Must Override a Superclass Method Errors after importing a project into Eclipse

Question

Anytime I have to re-import my projects into Eclipse  if I reinstalled Eclipse  or changed the location of the projects   almost all of my overridden methods are not formatted correctly  causing the error      The method must override a superclass method   It may be noteworthy to mention this is with Android projects for whatever reason  the method argument values are not always populated  so I have to manually populate them myself  For instance   list setOnCreateContextMenuListener new OnCreateContextMenuListener            These arguments have their correct names     public void onCreateContextMenu ContextMenu menu  View v                                       ContextMenuInfo menuInfo                                  will be initially populated like this   list setOnCreateContextMenuListener new OnCreateContextMenuListener            This methods arguments were not automatically provided         public void onCreateContextMenu ContextMenu arg1  View arg2                                      ContextMenuInfo arg3                 The odd thing is  if I remove my code  and have Eclipse automatically recreate the method  it uses the same argument names I already had  so I don t really know where the problem is  other then it auto-formatting the method for me   This becomes quite a pain having to manually recreate ALL my overridden methods by hand  If anyone can explain why this happens or how to fix it  I would be very happy   Maybe it is due to the way I am formatting the methods  which are inside an argument of another method

User · Answer

Fixing  must override a super class method error is not difficult  You just need to change Java source version to 1 6 because from Java 1 6  Override annotation can be used along with interface method  In order to change source version to 1 6 follow below steps     Select Project   Right click   Properties Select Java Compiler and check the check box  Enable project specific settings  Now make Compiler compliance level to 1 6 Apply changes

User · Answer

If nothing of the above helps  make sure you have a proper  Execution environment  selected  and not an  Alternate JRE    To be found under      Project -  Build Path -  Libraries   Select the JRE System Library and click Edit      If  Alternate JRE      is selected  change it to a fitting  Execution Environment  like JavaSE-1 8  jre1 8 0 60   No idea why  but this will solve it

User · Answer

In my case this problem happened when I imported a Maven project into Eclipse  To solve this  I added the following in pom xml    lt properties gt             lt maven compiler source gt 1 8 lt  maven compiler source gt      lt maven compiler target gt 1 8 lt  maven compiler target gt   lt  properties gt    Then in the context menu of the project  go to  Maven -  Update Project       and press OK   That s it  Hope this helps

User · Answer

With Eclipse Galileo you go to Eclipse -  Preferences menu item  then select Java and Compiler in the dialog   Now it still may show compiler compliance level at 1 6  yet you still see this problem   So now select the link  Configure Project Specific Settings     and in there you ll see the project is set to 1 5  now change this to 1 6   You ll need to do this for all affected projects   This byzantine menu   dialog interface is typical of Eclipse s poor UI design

User · Answer

In my case  none the solutions above works  I have to checkout my source code to another folder  From eclipse select File   Switch workSpaces   Other    and then import code to the new workspaces  it works after that

User · Answer

The answer by Paul worked for me partially  I still had one error then  So  in addition to that  I also had to go to Properties-  Project Facets and there set the Java version from 1 5 to 1 6   Maybe that helps

User · Answer

This happens when your maven project uses different Compiler Compliance level and Eclipse IDE uses different Compiler Compliance level  In order to fix this we need to change the Compiler Compliance level of Maven project to the level IDE uses   1  To See Java Compiler Compliance level uses in Eclipse IDE      Window -  Preferences -  Compiler -  Compiler Compliance level   1 8  or 1 7  1 6    ect    2  To Change Java Compiler Compliance level of Maven project     Go to   Project  -    Properties  -  Select  Java Compiler  -  Change the Compiler Compliance level   1 8  or 1 7  1 6    ect

User · Answer

To resolve this issue   Go to your Project properties -  Java compiler -  Select compiler compliance level to 1 6-  Apply

User · Answer

Guys in my case none of the solutions above worked   I had to delete the files within the Project workspace     project  classpath   And the folder     settings   Then I copied the ones from a similar project that was working before  This managed to fix my broken project   Of course do not use this method before trying the previous alternatives

User · Answer

In case this happens to anyone else who tried both alphazero and Paul s method and still didn t work    For me  eclipse somehow  cached  the compile errors even after doing a Project   Clean     I had to uncheck Project   Build Automatically  then do a Project   Clean  and then build again   Also  when in doubt  try restarting Eclipse  This can fix a lot of awkward  unexplainable errors

User · Answer

Eclipse is defaulting to Java 1 5 and you have classes implementing interface methods  which in Java 1 6 can be annotated with  Override  but in Java 1 5 can only be applied to methods overriding a superclass method    Go to your project IDE preferences and set the Java compiler level to 1 6 and also make sure you select JRE 1 6 to execute your program from Eclipse

User · Answer

It s 2020 - Project gt Right Click gt Java Compiler gt Compiler Compliance Level gt  Change this to 1 8  or latest level

User · Answer

This is my second time encounter this problem  first time according the alphazero s recommendation it worked  but in the second time I set to 1 6 it don t work it just like  CACHE  this error after clean and rebuild   Try to switch off  Build Automatically  as Rollin s said -  error still here   So I removed the problem project  already set to 1 6  from Package Explorer and import it again -  it start a rebuild and no error this time  Hope this help someone

[java] 'Must Override a Superclass Method' Errors after importing a project into Eclipse

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