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programmatically compiling a Java source file

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this simple snippet compiles a Java source file.

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  1. package ex.tajti.tools;
  2.  
  3. import javax.tools.Diagnostic;
  4. import javax.tools.DiagnosticListener;
  5. import javax.tools.JavaCompiler;
  6. import javax.tools.JavaFileObject;
  7. import javax.tools.StandardJavaFileManager;
  8. import javax.tools.ToolProvider;
  9.  
  10. /**
  11.  *
  12.  * @author ákos tajti
  13.  */
  14. public class Compiler {
  15.  
  16.     /**
  17.      * compiles a java source file with the given <code>fileName</code>
  18.      * 
  19.      * @param fileName
  20.      */
  21.     public void compile(String fileName) {
  22.         /*
  23.          * the compiler will send its messages to this listener
  24.          */
  25.         DiagnosticListener listener = new DiagnosticListener() {
  26.  
  27.             public void report(Diagnostic diagnostic) {
  28.                 System.err.println("gond: " + diagnostic.getMessage(null));
  29.                 System.err.println("sor: " + diagnostic.getLineNumber());
  30.                 System.err.println(diagnostic.getSource());
  31.             }
  32.         };
  33.  
  34.         //getting the compiler object
  35.         JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
  36.         StandardJavaFileManager manager = compiler.getStandardFileManager(null, null, null);
  37.         Iterable<? extends JavaFileObject> files = manager.getJavaFileObjects(fileName);
  38.         JavaCompiler.CompilationTask task = compiler.getTask(null, manager, listener, null, null, files);
  39.  
  40.         // the compilation occures here
  41.         task.call();
  42.     }
  43. }

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