java lang RuntimeException Uncompilable source code - what can cause this

Question

This error is just bizarre  my code compiles fine  I can see there are no problems with it  yet this error has just popped up  I have tried re-starting NetBeans and there is no additional exception information   What can cause this

User · Answer

Disable Deploy on Save in the Project s Properties Run screen   That s what worked for me finally   Why the hell NetBeans screws this up is beyond me   Note  I was able to compile the file it was complaining about using right-click in NetBeans   Apparently it wasn t really compiling it when I used Build  amp  Compile since that gave no errors at all   But then after that  the errors just moved to another java class file   I couldn t compile then since it was grayed out   I also tried deleting the build and dist directories in my NetBeans project files but that didn t help either

User · Answer

If it is Netbeans  try to uncheck  quot Compile on save quot  setting in the project properties  Build - gt  Compiling   This is the only thing which helped me in a similar situation

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change the package of classes  your files are probably in the wrong package  happened to me when I copied the code from a friend  it was the default package and mine was another  hence the netbeans could not compile because of it

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It s caused by NetBeans retaining some of the old source and or compiled code in its cache and not noticing that e g  some of the code s dependencies  i e  referenced packages  have changed  and that a proper refresh recompile of the file would be in order   The solution is to force that refresh by either   a  locating  amp  editing the offending source file to force its recompilation  e g  add a dummy line  save  remove it  save again   b  doing a clean build  sometimes will work  sometimes won t   c  disabling  Compile on save   not recommended  since it can make using the IDE a royal PITA   or d  simply remove NetBeans cache by hand  forcing the recompilation   As to how to remove the cache   If you re using an old version of NetBeans    delete everything related to your project in  netbeans 6 9 var cache index   replace 6 9 with your version     If you re using a newer one    delete everything related to your project in AppData Local NetBeans Cache 8 1 index   replace 8 1 with your version     The paths may vary a little e g  on different platforms  but the idea is still the same

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I also got the same error and I did clean build and it worked

User · Answer

I had the same issue with one of my netbeans project   Check whether you have correctly put the package name on all the classes  I got the same error message because i forgot to put the package name of a certain class  which was copied from another project

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I had this problem with NetBeans 8 0 1  Messages about problem in project deleted class  Deleting the    netbeans didn t work  Also I looked for ANY reference to the deleted class in ALL my projects  nothing found  I deleted the build classes  everything  Then  when I started Netbeans again  compile and magically appears the message in Run and into the mother compiled class  I tried the uncheck  Compile on save  Dime solution  and works  but it s not practical  Finally  my solution was edit and force recompile of the mother class  This way the new  class doesn t contains the message and Run works OK

User · Answer

If you are using Netbeans  try to hit the Clean and Build button  let it do the thing and try again  Worked for me

User · Answer

Implementing my own functional interfaces resolved this for me  so instead of using java util function   just create your own single-method interface with the parameters and return-type you want

User · Answer

Just check the packaging  the simplest answer I can provide is that your package has been mislabeled  within a class    Also  you may have some weird characters  Try white-flushing the code in a Notepad  or Gedit  and then pasting it into a newly created class with your IDE

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Add selenium-server-standalone-3 4 0 jar  It works to me   Download Link

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Recheck the package declarations in all your classes   This behaviour has been observed in NetBeans  when the package declaration in one of the classes of the package refers to a non-existent or wrong package  NetBeans normally detects and highlights this error but has been known to fail and misleadingly report the package as free of errors when this is not the case

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I had the same problem  My error was the packaging  So I would suggest you first check the package name and if the class is in the correct package

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Organize your code as a maven module  Once done run the command from terminal   mvn installl   to check  if your code builds fine  Finally import the project in netbeans or eclipse as maven project

User · Answer

I guess you are using an IDE  like Netbeans  which allows you to run the code even if certain classes are not compilable   During the application s runtime  if you access this class it would lead to this exception

[java] java.lang.RuntimeException: Uncompilable source code - what can cause this?

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