Java How can I compile an entire directory structure of code

Question

The use case is simple  I got the source files that were created using Eclipse  So  there is a deep directory structure  where any Java class could be referring to another Java class in the same  child  sibling or parent folder    How do I compile this whole thing from the terminal using javac

User · Answer

Following is the method I found    1  Make a list of files with relative paths in a file  say FilesList txt  as follows  either space separated or line separated    foo AccessTestInterface java foo goo AccessTestInterfaceImpl java   2  Use the command   javac  FilesList txt -d classes   This will compile all the files and put the class files inside classes directory   Now easy way to create FilesList txt is this  Go to your source root directory   dir   java  s  b  gt  FilesList txt   But  this will populate absolute path  Using a text editor  Replace All  the path up to source directory  include   in the end  with     i e  empty string  and Save

User · Answer

Windows solution   Assuming all files contained in sub-directory  src   and you want to compile them to  bin    for  r src  i in    java  do javac  i -sourcepath src -d bin   If src contains a  java file immediately below it then this is faster  javac src    java -d bin

User · Answer

If all you want to do is run your main class  without compiling the  java files on which the main class doesn t depend   then you can do the following   cd  lt root-package-directory gt  javac  lt complete-path-to-main-class gt    or  javac -cp  lt root-package-directory gt   lt complete-path-to-main-class gt    javac would automatically resolve all the dependencies and compile all the dependencies as well

User · Answer

There is a way to do this without using a pipe character  which is convenient if you are forking a process from another programming language to do this   find  JAVA SRC DIR -name    java  -exec javac -d  OUTPUT DIR        Though if you are in Bash and or don t mind using a pipe  then you can do   find  JAVA SRC DIR -name    java    xargs javac -d  OUTPUT DIR

User · Answer

You d have to use something like Ant to do this hierarchically   http   ant apache org manual Tasks javac html  You ll need to create a build script with a target called compile containing the following    lt javac sourcepath    srcdir    src            destdir    build    gt       lt include name       java   gt   lt  javac gt    Then you  ll be able to compile all files by running    ant compile   Alternatively  import your project into Eclipse and it will automatically compile all the source files for that project

User · Answer

You have to know all the directories  or be able to use wildcard     javac dir1   java dir2   java dir3 dir4   java dir3 dir5   java dir6  src   java

User · Answer

The already existing answers seem to only concern oneself with the   java files themselves and not how to easily do it with library files that might be needed for the build   A nice one-line situation which recursively gets all   java files as well as includes   jar files necessary for building is   javac -cp    lib    -d bin   find   src     grep  java    Here the bin file is the destination of class files  lib  and potentially the current working directory  contain the library files and all the java files in the src directory and beneath are compiled

User · Answer

I would take Jon s suggestion and use Ant  since this is a pretty complex task   However  if you are determined to get it all in one line in the Terminal  on Linux you could use the find command  But I don t recommend this at all  since there s no guarantee that  say  Foo java will be compiled after Bar java  even though Foo uses Bar  An example would be   find   -type f -name    java  -exec javac        If all of your classes haven t been compiled yet  if there s one main harness or driver class  basically the one containing your main method   compiling that main class individually should compile most of project  even if they are in different folders  since Javac will try to the best of its abilities to resolve dependency issues

User · Answer

With Bash 4   you can just enable globstar shopt -s globstar  and then do javac      java

[java] Java: How can I compile an entire directory structure of code ?

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