nosuchmethoderror

问题 New Java programmers often encounter these messages when they attempt to run a Java program. Error: Main method not found in class MyClass, please define the main method as: public static void main(String[] args) or a JavaFX application class must extend javafx.application.Application Error: Main method is not static in class MyClass, please define the main method as: public static void main(String[] args) Error: Main method must return a value of type void in class MyClass, please define the

问题 The common problems when building and deploying Spark applications are: java.lang.ClassNotFoundException . object x is not a member of package y compilation errors. java.lang.NoSuchMethodError How these can be resolved? 回答1: Apache Spark's classpath is built dynamically (to accommodate per-application user code) which makes it vulnerable to such issues. @user7337271's answer is correct, but there are some more concerns, depending on the cluster manager ("master") you're using. First, a Spark

问题 I\'m getting a NoSuchMethodError error when running my Java program. What\'s wrong and how do I fix it? 回答1: Without any more information it is difficult to pinpoint the problem, but the root cause is that you most likely have compiled a class against a different version of the class that is missing a method, than the one you are using when running it. Look at the stack trace ... If the exception appears when calling a method on an object in a library, you are most likely using separate