compilar e executar

package Compilar;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Method;

import javax.tools.JavaCompiler;
import javax.tools.ToolProvider;

public class Compilador implements ICompilador{

    @Override
    public String compilar(String codigo, String caminhoAplicacao , String nomeArquivo){

        FileOutputStream errorStream = null;

        try {

            salvaCodigo(codigo,caminhoAplicacao + "\\arquivos\\" + nomeArquivo );
            errorStream = new FileOutputStream(caminhoAplicacao+"\\erros.txt");

        } catch (FileNotFoundException e) {
            return "ERRO";
        } catch (IOException e) {
            return "ERRO";
        }

        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        compiler.run(null, null, errorStream, caminhoAplicacao + "\\arquivos\\" + nomeArquivo);

        try {
            return leArquivoErros(caminhoAplicacao + "\\erros.txt");
        } catch (IOException e) {
            return "ERRO";
        }
    }

    private String leArquivoErros(String caminho) throws IOException {
        BufferedReader leitor = new BufferedReader(new FileReader(caminho));
        String conteudo = leitor.readLine();
        String aux = "";
        while((aux = leitor.readLine()) != null){
            conteudo += "\n" + aux;
        }
        leitor.close();
        return conteudo;
    }

    @Override
    public void executar(String caminho) {
        try {
            Class h = Class.forName(caminho);
            Method [] metodos = h.getMethods();
            for(Method met : metodos){
                System.out.println(met.getName());
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        }
    }

    public void salvaCodigo( String conteudo , String caminho ) throws IOException{
        BufferedWriter saida = new BufferedWriter( new FileWriter(caminho));
        saida.write(conteudo);
        saida.close();
    }

}