[Solved]-"exception in thread ""main"" java.lang.nosuchmethoderror: 'org.springframework.core.io.support.springfactoriesloader org.springframework.core.io.support.springfactoriesloader.fordefaultresourcelocation(java.lang.classloader)'"

Solution for NoSuchMethodError in Java

The error message "java.lang.NoSuchMethodError" typically occurs when your code tries to invoke a method that doesn't exist in the runtime classpath. This often happens due to version conflicts between libraries or incorrect usage of APIs.

Possible Causes:

• Version mismatch between Spring Framework libraries.
• Incorrect configuration or missing dependencies.
• Conflicting dependencies from different libraries.

Example:

Let's say you have a Spring Boot application that uses Spring Core. You might encounter this error if there's a discrepancy between the version of Spring Core expected by your code and the version actually available in your classpath.

Solution:

1. First, ensure that all your Spring Framework dependencies are aligned to the same version.
2. Check your project's dependencies and verify if there are any conflicts or missing dependencies.
3. Use dependency management tools like Maven or Gradle to manage your dependencies and ensure consistency.
4. If you're using Spring Boot, make sure you're not explicitly excluding any Spring modules that are required by your application.

Once you've addressed any version mismatches or dependency issues, rebuild your project and redeploy it to see if the error persists.

If you're using SpringToolSuite4, updating the version and then forcing the Maven Project update should resolve the issue: Project > Update Maven Project > Force Update of Snapshots/Releases.

Any time I encounter Method Not Found exceptions within frameworks (especially mature ones), the first step I take is to search for conflicting dependencies. Occasionally, two different libraries incorporate different versions of the same dependency, which, in my experience, frequently leads to this type of issue.

Managing dependencies may solve your problem. org.springframework.boot spring-boot-starter-parent 2.5.6

Cleanup your dependencies in your pom.xml. org.springframework.boot spring-boot-starter-data-jpa org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-security mysql mysql-connector-java runtime org.springframework.boot spring-boot-starter-test test Remove the spring-core dependencies, which probably are the culprit in the first place. Don't use tags when including starters, those are managed through the parent. Instead of separate Spring Security dependencies, use the spring-boot-starter-security instead. You also had duplicate mysql-connector-java dependencies.