" issues. |||How do I update the Gradle version? Change the distributionUrl in gradle/wrapper/gradle-wrapper.properties and run ./gradlew wrapper. This downloads the new Gradle version and updates the wrapper scripts. |||What does "Could not resolve all artifacts" mean? Gradle could not download one or more dependencies from the configured repositories. Check the repository URLs, network connectivity, proxy settings, and the dependency coordinates (group:name:version).

← Previous How to Fix Gradle Build Failed Errors Next → Gradle Daemon Out of Memory Fix

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