Java “NoSuchMethodError”

Question

I\'m getting:

NoSuchMethodError: com.foo.SomeService.doSmth()Z

Am I understanding correctly that this \'Z\' means that return

Answer 1

Maybe still can help somebody, but this exception can happen also when you have on the classpath two classes in different jar files that have the same exact signature but they haven't the same public methods.

For example:

• On file mylibrary1.jar you have class com.mypackage.mysubpackage.MyClass with method doSmth()

• On file mylibrary2.jar you have class com.mypackage.mysubpackage.MyClass without method doSmth()

When searching the class, the classloader may find first mylibrary2.jar depending on the path precedence but can't find the method on that class.

Be sure you don't have the same package + class on two different files.