Eclipse插件：ITypebinding在ASTParser中获取NULL值

Question

我已将 BindingsRecovery 的值设置为true parser.setBindingsRecovery（true）; ，但问题仍然存在。这段代码可能有什么问题？

public void correctParser(IProject project) throws IOException, CoreException
{
    File[] FileFolderInSrc = new File(project.getFile("src").getLocation().toString() + "//").listFiles();
    ArrayList<File> JavaFiles = new ArrayList<File>();
    findJavaFiles(FileFolderInSrc, JavaFiles);
    //IPackageFragment[] packages = JavaCore.create(srcFolder).getPackageFragments();
    File file = new File("C:\\Users\\XYZ\\com.myplugin.rmp\\filename.txt");
    StringBuilder str = new StringBuilder("");

    for (final File curFile : JavaFiles)
    {
        IWorkspace workspace= ResourcesPlugin.getWorkspace();    
        IPath location= Path.fromOSString(curFile.getAbsolutePath()); 
        IFile ifile= workspace.getRoot().getFileForLocation(location);

        InputStream CheckCurJavaFile = (ifile).getContents();
        BufferedReader CheckCurJavaFileReader = new BufferedReader(new InputStreamReader(CheckCurJavaFile));
        String curline = null;
        while ((curline = CheckCurJavaFileReader.readLine()) != null)
        {
            str.append(curline + "\n");
        }
        CheckCurJavaFileReader.close();
    }    
    ASTParser parser = ASTParser.newParser(AST.JLS4);
    parser.setSource(str.toString().toCharArray());
    parser.setResolveBindings(true);

    IJavaProject targetProject=null;
    if (project.hasNature(JavaCore.NATURE_ID))
    {
        targetProject = JavaCore.create(project);
    }

    parser.setProject(targetProject);
    parser.setKind(ASTParser.K_COMPILATION_UNIT);
    parser.setBindingsRecovery(true);

    final FileWriter fw = new FileWriter(file.getAbsoluteFile());
    final CompilationUnit cu = (CompilationUnit) parser.createAST(null);
    final BufferedWriter bw = new BufferedWriter(fw);

    try
    {
        cu.accept(new ASTVisitor()
        {
            Set<String> names = new HashSet<String>();

            public boolean visit(MethodDeclaration node)
            {
                //if (node.getName().getIdentifier().equals("testSearch")) { //if starts
                Block block = node.getBody();
                block.accept(new ASTVisitor()
                {
                    public boolean visit(MethodInvocation node)
                    {
                        SimpleName name = node.getName();
                        try
                        {
                            bw.write("Name '"+ node.getName()+ "" + "' at line"+cu.getLineNumber(name.getStartPosition()) + "\n");
                            Expression expression = node.getExpression();
                            if (expression != null)
                            {
                                bw.write("Expr: " + expression.toString() + "\n");
                                ITypeBinding typeBinding = expression.resolveTypeBinding();
                                //IType type = (IType)typeBinding.getJavaElement();
                                //bw.write("Type " +  type.getFullyQualifiedName());
                               // System.out.printf("Type %s (method %s) calls %s\n", typeName, methodName, type.getFullyQualifiedName());
                                if (typeBinding != null)
                                {
                                    bw.write("Type: " + typeBinding.getName() + "\n");
                                }
                            }

                            IMethodBinding binding = node.resolveMethodBinding();
                            if (binding != null)
                            {
                                ITypeBinding type = binding.getDeclaringClass();
                                if (type != null)
                                {
                                    bw.write("Decl: " + type.getName() + "\n");
                                }
                            }
                            return true;

                        }
                        catch (IOException e)
                        {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        return false;
                    }
                });
                return true;
            }
        });
    }//try brace

    finally
    {
        try
        {
            bw.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}