Eclipse AST not changing files which are not opened in eclipse

Question

I am trying to modify source code using eclipse plugin, JDT and AST (Abstract Syntax Tree). I can read all Java files and make operation on all those file, But when i am saving

Answer 1

Try to:

1. Apply the TextEdit directly to the ICompilationUnit instead of using Document.
2. Use ICompilationUnit.commitWorkingCopy to save the changes

I use code similar to this:

iCompilationUnit.becomeWorkingCopy(new NullProgressMonitor());
CompilationUnit cu = parse(iCompilationUnit);
ASTRewrite rewriter = ASTRewrite.create(cu.getAST());

... process AST ...

iCompilationUnit.applyTextEdit(rewrite.rewriteAST(), new NullProgressMonitor());
iCompilationUnit.commitWorkingCopy(false, new NullProgressMonitor());