Intellij IDEA Java classes not auto compiling on save

Question

Yesterday I switched to IntelliJ IDEA from Eclipse    I am using JRebel with WebSphere Server 7 as well   Everything now seems to be working somewhat fine  except that when I modify a Java file  and hit save  IntelliJ does not re-compile the file  in order for JRebel to pick it up    The Eclipse  Build Automatically  feature resolved this issue    In IntelliJ IDEA  I have to hit CTRL SHIFT 9 to re-compile the relevant class for JRebel to pick it up  If changes are done across two files  I have to do this on each and one of them and since IntelliJ uses the save all mechanism  its pretty hard to know what to recompile manually which I am not really interested in doing either   Isn t there a way to make IntelliJ to do this on its own

User · Answer

WARNING  Eclipse Mode plug-in is obsolete and is not compatible with the recent IDEA 12  builds  If you install it  IDE will hang on every file change and will respond extremely slow     IntelliJ IDEA doesn t use automatic build  it detects errors on the fly  not via compiler  Similar to Eclipse mode will be available in IDEA 12     Use Build   Make  it invokes the incremental make process that will compile only changed and dependent files  it s very fast    There is also a FAQ entry that may help   Update on the automatic make feature  When run debug configuration is running  Make project automatically has no effect  Classes on disk will change only on Build   Make  It s the core design decision as in our opinion class changes on disk should be always under user s control  Automatic make is not the copycat of Eclipse feature  it works differently and it s main purpose is to save time waiting for the classes to be ready when they are really needed  before running the app or tests   Automatic make doesn t replace the explicit compilation that you still need to trigger like in the case described in this question  If you are looking for different behavior  EclipseMode plug-in linked in the FAQ above would be a better choice

User · Answer

Please follow these steps carefully to enable it    1  create Spring Boot project with SB V1 3 and add  Devtools   1   to dependencies   2  invoke Help- Find Action    and type  Registry   in the dialog search for  automake  and enable the entry  compiler automake allow when app running   close dialog  3  enable background compilation in Settings- Build  Execution  Deployment- Compiler  Make project automatically   4  open Spring Boot run config  you should get warning message if everything is configured correctly  5  Run your app  change your classes on-the-fly  Please report your experiences and problems as comments to this issue   click here for more info

User · Answer

I had the same issue  I was using the  Power save mode   which prevents from compiling incrementally and showing compilation errors

User · Answer

I had the same issue  I think it would be appropriate to check whether your class can be compiled or not  Click recompile  Ctrl Shift F9 by default   If its not working then you have to investigate why it isn t compiling   In my case the code wasn t autocompiling because there were hidden errors with compilation  they weren t shown in logs anywhere and maven clean-install was working   The rootcause was incorrect Project Structure -  Modules configuration  so Intellij Idea wasn t able to build it according to this configuration

User · Answer

I was getting error  some jars are not in classpath So I just delete the corrupted jar and perrform below steps  1 Project  gt   Setting gt Build Execution Deployment gt Compiler gt check build project automatically 2 CTRL SHIFT A find search   registry   --Check for below param compiler automake allow when app running compiler automake trigger delay 500---According to ur requirement 3 Add devtool in pom xml           lt dependency gt               lt groupId gt org springframework boot lt  groupId gt               lt artifactId gt spring-boot-devtools lt  artifactId gt               lt optional gt true lt  optional gt           lt  dependency gt  4 Build  If found any probelm while building  saying some jar in not in class path Just delete the corrupted jar and re-build the project angain after sync with maven lib

User · Answer

You can keymap ctrl s to save AND compile in one step   Go to the keymap settings and search for Compile

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Not enough points to comment on an existing answer  but similar to some people above  I wound up just adding a macro  amp  keymap to Organize Imports   Format   SaveAll   FastReload F9    Synchronize   The synchronize is added as it seems to be the only way I can also see updates in resources modified by external build tools   watchers  i e   webpack    The process is slower than eclipse - and for the external file refresh often have to run the command multiple times - but suppose I can live with it

User · Answer

Use the Reformat and Compile plugin  inspired by the Save Actions plugin of Alexandre DuBreuil    https   plugins jetbrains com plugin 8231 pr idea ce  At the moment I am only offering a jar file  but this is the most important part of the code   private final static Set lt Document gt  documentsToProcess   new HashSet lt Document gt     private static VirtualFile   fileToCompile   VirtualFile EMPTY ARRAY      The plugin extends FileDocumentManagerAdapter     beforeDocumentSaving calls reformatAndCompile private static void reformatAndCompile           NotNull final Project project           NotNull final Document document           NotNull final PsiFile psiFile        documentsToProcess add document       if  storage isEnabled Action compileFile   amp  amp  isDocumentActive project  document             fileToCompile   isFileCompilable project  psiFile getVirtualFile               ApplicationManager getApplication   invokeLater new Runnable              Override         public void run                 if  documentsToProcess contains document                     documentsToProcess remove document                   if  storage isEnabled Action optimizeImports                             storage isEnabled Action reformatCode                         CommandProcessor getInstance   runUndoTransparentAction new Runnable                              Override                         public void run                                 if  storage isEnabled Action optimizeImports                                     new OptimizeImportsProcessor project  psiFile                                       run                                                              if  storage isEnabled Action reformatCode                                     new ReformatCodeProcessor                                          project                                          psiFile                                          null                                          ChangeListManager                                              getInstance project                                               getChange psiFile getVirtualFile       null                                                   run                                                              ApplicationManager getApplication   runWriteAction new Runnable                                      Override                                 public void run                                         CodeInsightUtilCore forcePsiPostprocessAndRestoreElement psiFile                                                                                                                                                                    if  fileToCompile length  gt  0                    if  documentsToProcess isEmpty                          compileFile project  fileToCompile                       fileToCompile   VirtualFile EMPTY ARRAY                                  else if  storage isEnabled Action makeProject                     if  documentsToProcess isEmpty                          makeProject project                                   else                   saveFile project  document  psiFile getVirtualFile                                    project getDisposed        private static void makeProject  NotNull final Project project        ApplicationManager getApplication   invokeLater new Runnable              Override         public void run                 CompilerManager getInstance project  make null                    project getDisposed        private static void compileFile           NotNull final Project project           NotNull final VirtualFile   files        ApplicationManager getApplication   invokeLater new Runnable              Override         public void run                 CompilerManager getInstance project  compile files  null                    project getDisposed        private static void saveFile           NotNull final Project project           NotNull final Document document           NotNull final VirtualFile file        ApplicationManager getApplication   invokeLater new Runnable              Override         public void run                 final FileDocumentManager fileDocumentManager   FileDocumentManager getInstance                if  fileDocumentManager isFileModified file                     fileDocumentManager saveDocument document                                  project getDisposed

User · Answer

I managed to solve this using macros   I started recording a macro    Click Edit - Macros - Start macro recording Click File - Save All Click Build - Make Project Click Edit - Macros - Stop macro recording   Name it something useful like   SaveAndMake    Now just remove the Save all keybinding  and add the same keybinding to your macro    So now  every time i save  it saves and makes a dirty compile  and jRebel now detects all changes correctly

User · Answer

i had same issue and also a problem file icon in intellij  so i removed the  idea folder and re import project solved my issue

User · Answer

It was not working for me due to having an unnecessary module in my project structure  The tests were executed using the other module  I suppose    I don t know how it ended up like that but removing it solved the problem   Make sure your Run Debug settings are using the module you are building with the autosave   E g    see the module in     You can change the modules in Project Structure - Modules

User · Answer

I ended up recording a Macro to save and compile in one step  and keymap Ctrl s to it

User · Answer

UPDATED  For IntelliJ IDEA 12  releases we can build automatically the edited sources if we are using the external compiler option  The only thing needed is to check the option  Build project automatically   located under  Compiler  settings     Also  if you would like to hot deploy  while the application is running or if you are using spring boot devtools you should enable the compiler automake allow when app running from registry too  This will automatically compile your changes    Using Ctrl Shift A  or   Shift A on Mac  type Registry once the registry windows is open  locate and enable compiler automake allow when app running  see here      For versions older than 12  you can use the EclipseMode plugin to make IDEA automatically compile the saved files   For more tips see the  Migrating From Eclipse to IntelliJ IDEA  guide

User · Answer

Intellij fails quietly when it encounters compile problem in other module  and then automatic build is not performed  So check your Problems window

User · Answer

There is actually no difference as both require 1 click    Eclipse  manual Save  auto-compile   IntelliJ  auto Save  manual compile    Simplest solution is just to get used to it  Because when you spend most of your daytime in your IDE  then better have fast habits in one than slow habits in several of them

User · Answer

The only thing that worked for me in my maven project that was affected by this is to add a  test-compile  goal to the run configuration of my unit tests  Incredibly clumsy solution  but it works

User · Answer

Edit your Run Debug Configuration so that Build option is selected before launching    After Build option is selected    The above solution worked for me while working on my JBehave test suite

User · Answer

Please follow both steps  1 - Enable Automake from the compiler  Press  ctrl   shift   A  For Mac     shift   A  Type  make project automatically Hit  Enter Enable Make Project automatically feature  2 - Enable Automake when the application is running  Press  ctrl   shift   A  For Mac     shift   A  Type  Registry Find the key compiler automake allow when app running and enable it or click the checkbox next to it  Note  Restart your application now    Note  This should also allow live reload with spring boot devtools

[java] Intellij IDEA Java classes not auto compiling on save

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