java lang IllegalAccessError tried to access method

Question

I am getting an exception and I can t find the reason of it   The exception I get is       java lang IllegalAccessError  tried to access method Connected getData Ljava lang String  Ljava sql ResultSet  from class B   The method is public   public class B     public void myMethod          Connected conn   new Connected        create a connected class in order to connect to The DB     ResultSet rs   null      create a result set to get the query result    rs   conn getData sql      do sql query        public class Connected     public ResultSet getData String sql       ResultSet rs   null    try           prepareConnection         stmt   conn createStatement         stmt execute sql        rs   stmt getResultSet          catch  SQLException E               System out println  Content getData Error        E printStackTrace             return rs      i am using apache tomcat 5 5 12 and JAVA 1 6

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I was getting similar exception but at class level e g  Caused by  java lang IllegalAccessError  tried to access class      I fixed this by making my class public

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I was getting this error on a Spring Boot application where a  RestController ApplicationInfoResource had a nested class ApplicationInfo    It seems the Spring Boot Dev Tools was using a different class loader   The exception I was getting      2017-05-01 17 47 39 588  WARN 1516 ---  nio-8080-exec-9     m m a ExceptionHandlerExceptionResolver   Resolved exception caused   by Handler execution    org springframework web util NestedServletException  Handler dispatch   failed  nested exception is java lang IllegalAccessError  tried to   access class com gt web rest ApplicationInfo from class   com gt web rest ApplicationInfoResource  EnhancerBySpringCGLIB  59ce500c   Solution  I moved the nested class ApplicationInfo to a separate  java file and got rid of the problem

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In my case I was getting this error running my app in wildfly with the  ear deployed from eclipse  Because it was deployed from eclipse  the deployment folder did not contain an  ear file  but a folder representing it  and inside of it all the jars that would have been contained in the  ear file  like if the ear was unzipped   So I had in on jar    class MySuperClass     protected void mySuperMethod        And in another jar   class MyExtendingClass extends MySuperClass      class MyChildrenClass       public void doSomething        mySuperMethod                  The solution for this was adding a new method to MyExtendingClass   class MyExtendingClass extends MySuperClass      class MyChildrenClass       public void doSomething        mySuperMethod                  Override   protected void mySuperMethod         super mySuperMethod

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You are almost certainly using a different version of the class at runtime to the one you expect   In particular  the runtime class would be different to the one you ve compiled against  else this would have caused a compile-time error  - has that method ever been private   Do you have old versions of the classes jars on your system anywhere   As the javadocs for IllegalAccessError state      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    I d definitely look at your classpath and check whether it holds any surprises

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This happens when accessing a package scoped method of a class that is in the same package but is in a different jar and classloader     This was my source  but the link is now broken  Following is full text from google cache      Packages  as in package access  are scoped per ClassLoader       You state that the parent ClassLoader loads the interface and the child    ClassLoader loads the implementation  This won t work because of the    ClassLoader-specific nature of package scoping  The interface isn t visible to    the implementation class because  even though it s the same package name     they re in different ClassLoaders       I only skimmed the posts in this thread  but I think you ve already discovered    that this will work if you declare the interface to be public  It would also    work to have both interface and implementation loaded by the same ClassLoader       Really  if you expect arbitrary folks to implement the interface  which you    apparently do if the implementation is being loaded by a different    ClassLoader   then you should make the interface public       The ClassLoader-scoping of package scope  which applies to accessing package    methods  variables  etc   is similar to the general ClassLoader-scoping of    class names  For example  I can define two classes  both named com foo Bar     with entirely different implementation code if I define them in separate    ClassLoaders       Joel

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From Android perspective  Method not available in api version  I was getting this Issue primarily because i was using some thing that is not available deprecated in that Android version  Wrong way   Notification Builder nBuilder   new Notification Builder mContext   nBuilder addAction new Notification Action android R drawable ic menu view  PAUSE  pendingIntent      Right way   Notification Builder nBuilder   new Notification Builder mContext   nBuilder addAction android R drawable ic media pause  PAUSE  pendingIntent     here Notification Action is not available prior to API 20 and my min version was API 16

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I was getting same error because of configuration issue in intellij  As shown in screenshot  Main and test module was pointing to two different JDK   Press F12 on the intellij project to open module settings   Also all my dto s were using  lombok Builder which I changed it to  Data

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Just an addition to the solved answer   This COULD be a problem with Android Studio s Instant Run feature  for example  if you realized you forgot to add the line of code  finish   to your activity after opening another one  and you already re-opened the activity you shouldn t have reopened  which the finish   solved   then you add finish   and Instant Run occurs  then the app will crash since the logic has been broken      TL DR   This is not necessarily a code problem  just an Instant Run problem

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In my case the problem was that a method was defined in some Interface A as default  while its sub-class overrode it as private  Then when the method was called  the java Runtime realized it was calling a private method   I am still puzzled as to why the compiler didn t complain about the private override    public interface A        default void doStuff                 doing stuff           public class B        private void doStuff                 do other stuff instead           public static final main String    args        A someB   new B        someB doStuff

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This happened to me when I had a class in one jar trying to access a private method in a class from another jar   I simply changed the private method to public  recompiled and deployed  and it worked ok afterwards

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If getData is protected then try making it public  The problem could exist in JAVA 1 6 and be absent in 1 5x    I got this for your problem  Illegal access error

[java] java.lang.IllegalAccessError: tried to access method

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