How do I fix a NoSuchMethodError

Question

I m getting a NoSuchMethodError error when running my Java program   What s wrong and how do I fix it

User · Answer

Just adding to existing answers  I was facing this issue with tomcat in eclipse  I had changed one class and did following steps    Cleaned and built the project in eclpise mvn clean install Restarted tomcat   Still I was facing same error  Then I cleaned tomcat  cleaned tomcat working directory and restarted server and my issue is gone   Hope this helps someone

User · Answer

One such instance where this error occurs  I happened to make a silly mistake of accessing private static member variables in a non static method  Changing the method to static solved the problem

User · Answer

For me it happened because I changed argument type in function  from Object a  to String a  I could resolve it with clean and build again

User · Answer

It means the respective method is not present in the class     If you are using jar then decompile and check if the respective version of jar have proper class   Check if you have compiled proper class from your source

User · Answer

Try this way  remove all  class files under your project directories  and  of course  all subdirectories   Rebuild   Sometimes mvn clean  if you are using maven  does not clean  class files manually created by javac  And those old files contain old signatures  leading to NoSuchMethodError

User · Answer

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 versions of the library when compiling and running  Make sure you have the right version both places   If the exception appears when calling a method on objects instantiated by classes you made  then your build process seems to be faulty  Make sure the class files that you are actually running are updated when you compile

User · Answer

If your file name is different than the class name which contain main method then it may be the possibility that this error may cause

User · Answer

I ve encountered this error too   My problem was that I ve changed a method s signature  something like  void invest Currency money         into   void invest Euro money         This method was invoked from a context similar to  public static void main String args          Bank myBank   new Bank         Euro capital   new Euro        myBank invest capital       The compiler was silent with regard to warnings  errors  as capital is both Currency as well as Euro   The problem appeared due to the fact that I only compiled the class in which the method was defined - Bank  but not the class from which the method is being called from  which contains the main   method   This issue is not something you might encounter too often  as most frequently the project is rebuilt mannually or a Build action is triggered automatically  instead of just compiling the one modified class   My usecase was that I generated a  jar file which was to be used as a hotfix  that did not contain the App class as this was not modified  It made sense to me not to include it as I kept the initial argument s base class trough inheritance   The thing is  when you compile a class  the resulting bytecode is kind of static  in other words  it s a hard-reference   The original disassembled bytecode  generated with the javap tool  looks like this     7   Methodref           2  22            Bank invest  LCurrency  V   After the ClassLoader loads the new compiled Bank class  it will not find such a method  it appears as if it was removed and not changed  thus the named error   Hope this helps

User · Answer

Most of the times java lang NoSuchMethodError is caught be compiler but sometimes it can occur at runtime  If this error occurs at runtime then the only reason could be the change in the class structure that made it incompatible    Best Explanation  https   www journaldev com 14538 java-lang-nosuchmethoderror

User · Answer

To answer the original question  According to java docs here       NoSuchMethodError  Thrown if an application tries to call a specified 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 can only occur at run time if the definition of a class has incompatibly changed     If it happens in the run time  check the class containing the method is in class path  Check if you have added new version of JAR and the method is compatible

User · Answer

I ve had the same problem  This is also caused when there is an ambiguity in classes  My program was trying to invoke a method which was present in two JAR files present in the same location   class path  Delete one JAR file or execute your code such that only one JAR file is used  Check that you are not using same JAR or different versions of the same JAR that contain the same class      DISP E EXCEPTION  step      Z-JAVA-105  Java exception java lang NoSuchMethodError com example yourmethod

User · Answer

I had faced the same issue  I changed the return type of one method and ran the test code of that one class  That is when I faced this NoSuchMethodError  As a solution  I ran the maven builds on the entire repository once  before running the test code again  The issue got resolved in the next single test run

User · Answer

I fixed this problem in Eclipse by renaming a Junit test file  In my Eclipse work space I have an App project and a Test project  The Test project has the App project as a required project on the build path     Started getting the NoSuchMethodError  Then I realized the class in the Test project had the same name as the class in the App project     App      src       com example           Projection java Test      src       com example         Projection java   After renaming the Test to the correct name  ProjectionTest java  the exception went away

User · Answer

I was having your problem  and this is how I fixed it   The following steps are a working way to add a library   I had done the first two steps right  but I hadn t done the last one by dragging the   jar  file direct from the file system into the  lib  folder on my eclipse project   Additionally  I had to remove the previous version of the library from both the build path and the  lib  folder   Step 1 - Add  jar to build path    Step 2 - Associate sources and javadocs  optional     Step 3 - Actually drag  jar file into  lib  folder  not optional

User · Answer

Above answer explains very well   just to add one thing If you are using using eclipse use ctrl shift T and enter package structure of class  e g    gateway smpp PDUEventListener    you will find all jars projects where it s present  Remove unnecessary jars from classpath or add above in class path  Now it will pick up correct one

User · Answer

I had the same error     Exception in thread  main  java lang NoSuchMethodError  com fasterxml jackson core JsonGenerator writeStartObject Ljava lang Object  V         at com fasterxml jackson databind ser BeanSerializer serialize BeanSerializer java 151          at com fasterxml jackson databind ser DefaultSerializerProvider serializeValue DefaultSerializerProvider java 292          at com fasterxml jackson databind ObjectMapper  configAndWriteValue ObjectMapper java 3681          at com fasterxml jackson databind ObjectMapper writeValueAsString ObjectMapper java 3057    To solve it I checked  firstly  Module Dependency Diagram  click in your POM the combination - gt  Ctrl Alt Shift U or right click in your POM - gt  Maven - gt  Show dependencies  to understand where exactly was the conflict between libraries  Intelij IDEA   In my particular case  I had different versions of Jackson dependencies      1  So  I added directly in my POM of the project explicitly the highest version - 2 8 7 of these two   In properties    lt jackson version gt 2 8 7 lt  jackson version gt    And as dependency    lt dependency gt       lt groupId gt com fasterxml jackson core lt  groupId gt       lt artifactId gt jackson-databind lt  artifactId gt       lt version gt   jackson version  lt  version gt   lt  dependency gt    2  But also it can be solved using Dependency Exclusions   By the same principle as below in example      lt dependency gt         lt groupId gt group-a lt  groupId gt         lt artifactId gt artifact-a lt  artifactId gt         lt version gt 1 0 lt  version gt             lt exclusions gt                lt exclusion gt                   lt groupId gt com fasterxml jackson core lt  groupId gt                   lt artifactId gt jackson-databind lt  artifactId gt                lt  exclusion gt            lt  exclusions gt     lt  dependency gt    Dependency with unwanted version will be excluded from your project

User · Answer

I have just solved this error by restarting my Eclipse and run the applcation  The reason for my case may because I replace my source files without closing my project or Eclipse  Which caused different version of classes I was using

User · Answer

I had a similar problem with my Gradle Project using Intelij  I solved it by deleting the  gradle  see screenshot below  Package and rebuilding the Project   gradle Package

User · Answer

I ran into similar issue   Caused by  java lang NoSuchMethodError  com abc Employee getEmpId  I   Finally I identified the root cause was changing the data type of variable     Employee java --  Contains the variable  EmpId  whose Data Type has been changed from int to String  ReportGeneration java --  Retrieves the value using the getter  getEmpId      We are supposed to rebundle the jar by including only the modified classes  As there was no change in ReportGeneration java I was only including the Employee class in Jar file  I had to include the ReportGeneration class file in the jar to solve the issue

User · Answer

This can also be the result of using reflection   If you have code that reflects on a class and extracts a method by name  eg  with Class getDeclaredMethod  someMethodName           then any time that method name changes  such as during a refactor  you will need to remember to update the parameters to the reflection method to match the new method signature  or the getDeclaredMethod call will throw a NoSuchMethodException   If this is the reason  then the stack trace should show the point that the reflection method is invoked  and you ll just need to update the parameters to match the actual method signature     In my experience  this comes up occasionally when unit testing private methods fields  and using a TestUtilities class to extract fields for test verification    Generally with legacy code that wasn t designed with unit testing in mind

User · Answer

These problems are caused by the use of the same object at the same two classes  Objects used does not contain new method has been added that the new object class contains   ex   filenotnull  DayMoreConfig conf 16-07-2015 05 02 10 ussdgw-1  Open TCP IP connection to SMSC  10 149 96 66 at 2775 16-07-2015 05 02 10 ussdgw-1  Bind request   bindreq   pdu  0 9 0  1   900 900 GEN 52  addrrang  0 0 2000     Exception in thread  main  java lang NoSuchMethodError  gateway smpp PDUEventListener  lt init gt  Lgateway smpp USSDClient  V         at gateway smpp USSDClient bind USSDClient java 139          at gateway USSDGW initSmppConnection USSDGW java 274          at gateway USSDGW  lt init gt  USSDGW java 184          at com vinaphone app ttn USSDDayMore main USSDDayMore java 40   -bash-3 00     These problems are caused by the concomitant 02 similar class  1 in src  1 in jar file here is gateway jar

User · Answer

NoSuchMethodError   I have spend couple of hours fixing this issue  finally fixed it by just renaming package name   clean and build     Try clean build first if it doesn t works try renaming the class name or package name and clean build   it should be fixed  Good luck

User · Answer

The problem in my case was having two versions of the same library in the build path  The older version of the library didn t have the function  and newer one did

User · Answer

If using Maven or another framework  and you get this error almost randomly  try a clean install like    clean install  This is especially likely to work if you wrote the object and you know it has the method

User · Answer

Why anybody doesn t mention dependency conflicts  This common problem can be related to included dependency jars with different versions  Detailed explanation and solution  https   dzone com articles solving-dependency-conflicts-in-maven Short answer  Add this maven dependency   lt plugin gt   lt groupId gt org apache maven plugins lt  groupId gt   lt artifactId gt maven-enforcer-plugin lt  artifactId gt   lt version gt 3 0 0-M3 lt  version gt   lt configuration gt       lt rules gt           lt dependencyConvergence   gt       lt  rules gt   lt  configuration gt   lt  plugin gt    Then run this command  mvn enforcer enforce  Maybe this is the cause your the issue you faced

User · Answer

In my case I had a multi module project and scenario was like com xyz TestClass was in module A and as well as in module B and module A was dependent on module B  So while creating a assembly jar I think only one version of class was retained if that doesn t have the invoked method then I was getting NoSuchMethodError runtime exception  but compilation was fine   Related   https   reflectoring io nosuchmethod

User · Answer

This is usually caused when using a build system like Apache Ant that only compiles java files when the java file is newer than the class file   If a method signature changes and classes were using the old version things may not be compiled correctly   The usual fix is to do a full rebuild  usually  ant clean  then  ant       Sometimes this can also be caused when compiling against one version of a library but running against a different version

User · Answer

I ran into a similar problem when I was changing method signatures in my application   Cleaning and rebuilding my project resolved the  NoSuchMethodError

User · Answer

If you are writing a webapp  ensure that you don t have conflicting versions of a jar in your container s global library directory and also in your app  You may not necessarily know which jar is being used by the classloader   e g      tomcat common lib mywebapp WEB-INF lib

User · Answer

Note that in the case of reflection  you get an NoSuchMethodException  while with non-reflective code  you get NoSuchMethodError  I tend to go looking in very different places when confronted with one versus the other

User · Answer

If you have access to change the JVM parameters  adding verbose output should allow you to see what classes are being loaded from which JAR files   java -verbose class  lt other args gt    When your program is run  the JVM should dump to standard out information such as                Loaded junit framework Assert from file  C  Program 20Files junit3 8 2 junit jar

[java] How do I fix a NoSuchMethodError?

Examples related to java

Examples related to nosuchmethoderror