The NoSuchMethodError is thrown when the JVM tries to call a method that doesn't exist in the loaded class. This typically happens due to JAR version conflicts "” the code was compiled against one version of a library but a different (incompatible) version is on the classpath at runtime.
# Check for conflicting dependencies
mvn dependency:tree | grep "commons-lang"
# Exclude conflicting transitive dependency
# Then do a clean build
mvn clean install
# Or in Gradle
gradle dependencies | grep "commons-lang"<!-- Your code uses commons-lang3 3.12 -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
<!-- But some-library pulls in commons-lang3 3.1 (older!) -->
<dependency>
<groupId>com.example</groupId>
<artifactId>some-library</artifactId>
<version>1.0</version>
<!-- Transitively brings commons-lang3:3.1 -->
</dependency><!-- Exclude the old version from the transitive dependency -->
<dependency>
<groupId>com.example</groupId>
<artifactId>some-library</artifactId>
<version>1.0</version>
<exclusions>
<exclusion>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- Or use dependencyManagement to force a version -->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
</dependencies>
</dependencyManagement>// build.gradle "” force specific version
configurations.all {
resolutionStrategy {
force 'org.apache.commons:commons-lang3:3.12.0'
}
}
// Or exclude from specific dependency
implementation('com.example:some-library:1.0') {
exclude group: 'org.apache.commons', module: 'commons-lang3'
}# Maven clean build
mvn clean install
# Gradle clean build
./gradlew clean build
# Clear local Maven repository cache for the problematic artifact
rm -rf ~/.m2/repository/org/apache/commons/commons-lang3/NoSuchMethodError is a runtime error from binary incompatibility (JAR conflicts). NoSuchMethodException is a checked exception from reflection when a method doesn't exist in the class.
Run mvn dependency:tree and search for the library name. Look for multiple versions. Use mvn dependency:analyze to find unused and missing dependencies.
A BOM is a special POM that defines compatible versions of a set of libraries. Spring Boot BOM, for example, ensures all Spring components use compatible versions. Import it in dependencyManagement.
Yes, if you compile with Java 17 but run with Java 8, methods added in Java 9+ won't exist. Always ensure your runtime JDK version matches or exceeds your compile target.
Run mvn dependency:tree in CI to detect conflicts. Use dependency locking (Gradle) or dependencyManagement (Maven). Run integration tests that exercise all library interactions.
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