NoSuchMethodError

Why This Happens

NoSuchMethodError means the JVM cannot find a method that the calling code was compiled against. This typically happens when you compile against one version of a library but run with a different version that removed or changed the method signature.

The Problem

// Compiled with library v2.0 that has doSomething()
// But running with library v1.0 that does not
import com.library.Helper;
Helper.doSomething(); // NoSuchMethodError

The Fix

// Ensure consistent dependency versions
// In pom.xml or build.gradle, align compile and runtime versions
// <dependency>
//   <groupId>com.library</groupId>
//   <artifactId>helper</artifactId>
//   <version>2.0</version> <!-- Same version at compile and runtime -->
// </dependency>

Step-by-Step Fix

1. 1

   Identify the missing method

   Read the error message for the full method signature. The format is ClassName.methodName(parameterTypes)returnType.

2. 2

   Check dependency versions

   Compare compile-time and runtime versions of the library. Use mvn dependency:tree or gradle dependencies to find version conflicts.

3. 3

   Align dependency versions

   Update your build configuration to use consistent versions. Exclude transitive dependencies that pull in wrong versions.