No Method Error Java
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Java Nosuchmethoderror But Method Exists
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Java Lang Nosuchmethoderror At Runtime
up vote 21 down vote favorite I'm getting: NoSuchMethodError: com.foo.SomeService.doSmth()Z Am I understanding correctly that this 'Z' means that return type of doSmth() method is boolean? If true, then that kind of method really does not exist because this method returns some Collection. But on the other hand if I call this method, I'm not assigning its return value to any variable. I just nosuchmethoderror in java at runtime call this method like this: service.doSmth(); Any ideas why this error occurs? All necessary JAR files exist and all other methods from this class seems to exist. java nosuchmethoderror share|improve this question edited Feb 8 '14 at 12:03 Sam Rad 7,46352241 asked Sep 12 '10 at 15:19 vrm 65221224 2 Perhaps you're using it in a if/while? if( service.doSmth() ) ?? –OscarRyz Sep 12 '10 at 15:23 possible duplicate of How do I fix a NoSuchMethodError?, Interpreting java.lang.NoSuchMethodError message, etc. –Pascal Thivent Sep 12 '10 at 15:34 1 Although it is ages ago, I have to thank @OscarRyz for his answer. I did use such a method within a CollectionUtils.filter method, where my method returned the Predicate. Weird enough that I switched it back as it was and now it works, don't understand that actually .. –BAER Nov 19 '14 at 9:02 add a comment| 7 Answers 7 active oldest votes up vote 22 down vote accepted Looks like method exists in classpath during compilation, but not during running of your application. I don't think return type is a problem. If it was, it wouldn't compile. Co
Method java.lang Class NoSuchMethodError
Java Lang Nosuchmethoderror Init
java.lang.Object java.lang.Throwable java.lang.Error java.lang.LinkageError java.lang.IncompatibleClassChangeError java.lang.NoSuchMethodError All Implemented Interfaces: java.lang.nosuchmethoderror v Serializable public class NoSuchMethodError extends IncompatibleClassChangeError Thrown if an application tries to call a specified http://stackoverflow.com/questions/3695340/java-nosuchmethoderror method of a class (either static or instance), and that class no longer has a definition of that method. Normally, this error is caught by the compiler; this error https://docs.oracle.com/javase/7/docs/api/java/lang/NoSuchMethodError.html can only occur at run time if the definition of a class has incompatibly changed. Since: JDK1.0 See Also:Serialized Form Constructor Summary Constructors Constructor and Description NoSuchMethodError() Constructs a NoSuchMethodError with no detail message. NoSuchMethodError(Strings) Constructs a NoSuchMethodError with the specified detail message. Method Summary Methods inherited from classjava.lang.Throwable addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString Methods inherited from classjava.lang.Object http://craftingjava.blogspot.com/2012/07/javalangnosuchmethoderror.html method.To know the reason behind this read this post. When you try to invoke a method that is no longer available in a class then at the compile time itself you will be shown an error message "cannot find symbol". So you may think how come this error is thrown when launching a program or an application. I have explained the fact behind this issue using the following programs. Let's have a class method error Nomethodand Pro1as follows, Nomethod class: import java.util.*; class Nomethod { public static void main(String args[]) { Pro1 s=new Pro1(); s.display(); } } Pro1 class: class Pro1 { public void display() { System.out.println("I am inside display"); } } When you execute this program it will work fine without showing any errors.Now look at what happens when i change the class Pro1as follows and compile this class alone. Example1: class Pro1 { } Example2: class Pro1 no such method { public int void display() { System.out.println("I am inside display"); return 1; // for example i have included a statement like this } } Now if you execute the classNomethodwithout recompiling it then you will beembarrassedby this java.lang.NoSuchMethodError at run-time. 1. If you change the classPro1as shown inExample1,thenthis exception will be thrown because there is no method display()available in that class. 2. If you consider the Example2this error is thrown because the signature of the method display()has been changed. If you understand this examples then you might have understood the reason for this error thrown when executing a class that has no main() method. The real fact is that "binary compatibility with the pre-existing binaries(classes) have been compromised by the new binaries(modified classes)". "when you change the signature of a method or delete a method in a particular class"and compile it alone then other classes that invokes this method will have no idea about the state of the method,thus causing this error to be thrown at run-time. The same case applies to interfaces also,"if you try to change the signature of a method or delete a method in the interface" at that time also this exception will be thrown. What could be the solution for this? "If you have recompiled the other class, that invokes this modified method